| Make | Model | Problem | Solution | Date |
| | | |
| Found: 1049
|
| Panasonic | Alpha 2W | Blowing line transistors. | Drys on line driver transformer. | 14-09-04 |
| Panasonic | Alpha 2W | Dead | No volts pin 2 IC801 chopper; check R803 & R827 220k | 14-09-04 |
| Panasonic | Alpha 2W | Dead - IC1204 (st/by 5v reg) overheats with only 1v on o/p | zener D171 MA4082 is leaky, microprocessor IC1203
MAB8461PW134 is faulty. | 14-09-04 |
| Panasonic | Alpha 2W | Dead - loptr 2SD1441 s/c, R567 1A link o/c | New parts went way of originals - HT high due to STR54041; also damaged CITAC chip SAB3035 causing blank raster/no sound via aerial or AV | 14-09-04 |
| Panasonic | Alpha 2W | DEAD check for 0.4V pin 2 IC801 if missing | CHECK R803 AND R827 ( 220K ) if ok replace R815 ( 5R6 ) Q801 & Q802 & STR54041 | 14-09-04 |
| Panasonic | Alpha 2W | E-W dist | L752 s/c or C754 180pF leaky in base to Q751 | 14-09-04 |
| Panasonic | Alpha 2W | Excess width & no E?W | Crack in print by pin 1 LOPTx | 14-09-04 |
| Panasonic | Alpha 2W | Faint line shading down right hand side. | C858 ( 1 , 000uf , 25v ) leg not through PCB. | 14-09-04 |
| Panasonic | Alpha 2W | Field collapse | IC501 TDA2579A & check C403 0µ01 pin 2 IC for leak | 14-09-04 |
| Panasonic | Alpha 2W | Goes bright red then trips off | Q353 red o/p tr coll drops to 3.5v - L353 180µH coil o/c | 14-09-04 |
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| Panasonic | Alpha 2W | Line output transistor sc | Check for dry joints on line drive tx ( often invisible ) | 14-09-04 |
| Panasonic | Alpha 2W | Lines on pic & whistle | STR50401 - use genuine replacement | 14-09-04 |
| Panasonic | Alpha 2W | no picture, only blank raster | L303 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 |
| Panasonic | Alpha 2W | No signals - R/C functs slow & erratic | Tuner faulty even tho connecting ext dc supply to BT pin produced signals (prescaler fault) - repaired at MCES - RC slow operation normal with lack of sigs | 14-09-04 |
| Panasonic | Alpha 2W | No sound or vision - heaters & EHT present | Choke L853 TLT030L119C attached to 12v reg o/c | 14-09-04 |
| Panasonic | Alpha 2W | non lin top of field scan or portion missing | R469 underneath R551 10R 7w - could be either 150R, 270R or 470R 1w | 14-09-04 |
| Panasonic | Alpha 2W | Pic pulling to right | dry joints line dr tfmr | 14-09-04 |
| Panasonic | Alpha 2W | POOR WASHED OUT PIC , NORMAL SOUND . MAY BE JUST BL | C626 10nf - DECOUPLING PIN 19 TDA3505 | 14-09-04 |
| Panasonic | Alpha 2W | Powers up but shuts down , prog No remains , short | L303 oc | 14-09-04 |
| Panasonic | Alpha 2W | Screaming PSU only | HT 175v (158v) - R567 o/c, C808 10µ 50v leaky | 14-09-04 |
| Panasonic | Alpha 2W | Squeal at sw on then dead except chan ind | Q551 lop tr s/c; D854 over volts s/c; R564 fusible o/c - check C808 10µ 63v & IC801 STR54041M & dry joints | 14-09-04 |
| Panasonic | Alpha 2W | Squealing. | 2SD1441 may check Ok , Drys on line driver transformer. | 14-09-04 |
| Panasonic | Alpha 2W TX24T1 | Bright raster with fb lines | D551 cooked - mounted just to the left of LOPTX under R557 [6.8 ohm 1W] - also replace C554 10µ 250v | 14-09-04 |
| Panasonic | Alpha 2W TX24T1 | No pic | R390 120k 1/2w on crt base | 14-09-04 |
| Panasonic | Alpha 2W TX24W1 | Bright red pic (or Blue/Green) | Check relevant peaking coil on crt base (L351, 352, 353) | 14-09-04 |
| Panasonic | Alpha 2W TX25T2 | Shuts down shortly aft sw on b4 raster appears - chan ind remains | Being told to sw off by micro - lift link R1245 to disable - D1315 MA700 leaky | 14-09-04 |
| Panasonic | Alpha 2W TX25T2 | Field - height excessive with top foldover | R469 150R o/c (under white ceramic res by loptx) | 14-09-04 |
| Panasonic | Alpha 3 | AFTER 5mins PIC + SOUND DISAPPEAR | STUCK IN RESET C1251 10nF | 14-09-04 |
| Panasonic | Alpha 3 | Black diagonal lines across pic - very int | D329 zener diode was leaky MA4068 - stabilises supply to TDA4670 IC302 | 14-09-04 |
| Panasonic | Alpha 3 | Bright flyback lines across top of screen - very int | Fit kit TZSEN001 consisting of replacement scan coil and FOP chip | 14-09-04 |