| Make | Model | Problem | Solution | Date |
| | | |
| Found: 1049
|
| Panasonic | Alpha 3 | Colour varies - blue content reduces - int | C352 330pF ceramic cap decoupling Q366 emitter | 14-09-04 |
| Panasonic | Alpha 3 | Dark blank raster - no sound. | C1251 ( 10nf ) leaky , main microcontroller & memory chips. | 14-09-04 |
| Panasonic | Alpha 3 | Dark blank raster with no sound or display | No micro activity - dis serial & clock lines to Txt panel to elliminate this cct; set works when this was done - IC3507 was faulty (MAB8461PW13S) | 14-09-04 |
| Panasonic | Alpha 3 | Dark pic getting worse with time | Q355 2SC3311 on crt base leaky (black level ref) | 14-09-04 |
| Panasonic | Alpha 3 | Dead - blows R822 4R7 5W & R555 LOP fusible | Line drive wfm dist - C501 0µ1cap in line osc stage leaky | 14-09-04 |
| Panasonic | Alpha 3 | Dead - LOPTr leaky | Also check R567 1A fuse feeding LOP stage for o/c | 14-09-04 |
| Panasonic | Alpha 3 | Dead - R555 fusible res o/c in LOP stage feed | LOPTx | 14-09-04 |
| Panasonic | Alpha 3 | DEAD APART FROM BUZZING NOISE | R555 FUSIBLE RESISTOR OC IF EHT TOO HIGH AFTER REPLACING SUSPECT LOPT | 14-09-04 |
| Panasonic | Alpha 3 | Dead with LED flickering at sw on | Q823 conducting as opto was turned on; Q825 was sw on because C822 0µ01 ceramic cap leaky | 14-09-04 |
| Panasonic | Alpha 3 | Dead. | R555 HT feed o/c. | 14-09-04 |
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|
| Panasonic | Alpha 3 | E-W bowing with no control effect | Check TDA8145 IC701 & R708 & L701 also 0µ01 50v decoupling cap to pin 1 IC701 | 14-09-04 |
| Panasonic | Alpha 3 | Fault Notes: Panasonic Alpha 3 Chassis | See TV Mag July 1994 | 14-09-04 |
| Panasonic | Alpha 3 | Field collapse | C400 10n 50v connected to pin 2 TDA2579A tbase chip | 14-09-04 |
| Panasonic | Alpha 3 | Goes dark with no sound when heated | C1251 10nF was leaky in micro reset cct | 14-09-04 |
| Panasonic | Alpha 3 | Goes off aft 3 hours - flashes & shuts down | Check heatsink clip on IC891 | 14-09-04 |
| Panasonic | Alpha 3 | GREEN AND RED "GLITCHES" ACROSS SCREEN , TEXT DISP | C649 ( 120pf ) PIN 3 IC302 PIC TRANSIENT | 14-09-04 |
| Panasonic | Alpha 3 | INT DIAGONAL BLACK/WHITE STRIPES | D329 ZENER Pt No MA4068 | 14-09-04 |
| Panasonic | Alpha 3 | Int loss of sound & pic | Dry joints prescaler chip inside tuner | 14-09-04 |
| Panasonic | Alpha 3 | INT LOSS OF TUNING | DRY JOINTS ON PRESCALER IC IN TUNER | 14-09-04 |
| Panasonic | Alpha 3 | Loss of Video & Audio sigs | Loose panel H due to customer pushing in Scart leads | 14-09-04 |
| Panasonic | Alpha 3 | No col when using AV connector | Check front AV2 source sw is not set to "S" posn | 14-09-04 |
| Panasonic | Alpha 3 | No Colour | IC303 TDA3505 vid control chip pin 16 was low instead of 3v - C644 0µ01 ceramic decoupler leaky | 14-09-04 |
| Panasonic | Alpha 3 | No colour | Ref osc not working; 0µ01 ceramic cap connected to pin 14 IC601 decoder chip leaky | 14-09-04 |
| Panasonic | Alpha 3 | NO COLOUR PIN 16 TDA 3505 LOW ( NOT 3v ) | C644 0.01uF SC | 14-09-04 |
| Panasonic | Alpha 3 | No g in txt | D3309 o/c - D3308 or D3310 could cause same problem with other cols | 14-09-04 |
| Panasonic | Alpha 3 | No tuning memory | Chip select signal from pin 53 of micro to memory chip missing - L1209 o/c | 14-09-04 |
| Panasonic | Alpha 3 | Poor focus - adj focus varies brill | internal leak in CRT between A1 and focus electrodes | 14-09-04 |
| Panasonic | Alpha 3 | R822 4R7 10W SURGE LIMITER BLOWN , WHEN REPLACED R | REPLACE C501 0.1uF | 14-09-04 |
| Panasonic | Alpha 3 | Red & Green 'gliches' across screen int | OK in Txt mode - C649 120pF faulty - pin 3 IC302 transient improvement chip | 14-09-04 |
| Panasonic | Alpha 3 | St/by only | Q825 opto driver hard on. Removing R843 which links base of tr to micro power on/off pin produced a blank raster. Micro reset line stuck at 2v instead of 5v - C1251 10nF was leaky | 14-09-04 |