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Tips and Hints on the repair of Television Receivers


Amstrad

Akura/Hinari

Blaupunkt

Cascade

Bush

Curtis Mathes

Daewoo

Emerson

Ferguson

Fisher

General Faults

RCA/GE

Grundig (Minerva)

Hitachi

Kaisui

JVC

Magnavox

Mitsubishi

MGA

Nap

Nordmende

Panasonic

Philips

Pioneer

Portland

Pye

Quasar

Royal

Sanyo

Samsung

Sharp

Sony

Sylvania

Symphonic/related other brands

Thomson / related brands

Toshiba

Zenith

Amstrad VCR/TV Combo's

Model TVR1 (Combined TV VCR)

See the Video tips for further faults on this unit

Set Dead Fuse F604 Blown

Check for S\C in 5v Regulator Q603 and primary side components.

Tip kindly supplied by "John Andrews"

Model TVR2 (Combined TV VCR)

See the Video tips for further faults on this unit

Dead No Power

Check resistor R1501 if ok check STK7348 regulator chip and for dry joints in lopt.

Tip kindly supplied by "John Andrews"

No tuning.

Tuning problems. Check chips MN1220, 14DN233A, 14DN379.

Tip kindly supplied by "John Andrews"

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Akura/Hinari TV's

Akura cx30/Hinari ct17

No sound-very faint

R059 o/c 8.2k

Tip kindly supplied by "John Porter" Ireland

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Blaupunkt TV's

Tiptronic

Shot down and vertical troubleshooting

Replace TDA4600 and V630 TDA1170 and R450 1 ohm 1/4w and R630 10 ohm 1/4w

Tip kindly supplied by "Luis Ferreira" Portugal

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Cascade TV's

TV510

No power

12 volt zener + 10 ohm 1 watt gone caused by c909/ c910

Tip kindly supplied by "John Porter" Ireland

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Bush TV's

1427t

r/g/b one colour gone

12 ohm 1 watt resistor o/c on tube base panel

Tip kindly supplied by "John Porter" Ireland

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Curtis Mathes TV's

CMC85

Have four broken lines about 3/4 up on screen that are stationary. Two top are colored bottom two are white. Can see through to picture. V-hold adjustment moves out of screen then it creeps back down to same spot.

Change the vert.sw. there's a problem and they go bad

Tip kindly supplied by "John Williamson" Wintervilles OH

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Daewoo TV's

DCB2016F

Vertical line in center of screen no picture

Resolder C320 capacitor near flyback transformer

Tip kindly supplied by "Weavers Electronics" Oak Harbor, Ohio

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Emerson TV's

All with TA7644 IC

Looses color when brightness is reduced.

Replace TA7644 IC

Tip kindly supplied by "Woodie" Tullahoma, TN

TC1351

Buzzing sound from inside set after warmup.

Yoke was vibrating, I used electric armature spray sealant to re-set it.

Tip kindly supplied by "DANS TV SERVICE" Madison, WV

ECR162

Dark picture

Replace open R301 (150K Ohm) in brightness limiter circuit. Located near flyback.

Tip kindly supplied by "Woodie" Tullahoma, TN

ECR214

No power, just clicks

I tried the caps (C448 +C434) near SCR (D508) and the SCR driver (IC501). It was a leaky capacitor (C507) 100uF160V. CLUE: The set would not start up at 115VAC, but would at 90VAC.

Tip kindly supplied by "California" Riverside

VTO950

Dead Set

Resolder cold connections at SW-502 & Relay (RY-101)

Tip kindly supplied by "Lee Lewis"

VT1320

Intermittent Power

Resolder cold connections in power supply, at R-506, R508 & R-513

Tip kindly supplied by "Lee Lewis"

VT1320

Timer will not hold memory

Replace IC-8001.

Tip kindly supplied by "Lee Lewis"

VT1320V

Picture jitters (Shakes)

Repair/replace back tension arm assembly

Tip kindly supplied by "Lee Lewis"

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RCA/GE TV's

See also the articles by William S. Arnold CTC169 or CTC177

Channels go in & out intermittently, loud popping & static also

Remove shield from Tuner Assy., re-solder ALL pads connected to plug pins! (visibly cracked usually)

Tip kindly supplied by "John R. Wallace"

Newer 13" Models

Unit is dead

Replace diodes DP18, DP19 & DP20 around the flyback transformer, even if they test ok.

Tip kindly supplied by "Russ Villard"

CTC97H

Vertical retrace lines-replacing Q3020 does not cure problem. Replacing the (2)220k ohm resistors in the vert. circuit does not cure it either.

The PC board under Q3020 is mismarked on some models. The layout actually puts the transistor in backwards. Circuit trace the electrical connections and you will see that the transistor must be installed physically backwards for it to work properly

Tip kindly supplied by "Richard Gray" New Orleans

CTC117C

Reduced vertical with foldover (top)

Replace R502 (4.7 megohm resistor to pin 20 of IC400)

Tip kindly supplied by "Richard Gray" New Orleans

CTC121E

Intermittent negative picture

L606 (peaking coil) intermittant open

Tip kindly supplied by "Richard Gray" New Orleans

CTC130

Dead set, bad Horiz. out transistor, tick tick then low HV,Horiz. out transistor overheating. R426 (4.7K ohm) resistor damaged causing low B+ to horiz. driver transistor

Replace resistor

Tip kindly supplied by "Richard Gray" New Orleans

CTC 139 Chasis

No Power, Fuse OK

Probable open 3.9 ohm 5 watt resistor in the power supply. If this is open replace the .29uf cap in the vicinity. To check this condition unplug the yoke. The set should power up.

Tip kindly supplied by "Dan Little" N. Myrtle Beach S.C.

CTC140

Pix. flashing...long term intermittent, may oper. perfectly for hours.

Monitor U2300-7 for fluctuating voltage, suspect L2307.

Tip kindly supplied by "Johnnie Peyton" Bonaire Ga.

CTC145/146

Intermittent on/off (one second intervals) with green screen and retrace lines.

CR3104 (5.6 volt zener diode) was open causing 5 volt standby to rise to 8 volts, removing the reset to the microprocessor. changing this diode remedied problem.

Tip kindly supplied by "Richard Gray" New Orleans

CTC157C Chassis

Bright Pix. with retrace lines. Video output collectors down to 5-7V.

Q2901 leaky [Luminance buffer] have seen this several times, part won't test bad on meter using "diode" test.

Tip kindly supplied by "Marvin Brown, John Eye Service" Beckley WV.

CTC175 or CTC177

See also an Article by William S. Arnold

Dead

Shorted C4406

Tip kindly supplied by "bob's tv" worcester,ma usa

No Audio or Audio won't increase at all

Remove Q404 on bottom of board, this part is not needed at all

Tip kindly supplied by "Joe Weber"

Low or No Audio

Replace or remove Q1903 (Not Q404) mute transistor.

Tip kindly supplied by "JOE " J&J ELECTRONICS N.J.

No or Low Audio

Replace EEprom, it is necessary to reprogram the settings of the new eeprom. If possible record the old settings from the original.

Tip kindly supplied by "Marlin Johnson" Carmichael, Ca

Low audio volume display to maximum

Replace eeprom U3201, copy values before replacing and then set for new eeprom, do not remove Q404/ transistor mutes audio on channel change and power up

Tip kindly supplied by "James Bailey" Link-Watson Corp.

Pic put in from top to bottom

Resolder pin 5 on flyback to new ground

Tip kindly supplied by "John Williamson" Winterville OH

Very little audio

Defective EEPROM - Before replacing, solder tuner sheild grounds per other tip and record EEPROM settings - see service manual

Tip kindly supplied by "Ron" Indiana

One color missing

Check wavefoms at t-chip may look good replace microprocessor u3101 then do chassis alignment

Tip kindly supplied by "James Bailey" Link-Watson Corp.

Dead set

Surface mount cap on the bottom of tuner shield (common problem) resolder. The shield breaks the cap loose from the board

Tip kindly supplied by "Wesley" Danville, VA

No Audio

Replace diode CR4704 PN# 207878. Also check (and replace if necessary) R4702 and R4517. Also check (and replace if necessary) U4501 (Vertical IC).

Tip kindly supplied by "Pro Electronics" West Palm Beach, Florida

Won't turn on and power supply looks fine

Probably someone entered the service mode and lowered the horizontal frequency. One way to turn on the set to gain access to the service mode would be to lower the line voltage. Hopefully it wasn't lowered to zero even though the set shuts off at a higher value (6-9)

Dead set

The best thing for RCA chassis is to change the eeprom. Try to get eeprom that is already programmed. This saves a lot of time, other wise you have to program the set. Make sure that you get the right eeprom because you won`t get all of the menu. Make sure you double check eeprom. You can get the setting off one that is working or go to teckweb. so double check the eeprom.

Tip kindly supplied by "John" Bloomongdale ohio

There is a lot of problems that the eeprom cause. From snowy pic audio to shinking.

OK first thing to do is resolder tuner sheild there are about 21 spots, if this helps go. Then some time you can get power up take the safety cap put another cap on top of this one will let you power up. Then get into menu write all info down, change hoz. setting to 11 this should let the set power up, remove the extra safety cap. Then make sure to change eeprom. Hope this helps some.

Tip kindly supplied by "John" Ohio

Vertical shrinkage with snowy pix intermittent.

Remove tuner shield (tuner built into main board) and resolder all ground connections.

Tip kindly supplied by "Ron's Electronics" Whitefield, ME

All CTC175 Series

Vertical foldover, shutdown, loss of tuning and/or audio and generally all other strange symtoms.

Remove lower tuner shield & resolder all major connections. Double check your soldering. Make sure you have good solder joints, do the same with shield.

If you still have problems change eeprom. If it's not fixed yet start trouble shooting.

Tip kindly supplied by "Danny H. Phillips" VCR Repair Plus Royston,GA

 

CTC175-CTC178

Lots bad pic. dead, audio shinks

The first thing to do on all of the CTC175 up is resolder the tuner if does not help change eeprom if set is working write down all the numbers in set up.

Tip kindly supplied by "John Williamson" Bloomingdale Ohio

CTC177

Will not tune, tap chassis, set may work for short time

Ferrite bead FB4111 cracked, this is supply line for run 12 volt run to tuner circuit

Tip kindly supplied by "James Bailey" Link-Watson Corp. Danville, Va.

OSD shifted partially off screen

Check for defective or incorrect EPROM installed.

Tip kindly supplied by "Johnnie Peyton" Bonaire Ga.

Newer models CTC175 /up

When replacing eproms on newer RCA&GE tv's check to see if programmed ic's are avaiable for the origional part # this will save lots of time & trouble [not all available]

Tip kindly supplied by "bob's tv" worcester,ma usa

CTC175K

No video only snow on screen

Need to replace surface mounted IC on surface (board mounted tuner)

Tip kindly supplied by "David Rivera" Turks and Caicos Islands

CTC177AF

Dead

R4001, U4101, CR4106, Line fuse

Tip kindly supplied by "Bob's TV" Worcester, MA USA

CTC177/187

Bad Color. One color missing or smeared to right.

Usually the problem, is a faulty "T" Chip, U1001. LA7610. If this does not remedy the problem suspect the CRT.

Low neg vert line

Replace U3101 micro

Tip kindly supplied by "Dennis McManis" Atlanta Ga

Bad pincussion, picture may be stretched

CR4403 part #164589, also check C4407 for open .047 at 400v cap.

Dead set (you change shorted CR4704 & open resistor R4702 the set plays but you have a slight vert roll at the bottom of the screen, when channel change.

Change R4517 it opens or loses value. Anytime you change R4702 for a dead-set also change R4517.

Tip kindly supplied by "BFRYE" Columbia,S.C.

RCA CTC176,177,186,187 Prior to serial No. starting with 505...

Black screen, good audio

After repairing the tuner grounds, change the eeprom. It's locked in the composite video 'on' command, but audio is still in tuner mode.

Tip kindly supplied by "Terry Holland" Oak Harbor , Wa

CTC187

Starts up shuts off and cycles on and off

Replace regulator I.C. U4101

Tip kindly supplied by "James Bailey" Danville, Virginia

CTC187BJ

When first on, narrow all sides width/hight vary with picture change

C4407 .047/400v, *CR4403 p/n 164589

*tests good REPLACE

Tip kindly supplied by "Bob's TV" Worcester, ma USA

RCA CTC146E

Immediate shut-down

Replace defective CR3104

Tip kindly supplied by "Electronic Ser. Co. of Danville" Danville, Va. 24540

CTC146l

No channel 2-3 or 4 all others work fine

Change U501 RCA part # 195946 located inside tuner.

Tip kindly supplied by "oscar l ramos" miami florida

TX 825 Chassis

Dead or intermittent startup

Look around transistor "TP15" (on this set this is a transistor location #) usually has been hot & scoarched PC board, replace TP15.

Tip kindly supplied by "Marvin Brown John Eye Service" Beckley WV.

RCA Model TX826

Intermitant powers on, once on, seems to play without interruption.

Replace TP15 with same or ECG123AP transistor.

Tip kindly supplied by "Wayne Doganieri" All-Tronics Video and Audio, Cinnaminson, NJ

Takes about 2 or 3 seconds to come on after power is pushed

Change CP63 from 47ufd to 4.7ufd

X13144GSFO3 - CH.TX-82

Dead set

Replace CR-14

Tip kindly supplied by "Lee Lewis"

X13144GSFO3

Dead set

Shorted DP-18 & Open RP-68

Tip kindly supplied by "Lee Lewis"

No picture

Replace open RV-127

Tip kindly supplied by "Lee Lewis"

RCA Model TX86

Tuner Inoperative

This is caused by the 33 V Supply missing at pin 4 of tuner, Cap C1503 shorted "NOTE remove the cap and DO NOT reinstall."

Tip kindly supplied by "Electronic Ser. Co. of Danville, Danville, Va. 24540"

CTC166

Dead Set

Replace shorted standby filter cap C4506 located right behind standby transformer

Tip kindly supplied by "Dan" Chesapeake, Va

CTC169 chassis

See also an Article by William S. Arnold

A "V" Shaped area appears on the screen during dark scenes.

Install factory add-on shield kit, part#226701 on the horiontal output heatsink.

Tip kindly supplied by "William S. Arnold" Stockton, CA USA

Vertical line in center of screen.

C4403 50ufd @ 250v. Part #197518

Tip kindly supplied by "Tony's TV" Ocala, Florida

CTC 169 and above

Dead or severe pincusinon distortion

Replace pin damper diode and associated cap. Usually a .056 or close in value. Cap may appear swelled. Also, hot may be shorted.

25 THRU 35 INCH CTC169

Dead set, blown fuse

Replace chopper output transistor Q4101 and always replace IC U4101 check snubber circuit for proper damping action and replace current sense resistors off the emmiter circuit off Q4101, check H-output transistor also.

Tip kindly supplied by "John Takach" Fairless Hills, PA.

CTC169/F27888T

No start squealing

C4401 changed from .015uf to .009uf change capacitor it is in horizontal output circuit

Tip kindly supplied by "James Bailey" Link-Watson Corporation, Danville Va.

CTC169L/F26071

Dead, remove back found and replaced open fuse. Still dead.

Check R4001 15 watt 2.7 ohm resistor. If open suspect Q4101 (shorted). Part#200165.

Tip kindly supplied by "William S. Arnold" Stockton, CA USA

Dead. Replaced open fuse. Unit still dead.

It is possible that the Regulator IC at U4001 could have been damaged and may need to be replace (part#200419).

Tip kindly supplied by "William S. Arnold" Stockton, CA USA

CTC169PTV and DV

Red raster on channel change (retrace)

Replace luma buffer Q2301

Tip kindly supplied by "Dennis McManis" Atlanta Ga

RCA F31672ET

Bullet shaped shadow in picture.

Replace U1001 t-chip IC

Tip kindly supplied by "WEAVERS ELECTRONICS" Oak Harbor, Ohio

ColorTrak 27" FPRZ22TR

Loses Remote functions after about 10 minutes, same with replacement remote.

First check with the customer to see if the unit is too close to fluorescent or halogen lighting. This will affect remote performance. Also check for loose connections in the tuner control board (MST001A)

 Tip kindly supplied by "William S. Arnold" Stockton, CA USA

FPR720WR

Loud sound for about 15 min, then goes to normal.

Solder loose plug connections on the tuner control module MTT001A.

Tip kindly supplied by "William Arnold" Stockton, CA USA

All With MTT Tuner control

Intermittent Remote control

Resolder Tuner Control Module Connections to remote receiver cable.

Tip kindly supplied by "Woodie" Tullahoma, Tennessee

GJR2028T

Normal color picture overpowered by excessive brightness with visable retrace lines.

Look for a shorted video amp transistor

Tip kindly supplied by "Mike Jenks" ANchorage AK

PS35680

Dead. Set trys tp power up then immediately shuts down. Green light on front momentarily lights.

Exercise extreme caution while testing this and any chassis. Usually the High Voltage Splitter (Focus Divider network). Shorts internally. There are two wires going to the second anode (Discharge HV First!!) Unplug each wire from each other and hook up HV probe to the HV lead, not the Focus anode, Then plug ac into wall and try. If unit comes on and off three times (cycles) replace splitter. If unit comes on with sound and no raster replace splitter. Hope this helps. This is one of the most difficult models to work on.

Tip kindly supplied by "William S. Arnold" Stockton, CA USA

General Electric 13GP415F01

Power relay toggles indefinitely when powered up or when main board is flexed.

Resolder T401 in horiz. output section.

Tip kindly supplied by "Tom Oliver"

25GT522

No raster, turning up screen control revealed no vertical sweep.

CR4704(shorted), R4702U(3.3 OHM, 2W).

Tip kindly supplied by "DANS TV SERVICE" Madison, WV

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Grundig TV's

T 55-440

Doesn't work

Replace IC631 TDA4605, T644 IRFBC30 with BUZ90A, C633 100uF/50V

Tip kindly supplied by "Luis Ferreira" Portugal

T56-220 M

No FOCUS and down side of screen are closed

Replace Tripler K536 with HR Diemen type HRT904-02 and IC TDA3654

Tip kindly supplied by "Luis Ferreira" Portugal

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Hitachi TV's

27AX3B

Dead

Shorted D710(part#2348511) and an open AC fuse F901(Part#2315411)

Tip kindly supplied by "William S. Arnold" Stockton, CA USA

27CX5B and such Chassis

Shuts down. Have to unplug and plug back in to get it on again. Continues to have this problem.

Add a capacitor (.47mfd @ 50v) across R302 with positive side going to the Flyback Transformer.

Tip kindly supplied by "Marlin Johnson" Carmichael, Ca

46UX10BF (Projection & Others)

Probloms with PIP, Vert rolls, brightness & other.

There is a repair kit available from Hitachi to repair the PIP board. Part# X480125

Tip kindly supplied by "Dean Renz" Vacaville, Ca

CPT2176

No sound or vision - set "ticking"

Replace line output transformer

Tip kindly supplied by "Kevin Henry" Brighton UK

CT1912A

Picture missing vertically from top to mid screen and from bottom quarter to bottom. No foldover. Linearity OK.

Check Q601 and Q602 (vert. drive and out) with freeze and transistor tester for leakage. If spayed while in set and picture changes, it/these are problem. Also, with my repair it returned a month later with same problem. Changed same defective Q again but this time added piece of sheet aluminum to heat sink of this Q so that it runs cooler. No return.

Tip kindly supplied by "Tom Oliver"

CT5061

No green in picture -- out of focus

This is a CTC 132 chassis built by RCA in the USA the focus/screen pack cracks from over heating and will need replacing problem is that the part is supposedly unavailable NEWSFLASH the Hitachi 60sx10 has a new style resistor pack which does work ...use carefully think Part no. is ax00004 ?? not quite sure!!

Tip kindly supplied by "John L. McLean" Billings, Montana

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JVC TV's

AV2751

Vertical Collapse. White line going from side-to-side.

Solder loose solder connections at IC421 Vertical output IC.

Tip kindly supplied by "William S. Arnold" Stockton, CA USA

1 to 5 years old

Intermittant loss of colour, pix, audio. Int dead, slow responce to commands acts like MPU is losing it. Also affects remote and keyboard functions

Check standby voltages. Pay specific attention to IC-101 [+9v], if it's output falls below 4.2v the MPU will not function correctly. This reg ic supplies power to quite a large portion of these sets.

Tip kindly supplied by "Art Jernberg" Richnond, Mi

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Kaisui TV's

KR 3910

Doesn't work and later doesn't have color

Replace Zener diode ZD401 9V1, if no color replace IC301 AN5633K

Tip kindly supplied by "Luis Ferreira" Portugal

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Panasonic TV's

TR900 series B&W; CCTV monitor.

No horizontal sweep

Replace Bi-polar 80mfd. yoke coupling capacitor.

Tip kindly supplied by "John R. Wallace"

CT-20R11S

Vertical opens and closes or stays closed, plus there is no audio

Check if the 5 volt source is good at D557

CTK3190S

Vertical stretched at top height control filled top of screen and had four inches of black on bottom

D452 18 volt 1 watt zener cracked

Tip kindly supplied by "Roger" Curly's TV

PV-M2021A TV\VCR

Loses color after warmup

Replace IC3001/VCRS0167-A in VCR circuit.

Tip kindly supplied by "Dean Renz" Vacaville,Ca

TVCR

Extreme contrast overload, Whiting out of picture after being on a short while

Change IC3001 on VCR chassis

Tip kindly supplied by "Richard Gray" Jefferson, Louisiana

Pi/P2 Chassis PTV

Intermittent shutdown.

Panasonic part # TXANV033SER mod. kit AND TXANV011SER mod kit. Suggest taking schematic along or bench service.

Tip kindly supplied by "Art Jernberg" Richmond, Mi.

TC2655

No THT, power click

Replace transistor that drives the High voltage transformer (2SD1441, other type may not work)

Replace C808/47mf/16V with 47mf/50V (primary side): this capacitor can be "dry" and increases the secondary voltage regulation.

Replace capacitors connected to the burned transistor (must be 2Kv or 3Kv)

Replace free run diode in the horizontal diode with BYW96E /3A/1000V

Tip kindly supplied by "Mario Pasquali"

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Philips TV's

General Tips

Power keeps clicking on and off. You can hear the tube loading and unloading.

Check the voltage regulator in the power section (near the power entry of the set) which is mounted against a fairly big heatsink. Then check all the transistors in the area starting with the big ones.

Tip kindly supplied by "tpoint" The Netherlands

GR1AX ....

TV can not start

Replace Elko capacitor (6.8uF 50V) near the High-Voltage Transformer.

Tip kindly supplied by "Milan Plavsic" Belgrade, YUGOSLAVIA

GR1-AX

No picture / No sound

Check diode no. 6523 and coil no. 5524 (Supply Horizontal driver)

Tip kindly supplied by "Rene de Wit" Haarlem / Holland

Kx Series

Power goes on but no vision - screen doesn't get static either

The cascade-circuit is broken. This is a big block (got smaller every year) which is mostly green and is directly connected to the tube by fairly thick cables. This should make the high-voltage a TV tube needs.

Tip kindly supplied by "tpoint" The Netherlands

Model KT3a

Set Hiccups

Replace Flyback Transformer

Tip kindly supplied by "Matthew Sheldrick" Port Pirie, South Australia, Australia

K12

Dead

One of the two resistors on the line that should provide the start voltage for the SMPS IC (TDA2581q) is defect.

Tip kindly supplied by "Matthijs Tinholt" Renswoude, the Netherlands

GR1AX

Set tripping on switch on

Probably due to crowbar circuit firing on the 95V HT line. Replace zeners 6638 - 6640 (BZX79 C36) as one or more is probably leaky

Tip kindly supplied by "Peter Maker" Llantwit Major, S. Wales

Picture and sound ok, but won't change stations. All other functions ok

EEPROM for station memory blown, no I2C communications to UPC

Tip kindly supplied by "Mark Kisogloo" South Africa

Doesn't start, measure no short at Line Transistor

Check audio amplifier TDA 7052

Tip kindly supplied by "JTE" The Netherlands

Chassis 2B

High audible tone,smps and line output transformer with line output transistor ok

Replace TDA8370 (sync. processor)

Tip kindly supplied by "Robert van Schijndel" The Netherlands

20CT 226/16Z

Bad Picture Horizontal noise

Replace R371 10K Var. resistor

Tip kindly supplied by "Luis Ferreira" Portugal

26C9 (Philips/Mag/Crosley)

Horiz. out of sync

recheck b+ with anolog meter your b+ is low.

Tip kindly supplied by "Kenal" s.c.

K9, K11, K12

TV tries to start, dies, tries it again etc.

There's some kind of short in the main power consumers. Usually this is the horizontal transistor (BU20x or 2SD350) or the cascade or the line traformer.

Simply replace it. If it's the transistor, replace by a slightly heavier one :-)

It can also be a bad solder contact (cold weld). Inspect all welds of big resistors and coils.

Tip kindly supplied by "Stefan Wieman" Enschede, the Netherlands

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Pioneer TV's

Ferguson ICC5/Pioneer SV2801

Dead set

Check for dry joints at the LOPT.

Tip kindly supplied by "John Andrews"

SD28AV2

Reduced contrast, especially on one side of the screen. Going dark.

Replace two capacitors in 12V regulator supply. They are next to the 12V regulator

Tip kindly supplied by "Jose Collazo" Spain

SD-P4051

Shuts off and puts random display on screen

Replace micro and install shield and ground, make shield out of copper tape. Also resolder power supply.\ micro p/n PDB032B

Tip kindly supplied by "Dennis McManis" Atlanta Ga

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Pye TV's

37kv1242/05b

No power, slight buzz

Coil 5524 o/c

Tip kindly supplied by "John Porter" Ireland

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Quasar TV's

C108 Chassis

Faint vertical interference lines in picture approx 4" apart

C559 47uFD AT 50V cap

Tip kindly supplied by "Ron" Indiana

ADC163

Vertical jitter

Replace AN5301 IC

Tip kindly supplied by "WOODIE" TULLAHOMA, TN

C163 Chassis

Sound OK - Screen black

Q351 beam defeat transistor 2SB642

Tip kindly supplied by "Ron" Indiana

Chassis C201

No on screen display

D470 5 Volt Zener

Tip kindly supplied by "Ron" Indiana

C144

Picture goes to a white line

L351 on CRT board

Tip kindly supplied by "Ron" Indiana

C148 Chassis

Squiggley lines on CH.2 or maybe on all low band channels

Q3211 on the "W" board

Tip kindly supplied by "Ron" Indiana

VV 2020 (TVCR)

Rolling white bars in picture

Change Q1202 on the vcr chassis. The symptom to confirm this is the 12 volt line is up to 13.9 volts

Tip kindly supplied by "Richard Gray" Jefferson, Louisiana

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Royal HCM TV's

TV5575

Horizontal line on the screen, TV set permanently in on state (unable to switch into standby)

1. The primary fault is empty C909=47uF in power supply.

This empty C909 caused raise of the hor. deflection voltage (nominal 110V) and in turn:

a) Short circuit in transistor Q906 2SC2335 ( it switches 110V to deflection circuit )

b) Vertical deflection IC401 = TDA3653

c) 12V supply to radio frequency section: Zener ZD402 12V (short) and R422 in serial with ZD402 .

The R422 increase its value.

Tip kindly supplied by "Andrzej Maciejewski" Szczecin. Poland

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Sanyo TV's

DS20030

Snow, looks like bad tuner

Replace D521, 5.6V Zener Diode

Tip kindly supplied by "Woodie" Tullahoma, TN

PC-380W

No vert sweep

Open winding / pincushion transformer T4502

Tip kindly supplied by "Bob's TV" Worcester, ma USA

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Samsung TV's

CK6226

No vertical deflection (horizontal line on the screen)

1. Replacement of vertical deflection IC =TDA3654 - no effect

2. Oscillogram of pin 1 TDA2579 (vertical deflection driver): straight line instead of sawtooth.

3. Replacemant of TDA 2579 - no effect

4. Replacemant of 100uF capacitor between TDA3654 pins 6 and 7 and one more replacement of the TDA3654 gives positive result.

- Replaced TDA 2579 is ok. (sawtooth signal has been blocked by the vert. guard circuit).

Conclusion: Empty capacitor was the reason for the break down of the TDA3654.

Tip kindly supplied by "Andrzej Maciejewski" Szczecin, Poland

TXE2045 and 2545 and 2745

Set shuts down after 5 to 10 min

Resolder all leads on 2 rectifier diodes mounted on the lower side of the pcb off pin 1 of STRS6301

Tip kindly supplied by "Dennis McManis" Atlanta Ga

TV-VCR Combo

All dead and erratic go dead

Sub all power supply diodes, they test good in and out of circuit they break down under load [don't spin your tires like I did] found many with same problem.

Tip kindly supplied by "Bob's TV" Worcester, ma USA

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Sharp TV's

13RV21

Low Audio

Replace C1419 .47mfd at 50v

Tip kindly supplied by "Roger" Roseville mn

13HS60

Picture turns black after a few hours of play

Replace jungle IC RH-IX2701CEZZ

Tip kindly supplied by "Dennis McManis" Atlanta Ga

13SB50

Distorted Audio

C1705 in power supply

Tip kindly supplied by "JOHN" BLOOMINGDALE,OH

19C-M100 19" Color

Dead except for sound of starting relay.

Found the relay contact had a bad solder connection to the board. May have been caused by over heating the joint.

Tip kindly supplied by "Bob Ziolkowski" Apopka, FL

19CM100R

Dead

Replace T-602, Q-602 & R-701

Tip kindly supplied by "Lee Lewis"

19MP17

Picture goes to horiz. Line after warm-up.

Resolder large electrolytic capacitor in vert. circuit.

Tip kindly supplied by "Tom Oliver"

25SB70

Dead set. No relay click

Replace relay drive transistor Q1501 - 2SC945 or ECG 85

Tip kindly supplied by "Tom Perrone jr." North East, PA USA

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Ferguson TV's

General

Red cast at switch on, disapears after a few minutes.

Dry joint on the base lead of a transistor. The transistor is situated on the pcb attached to the end of the tube and was marked R.

Tip kindly supplied by "Matt" Scotland

TX100 onwards

Arcing on\off switch

This is common with certain Ferguson sets. Re-solder/Replace on-off switch.

Tip kindly supplied by "John Andrews"

Ferguson ICC5\Pioneer SV2801

Dead set

Check for dry joints at the LOPT.

Tip kindly supplied by "John Andrews"

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Thomson TV's

Inc. SABA , TELEFUNKEN , NORDMENDE , BRANDT , TELEAVIA , RCA, GE , PROSCAN & FERGUSON

ICC 9

Only StandBy.

Try to change TP 66 and TP 69.

Tip kindly supplied by "Gerrit Wege" Essen, Germany

Nord Prestige 72 Chassis F17/ICC5

No Power

Ripple on the 8.5v st.by voltage. This keeps the processor reset all the time. Change reservoir capacitor for the 8.5v st.by supply

Tip kindly supplied by "Caps" Malta

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Fisher TV's

HT-770

Unit in shutdown, high pitched whine from regulator

Replace shorted D404 in high voltage section

Tip kindly supplied by "Gary Striebel" Hawk Point Repair

PC-380W

No vert sweep

Open winding / pincushion transformer T4502

Tip kindly supplied by "Bob's TV" Worcester, ma USA

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Sony TV's

14" & 17" Sets (KV-XXXX)

Intermittent or no Video & Audio

Check for bad solder joints, Check or replace the IFB unit (example IFB-450)

Tip kindly supplied by "Felipe Castro" Mexico

Excessive bright screen or fluctuating brightness

Check the 200V electrolytic which feeds the RGB transistors by adding additional 47uf/250 V electrolytic (This tip may also apply to other models)

Tip kindly supplied by "M.P.Prakash R.Lewis" India

KV2060SA

Audio is there but very soft.

IC 201- CX 20015 It has a built-in volume adj that works hand in hand with the volume control. Change this and you have max volume once again.

Tip kindly supplied by "Reg Fridey" Port Elizabeth - South Africa

KV-20TR22, KV-19TS20

No picture/audio or intermittent picture/audio.

Check grounds on tuner/demod/micro-controller shields. If this doesn't work try insulating insides of shields with electrical tape! Also check for inductive leafs touching together near connector on tuner.

Tip kindly supplied by "Tom Oliver"

KV-20 EXR20

Dead

Replace power converter IC STRS6301A Check carefully if there is no leaky diodes and/or capacitors in the power supply module. Check low - value resistors (0.1 and 0.47Ohm). These problem may cause the new IC to overheat and be destroyed within hours of operation. This is very common problem.

Tip kindly supplied by "Eugene" Vancouver, BC, Canada

KPR46EX30 and similar models

Intermittent convergence errors. Convergence blinking back and forth from correct, to wildly incorrect.

Resolder convergence board. It's the board in front with all the rheostats, visible when you remove the front speaker cover.

Various Models

Intermittent problem. Set looses AFT lock and repeatedly tunes through channel selected.

Resolder connections to leads of transformers inside IF block sub assy. (This requires removal of the module.) Close examination of transformer leads with high magnification reveals tiny cracks in solder joints.

Tip kindly supplied by "Bob Hibbard" Williamsburg VA

KV27EXR10

Distorted picture (Pincushion)

Replace R-527 & IC-531

Tip kindly supplied by "Lee Lewis"

KV27EXR20 - CH.#SCCD50EA

Dead set

Replace STRS6301 & IC-651 (Reg. IC)

Tip kindly supplied by "Lee Lewis"

KV27EXR25

Picture shifts downward and won't hold memory

Replace IC-651

Tip kindly supplied by "Lee Lewis"

kV27S25

Picture to wide, can't reduce to proper size with tv in service mode

Replaced C522, a 1ufd cap in the pin cushion curcuit.

Tip kindly supplied by "Ben Fisher" Champaign,Il

KV27SXR10

Vertical bounce when inputting a video source

Replace leaky C-203

Tip kindly supplied by "Lee Lewis"

KV27T525

No, or dark video

Bad flyback, #1-439-372-13 (Sony#)

Tip kindly supplied by "Lee Lewis"

KV27TR10

G-2 Volts real low with dark picture

Replace R-587, C-570, D-518

Tip kindly supplied by "Lee Lewis"

No raster, audio muted turning up screen gets retrance lines

Replace C-574

Tip kindly supplied by "Lee Lewis"

KV27TS20

Picture has red outline, looks like gassy CRT; (not so)

Replace R-587 & D-518

Tip kindly supplied by "Lee Lewis"

Picture bowed in after warms up

Replace C-55O

Tip kindly supplied by "Lee Lewis"

KV27S20

Tech menu access

I believe that there is a small pinhole in the rear of the set near the ant input area. You must insert a toothpick in it while pressing the power switch. You will need the right remote control to access all user and tech settings.

Tip kindly supplied by "Shane Higgins" Riverside, California

KV27TS21

Horizontal is way off frequency

Replace C-509 & C-511

Tip kindly supplied by "Lee Lewis"

KV27TS22

Intermittent black spots in video

Replace IC-601

Tip kindly supplied by "Lee Lewis"

KV27TS22 - CH.#SCC05RA

Rainbow colors & intermittent picture

Resolder THP-601 & Degauss

Tip kindly supplied by "Lee Lewis"

KV27TS27

Wavy picture

Replace T-604

Tip kindly supplied by "Lee Lewis"

Distorted or no audio

These sets have a small module or i.c. for the stereo mpx, they have smc caps that leak onto the board surface causing failure. They are located on one of the other plug-in modules so you have to pull these out to see this i.c module. Sony part# is 8-746-371-10 part description is I.C. sbx1637-11, cost about $ 57.00

Tip kindly supplied by "BFRYE" Columbia,S.C.

KV27TS30

Very, very dim picture

Replace R-720 on CRT board D-518 & R-587

Tip kindly supplied by "Lee Lewis"

KV27TS31

Picture pulled in on all sides

Replace C-608

Tip kindly supplied by "Lee Lewis"

KV27TS36

Dead set

Replace Q-601, Q-602, R-607

Tip kindly supplied by "Lee Lewis"

KV32S15

Set dead - relay clicks on /off

PM501 (ic)

Tip kindly supplied by "Bob's TV" Worcester, MA USA

KP53V15

Convergence errors, congergence is bowed in on sides

Resolder IC1704 and IC1705 on convergence bd.

Tip kindly supplied by "EDWARD" AMARILLO,TEXAS

 

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Sylvania TV's

RXF155 WA03

All OK except intermittent vert. picture jitter only when playing tapes from a VCR as if out of vert. sync. Also exhibits thin red and blue horiz. lines at bottom of screen.

Hit IC200 with freeze. If picture clears for 30 seconds or so, replace it. Also use heat sink compound on bottom of IC when installing replacement. Suspect bad connection to small heat sink eventually killed OEM IC.

Tip kindly supplied by "Tom Oliver"

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Symphonic TV's

ST191E

Powers up and shuts off

Replace 2.2 ohm resistor off IHVT leading to vert 26v line

Tip kindly supplied by "Dennis McManis" Atlanta Ga

Powers up then shuts off

Check small .33ohm 1/4 watt, 26 volt vcc to vert output vert drive output has to be present or the micro shuts off the relay

Tip kindly supplied by "Dennis McManis Best Buy service" Atlanta G.A.

SV19M

No vertical sweep.

IC3(LA7835) vertical IC.

Tip kindly supplied by "DANS TV SERVICE" Madison, WV

TVCR9E

Low audio hum will not turn on

Replace 6 volt regulator IC351

Tip kindly supplied by "Dennis McManis" Atlanta Ga

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Toshiba TV's

?

No aft lock

Change C171 on the IF subassembly

Tip kindly supplied by "Richard Gray" Jefferson, Louisiana

26"/27" Models

Unit will not fire up. "Tic-tic" sometimes unit would work fine. Progressive problem, eventually dead set always.

Replace leaky C840 330MFD @ 16V or greater. You may want to install a 330MFD @ 25V 105 Degree Temp rating.

210T6B

Distortion/bar across centre of screen

Replace capacitors c318* c316 c451 c311 with 105 degrees c type in area of Lopt T461. Gets rather warm in this area.

* Probable culprit.

Tip kindly supplied by "Chris Bennalick" Guernsey

CF32E50

Vertical Colapse

Replace Q421 9 Volt regulator IC part # T7809BT

Tip kindly supplied by "Roger" Curly's TV

CF2041J

Top half of screen shows horizontal lines bottom half blank. Picture seems compressed to top half.

In Model CF277J I changed TA8724 look for it, IC has history to break down.

TRX 80, 100, 120

Unit turns off when you try to move the antenna.

Replace C809 and C810 on the front power supply. One is a 10uf and the other is a 33 uf electrolytic capacitor. Remove the front panel and you can unsolder both without removing the power supply. Their identifiers are etched on the back of the power supply. Use a pair of tweezers to remove. Pay attention to polarity in replacing caps. One has the negative to the left (as you look at it). The other has the negative to the top.

Tip kindly supplied by "Rich"

CF2048 & CX2168C

No power, Dead Set.

Replace C841 and C840 they short.

Tip kindly supplied by "BFRYE" Columbia,S.C.

TP50F50/51 Also E Line

Intermittent loss of convergence correction. Digital Convergence models only.

Add C-7773, 470 @ 50WV to marked location, front left.

Change C-7768 from .01mfd to .1mfd located front, centre of digital convergence upright board.

Tip kindly supplied by "Art Jernberg" Richmond, Mi.

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Magnavox TV's

13PRC1

Dead Set

Faulty horizontal output transistor (Q502) and blown circuit mounted fuse (F401)

Tip kindly supplied by "Bobby White" Harrison, AR.

25n101

Dead Set

Check R417 100k resistor open

Tip kindly supplied by "David Stancil" Clinton North Carolina

C5 Chassis

Bright screen, Washed out pix.

 

Check R408 for open (Feeds 12V. & 24V. lines)

Tip kindly supplied by "Marvin Brown, John Eye Service" Beckley WV.

C8 Chassis

Excessively bright raster with retrace lines

Check R25 100 Ohm gone high in value

Tip kindly supplied by "Marvin Brown, John Eye Service" Beckley WV.

25/27 G1 Chassis

Relay click only at power on

Unsolder pin 18 of the micro IC IC350. If power and HV returns change microprocessor IC350

Tip kindly supplied by "Weavers Electronics" Oak Harbor, Ohio

PTV 730 Series

Fluid spilled onto power pcb

ATTN TECHS Magnavox is trying to solve their mistake. The red lens was used for the blue tube in production to save design and build costs of a dedicated blue lens. They turned the red lens 180 deg. this puts the vent/fill cap facing the chassis, I have spent hours on the phone with Phillips trying to get a good fix for the problem. They will not recommend this but it is the only true fix for now remove the blue tube and turn upside down. Replace vent cap gasket and fluid damaged pcb's. Magnavox will pay for warranty on these sets but they only pay $70.00 for a 2.5 hour job and that is for a tech that has repaired lots of them. Up to 4 hours for a tech who has not. Lets get Phillips to pay for their mistake like we did to Mitsubishi (vs series tubes) any ?

Drop me a e-mail DMcma56127@aol.com

Tip kindly supplied by "Dennis McManis" Atlanta Ga

RR2541A401/25Y1 Chassis

Cannot turn unit off.

Open R438(680K*1/2W) resistor and leaky Q400 transistor.

Tip kindly supplied by "William S. Arnold" Stockton, CA USA

27Y1 chassis

Dead Set

Replace Q400 and STR30130 IC Regulator.

Chassis's G6, E5/6, & B5

Remote lock up... Remote does not work when unplugged and plugged back in...remote works. Highly intermittent

Change microprocessor IC345 with new number 483520988291

Tip kindly supplied by "Marlin Johnson" The M & D BBS Carmichael, Ca

B-5 chassis

Customer may complain of hearing popping or picture jumping! set will normally still be playing.

The flyback is leaking high-voltage from the top of the transformer where the h.v anode lead comes out.WARNING: Dont stick your hand near this G-6 chassis flyback, it will get you!!

To confirm if flyback is leaking take a h.v. probe (only) and run it around the top of flyback where the h.v. lead comes out you will draw an arc if it is leaking.

SPECIAL NOTE: Somtimes these arcing flybacks will knock out static sensitive I.C.s like micro etc. so if you have a dead set or some other problem always check the flyback too!

Tip kindly supplied by "BFRYE" Columbia,S.C.

All G6 chassis

Repeat failure of Horizontal output.(Q502)

Modification needs to be done.

Replace Q502 part# 483513047897

Replace Q501 part# 483513047073

Replace F401 part# 483525397031

Install C509 part# 483512247008 board is already screened and pre-drilled for this (270pf)cap.

Install resistor and diode assembly with part# 483521957539. This is to be installed with the anode of the diode attached to the junction of D530 and R530.the resistor end is to be attached to the base of Q501.

ALL PARTS ARE AVAILABLE FROM NAP.

Tip kindly supplied by "BFRYE" Columbia,S.C.

L1 Chassis

Dead - Relay engaged. Set has no start voltages

Check for R502 47k 1/2watt resistor

Tip kindly supplied by "Ron Porter"

L1 and L4 Chassis

No power, no shorts. Relay clicks

Check the 47k 1/2 Watt resistor that feeds the B+ to the horizontal drive circuit. It will be open... may be R407...

Tip kindly supplied by "DAN S." PA

Relay "clicks" B+ on horiz. output trans. OK. scope on base shows no horiz. drive (may also have blown horiz. out & fuse F401)

R502 47K ohm open

Tip kindly supplied by "Marvin Brown, John Eye Service" Beckley WV.

N1 Chassis

Over bright screen with retrace lines, Collector V. on output transistors measure very low (9-10V.)

Open R451

Tip kindly supplied by "Marvin Brown, John Eye Service" Beckley WV.

Magnavox NAP Chassis, X6 Chassis

Intermittent loss of sync

Replace Y620, 3.58 crystal. P/N 4835 242 77215

RS1360C10

Sound goes off, picture stays on

Replace R438 680 1/2 Watt resistor

Tip kindly supplied by "Lee Lewis"

RS2041 - 19P102

Dead Set

Check IC-351 Pins 7&8 for proper voltage & pin 33 for reset.

Tip kindly supplied by "Lee Lewis"

RX1935WA21 CHASSIS 19L402

Dead Set

Replace R-502 in horiz. drive circuit & IC-430 (STR30130)=ECG 1777 (R-502=47K 1/2 Watt)

Tip kindly supplied by "Lee Lewis"

RX4030WA02 CHASSIS # 13L404

After warm up, Set changes channels on it's own

Replace IC-350 #483520987257

Tip kindly supplied by "Lee Lewis"

RX4030 WG01

No sound or raster

Check for shorted audio IC,7103 & open 3625

Tip kindly supplied by "Johnnie Peyton" Bonaire Ga.

RX4240 WA02

Dead, relay clicks.

Q502 (D1554) H-OUT, IC430 (STR30130) 130V Regulator, R502 (47K, 1/4W) Resistor.

Tip kindly supplied by "DANS TV SERVICE" Madison, WV

RK4549 AK02

Powers up inter. without command & pulsates on & off at approx. 1 sec interval

Replace C421 in SMPS

Tip kindly supplied by "Johnnie Peyton" Bonaire Ga.

HK27643

Picture OK, No Sound

Replace IC 241-ecg 1852

Tip kindly supplied by "Lee Lewis"

25S1 Chassis

Small vertical sweep only 1 inch high, voltage on B. of Q565 only 3v.

R565 56K resistor open

Tip kindly supplied by "Marvin Brown, John Eye Service" Beckley WV.

PR1910C123 - Chassis 19G602-00AA

No power

After replacing 2.5 amp fuse, STR30130 (VREG), PH610629 (HOT), I found unit ran for 2 or 3 seconds then blew fuse again. I looked for high value caps that were low. I replaced a 2200uF50V capacitor and it runs great.

Tip kindly supplied by "California" Riverside

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Mistubishi TV's

CS1954R

Insuffient vertical sweep. Compressed at top of screen

Replace C411 Capacitor. 4.7uf @ 250v.

Tip kindly supplied by "R. B. L." Pittsburgh, Pa.

CS-2656R

Audio OK. No video, but high voltage and menu display are good. Input selection has no effect.

I have seen a CS-2656R with the same problem after being hit 3 times by lightning via co-ax cable, I believe. I did the repair the last 2 times, and both times it was IC202. Check IC202 (12 pin SIP - dual audio/video switch) by jumping p11 and p12.

Tip kindly supplied by "T. Oliver" MA

VS4003

IC401 burns as soon as installed.

Replace dried Cap in 28 volt line C920 10mfd@100v. Check D4000 12v zener diode for leakage. Install C920 on foil side of pc board to prevent cap from drying out in the future due to the locality of a heat sync next to C920. and of course replace IC401 with a new output (LA7838).

Tip kindly supplied by "William S. Arnold" Stockton, CA USA

VS-405R

Picture is weak and color is washed out.

You may have weak projection tubes. A work around I have found that works is . . . there are TWO ceramic resistors on the main pc board sitting next to each other (where the flyback transformer is mounted) they are in series with the flyback winding that supplies the voltage to the projection tubes filaments. If you jumper just one (they are in parallel with each other) you increase the voltage to the tubes and it's just like new.

This fix has worked on my Mits for over 2 years!

Tip kindly supplied by "Dave Mc Gaffney" Massillon, Ohio USA

Dead... (picture might shrink before failure)

I have found the yokes on the projection tubes fail. and arc to the tubes coating. Sometimes you can just apply shellac to windings and let them dry for a few days, other times you have to replace the yokes When they fail they usually distroy the horizontal output transistor and blow the main fuse.You can get yokes for this model as Mits does have a sub!

Tip kindly supplied by "Dave Mc Gaffney" Massillon, Ohio, USA

VS4506R

Starts up & shuts down immediately.

Replace open R540, leaky C540 & vertical IC401.

Tip kindly supplied by "Dean Renz" Vacaville, CA

VS5XXX Series

Vertical compression and line across centre

Looks like Magnavox is not the only company with leaky CRT'S this gem will leak fluid onto your IC401 causing severe galvanic corrosion at the pins and if the tube is not changed it will repeat same or you can try to seal with industrial grade sealant such as DOW CORNING 732 or DOW 738 lets have MITSUBISHI pay for these they are handling on a case by case basis I believe. They are possibly "gun" shy after the massive CRT problems of a few years ago. No pun intended.

CT-25/29B2 Chassis Euro11

Starting normally, then goes down to standby.

Don't try to measure, you will find nothing wrong. Just change following Caps in the primary power-supply: C905,C906,C920.

Don't forget D909.

Tip kindly supplied by "Thilmany Guy" Sanem- Luxembourg

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MGA TV's

1-2 year old projo & direct view

SQV Function causes set to lock up. Have to use timer reset to unlock. Lockup occurs after last station of SQV memory has been accessed.

Manual states ul to 48 channel labels and up to 15 SQV positions. They use the same memory chip. When it fills up, Bingo/Lockup. Check with MGA Tech line on resetting SQV Memory for proper procedure. Tell customer total of SQV & labels not to exceed 35 when resetting DO NOT press QV, only SQV !

Tip kindly supplied by "Art Jernberg" Richmond, Mi.

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Nap TV's

Chassis 19L4

Dead

R502 47K 1/2W Resistor

Vertical distortion, may vary while watching

B+ is running low-- STR30130

27R1 Chassis

Won't turn on for about a minute or so after being plugged in

C460 10uFD 50V Cap - Causes 11V supply line to be low

Tip kindly supplied by "Ron" Indiana

25C5 Chassis

Intermittent startup or no startup, voltage may fluctuate trying to start

Check for burned or shorted Yoke windings - Take off and visually inspect

Tip kindly supplied by "Ron" Indiana

Chassis 25G1-04

Power supply fluctuating trying to start

R445 1 ohm

25/S1/S4

Initially Dead, after first repair, cannot shut off.

First repair bad 2.5 amp pico fuse and horizontal output transister. After replacing both parts set powers up and cannot shut off.

Have to replace B+ regulator p/n STR30130.

Tip kindly supplied by "Phil's T.V." Cheshire CT

C9 CHASSIS

Vertcal shrinks after warmup. May stay small

Check or change any or all of the following components :-

R243 (3meg), R239(10meg), R253(10meg), R252(4.7meg) and C201(.22ufd)

Tip kindly supplied by "DAN S." TAYLOR, PA

F1 Chassis

Blinkin or hunting for channel. Picture mat also go grainy

Replace L243. Most times tapping it will make it act up.

Tip kindly supplied by "DAN S." TAYLOR, PA

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Zenith TV's

19" models

Whines when cord is plugged into the wall almost like a high pitched buzz

Replace flyback transformer

Tip kindly supplied by "MBrown" Houston

SMS1917SG

Sound is full blast, volume control has no effect.

IC1200(TA8879N). NOTE: pin-56 had 6.9V and should have been 1.8V. Also check IC6000 pin-40 for voltage change with volume change on-screen (should range from .09V to 5V).

Tip kindly supplied by "DANS TV SERVICE" Madison, WV

A1926W

Intermittent or no start

Replace C3210, 220@6.3V

Tip kindly supplied by "Johnnie Peyton" Bonaire Ga.

Assorted

Difficulty finding model/chassis listings in Sams Photofacts

Many chassis # hard to identify, especially sets made for Sears. Ztips on 3.5 floppy from zenith provides solution in most cases.

Tip kindly supplied by "Johnnie Peyton" Bonaire Ga.

SF LIne

Slow to come on, may sound like it is running on a flat tire, set works good after 15 minutes

There is a 30uf at 50v cap located under a shield located on the upper right side of the chassis this cap has leaked fluid, replace cap with a 100/100 capacitor

Tip kindly supplied by "Joe Crews" Crews TV & VCR Service

Models with 9-516 module

Slow to come on or pulsates trying to come on

C3413 100uFD AT 25V or C3412 10uFD AT 250V Cap

Tip kindly supplied by "Ron" Indiana

Sets with 9-181 Module

Very poor picture - looks like a bad picture tube

R2590 or R2591 150K 1/2 Watt resistor

Tip kindly supplied by "Ron" Indiana

9-160,9-181,9-214 ect.

Half of the picture is very dark

10uf @ 315 volts is bad. cap located near front edge of module near ac plug.

9-1457-1 (MODULE)

Vertical collapse, No vertical deflection

R3209 2.2 ohm 1/2 watt Resistor is open.

Tip kindly supplied by "Dan S." PA

PRO830X (Projection TV)

No control Menu

Replace IC-6004 chip on 9-700 module

Tip kindly supplied by "Lee Lewis"

PRO841X (Projection TV)

No Video

Replace Q-3 on 9-749 Video input module.

Tip kindly supplied by "Lee Lewis"

PV-4039H

No Video, Audio Fine

Shorted T-8501 on 9-180-01 module

Tip kindly supplied by "Lee Lewis"

PV-4539

Green Picture

Replace Chroma/Vert. Module #9-152-04

Tip kindly supplied by "Lee Lewis"

SLS2549S

Horizontal bright line across center of screen the rest of the raster is black.

Replace "Open" R3209 2.2 ohm 1/2 watt resistor near the Vertical output IC.

Tip kindly supplied by "William S. Arnold" Stockton, CA USA

Thin line across screen (No vertical sweep)

Check solder connections on vert output IC if these are good check for 1 of th 3 2.2 Ohm resistors in front of the vert output IC for an open.

Tip kindly supplied by "John Takach" Ffairless Hills ,PA

PV 5263 "Big screen"

Colors out of convergence bowed in on sides

9-1302 Module bad

Tip kindly supplied by "Marvin Brown, John Eye Service" Beckley WV.

Digital TV. /Bose Sound

Bad Vertical Lin.

C2107 Near heat sink on sweep Bd. [33UF 16V.]

Tip kindly supplied by "Marvin Brown, John Eye Service" Beckley WV.

SF2517TR2

Intermittent or no start

Check for low fluctuating voltage at Q4100, Replace C3407 (100@25V)

Tip kindly supplied by "Johnnie Peyton" Bonaire Ga..

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General Faults

Occasional high voltage "pop" causing set to loose picture momentarilly

This problem comes up every now and again, usually it's caused by the high voltage "shield" that is also used as a heat sink for the vertical/horizontal output transistors. Best bet is to ensure that the "screen" is properly grounded to main ground.

Tip kindly supplied by "Tom Sharka" Pope AFB, NC

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Has anybody got some more tips for me, please !!!!
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If you have any tips that you would like to share with us please use the Submit form or if you need help on a particular fault, please use the Help Form or mail me on, pad@guernsey.net

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