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Repair tips

Electronic appliance repair tips database - TV (LCD,TFT,Plasma,Digital), Monitor, VCR, DVD recorder and player, Digital camera, Audio equipment, Microwave ovens, Phone systems, Computer repair

MakeModelProblemSolutionDate
Found: 1049
PanasonicAlpha 2WBlowing line transistors.Drys on line driver transformer.14-09-04
PanasonicAlpha 2WDeadNo volts pin 2 IC801 chopper; check R803 & R827 220k14-09-04

PanasonicAlpha 2WDead - IC1204 (st/by 5v reg) overheats with only 1v on o/pzener D171 MA4082 is leaky, microprocessor IC1203 MAB8461PW134 is faulty.14-09-04
PanasonicAlpha 2WDead - loptr 2SD1441 s/c, R567 1A link o/cNew parts went way of originals - HT high due to STR54041; also damaged CITAC chip SAB3035 causing blank raster/no sound via aerial or AV14-09-04
PanasonicAlpha 2WDEAD check for 0.4V pin 2 IC801 if missingCHECK R803 AND R827 ( 220K ) if ok replace R815 ( 5R6 ) Q801 & Q802 & STR5404114-09-04
PanasonicAlpha 2WE-W distL752 s/c or C754 180pF leaky in base to Q75114-09-04
PanasonicAlpha 2WExcess width & no E?WCrack in print by pin 1 LOPTx14-09-04
PanasonicAlpha 2WFaint line shading down right hand side.C858 ( 1 , 000uf , 25v ) leg not through PCB.14-09-04
PanasonicAlpha 2WField collapseIC501 TDA2579A & check C403 0µ01 pin 2 IC for leak14-09-04
PanasonicAlpha 2WGoes bright red then trips offQ353 red o/p tr coll drops to 3.5v - L353 180µH coil o/c14-09-04
PanasonicAlpha 2WLine output transistor scCheck for dry joints on line drive tx ( often invisible )14-09-04
PanasonicAlpha 2WLines on pic & whistleSTR50401 - use genuine replacement14-09-04
PanasonicAlpha 2Wno picture, only blank rasterL303 10uF o/c in 12V supply. I found leaky zener D171, after replacing it the IC1204 was still running hot, but with 4 volts on the output at this time. When I disconnected pin28 of microprocessor, the supply was at 5 volts and the regulator wasn't hot. pin28 measured 1kOhm to ground. When a new chip arrived, it measured 1kOhm as well, the only difference is when you freeze the faulty IC, resistance goes up to 3kOhm, when you freeze the new IC, resistance goes down to 0.4kOhm. After replacing the micro controller, IC1204 5v regulator was running cold. The micro controller was 15 UK pounds +VAT from HRS.14-09-04
PanasonicAlpha 2WNo signals - R/C functs slow & erraticTuner faulty even tho connecting ext dc supply to BT pin produced signals (prescaler fault) - repaired at MCES - RC slow operation normal with lack of sigs14-09-04
PanasonicAlpha 2WNo sound or vision - heaters & EHT presentChoke L853 TLT030L119C attached to 12v reg o/c14-09-04
PanasonicAlpha 2Wnon lin top of field scan or portion missingR469 underneath R551 10R 7w - could be either 150R, 270R or 470R 1w14-09-04
PanasonicAlpha 2WPic pulling to rightdry joints line dr tfmr14-09-04
PanasonicAlpha 2WPOOR WASHED OUT PIC , NORMAL SOUND . MAY BE JUST BLC626 10nf - DECOUPLING PIN 19 TDA350514-09-04
PanasonicAlpha 2WPowers up but shuts down , prog No remains , shortL303 oc14-09-04
PanasonicAlpha 2WScreaming PSU onlyHT 175v (158v) - R567 o/c, C808 10µ 50v leaky14-09-04
PanasonicAlpha 2WSqueal at sw on then dead except chan indQ551 lop tr s/c; D854 over volts s/c; R564 fusible o/c - check C808 10µ 63v & IC801 STR54041M & dry joints14-09-04
PanasonicAlpha 2WSquealing.2SD1441 may check Ok , Drys on line driver transformer.14-09-04

PanasonicAlpha 2W TX24T1Bright raster with fb linesD551 cooked - mounted just to the left of LOPTX under R557 [6.8 ohm 1W] - also replace C554 10µ 250v14-09-04
PanasonicAlpha 2W TX24T1No picR390 120k 1/2w on crt base14-09-04
PanasonicAlpha 2W TX24W1Bright red pic (or Blue/Green)Check relevant peaking coil on crt base (L351, 352, 353)14-09-04
PanasonicAlpha 2W TX25T2Shuts down shortly aft sw on b4 raster appears - chan ind remainsBeing told to sw off by micro - lift link R1245 to disable - D1315 MA700 leaky14-09-04
PanasonicAlpha 2W TX25T2Field - height excessive with top foldoverR469 150R o/c (under white ceramic res by loptx)14-09-04
PanasonicAlpha 3AFTER 5mins PIC + SOUND DISAPPEARSTUCK IN RESET C1251 10nF14-09-04
PanasonicAlpha 3Black diagonal lines across pic - very intD329 zener diode was leaky MA4068 - stabilises supply to TDA4670 IC30214-09-04
PanasonicAlpha 3Bright flyback lines across top of screen - very intFit kit TZSEN001 consisting of replacement scan coil and FOP chip14-09-04
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