2. NO PICTURE(RASTER OK)
CHECK VIDEO SIGNAL AT PIN 13 OF I501(TDA8374A)
[REFER TO WAVEFORM 
]
| ABNORMAL |
|
|
CHANGE INPUT MODE |
|
| |
RF | AV RF | CHECK / REPLACE |
|
|
|
| |
| ABNORMAL | I701 | ABNORMAL |
|
| & PERIPHERAL |
|
|
| COMPONENT |
|
CHECK PICTURE CONDITION |
|
| |
NORMAL | NORMAL |
|
|
FAVOURITE |
| CHECK / | |
|
| CHECK / | |
| ABNORMAL | REPLACE | |
| REPLACE | ||
| R759,R720 | ||
|
| Q702, Q703 | |
|
| I703 | |
|
|
| |
CHECK TUNING VOLTAGE | OK |
| |
AT VT OF TUNER |
| ABNORMAL | |
| ABNORMAL | CHECK 33V LINE | |
|
|
| |
| NORMAL |
|
|
CHECK BAND SELECT |
|
| |
VOLTAGE AT BL,BH,BU |
|
| |
& B+ VOLTAGE |
| ABNORMAL | |
OF TUNER |
| ||
|
|
| CHECK / REPLACE | CHECK / REPLACE | |
| ABNORMAL | ||||
| AT PIN 40, 41, 42 | I901, I902, I903 |
| ||
| NORMAL |
| |||
|
| ||||
| OF I701 | (CRT BOARD) OK | |||
|
|
| |||
CHECK / REPLACE TUNER
NORMAL
NORMAL
|
|
| OK | CHECK / REPLACE |
CHECK / REPLACE |
| |||
| Q705,Q706,Q707 | |||
|
| |||
Q101, Q102, SF101 |
|
| Q708,Q709,Q710 | |
|
|
|
| |
|
|
|
|
|
CHECK / REPLACE |
|
|
| |
| I501 |
|
|
|
|
|
|
|
|
NORMAL
CHECK WAVEFORM AT
PIN 29, PIN 30 OF I501
|
|
|
|
|
|
|
|
|
| NORMAL |
|
| ABNORMAL | ||
|
|
|
|
|
|
|
|
CHECK WAVEFORM |
| CHECK / REPLACE |
| ||||
AT PIN 31, PIN 32 |
|
| |||||
| I501 |
| |||||
| OF I501 |
|
| ||||
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
| NORMAL |
|
| ABNORMAL | |
CHECK WAVEFORM |
| CHECK / REPLACE |
| ||
AT PIN 19, 20, 21 |
| I502(TDA4665) |
| ||
| |||||
OF I501 |
| I503(TDA8395) |
| ||
|
|
|
|
|
|
| NORMAL |
|
| ABNORMAL | |
CHECK VIDEO SIGNAL |
| CHECK SIGNAL |
| ||
AT CATHOD OF CRT |
|
| |||
| AT PIN 18 |
| |||
[REFER TO WAVEFORM |
|
| |||
| OF I501 |
| |||
] |
|
| |||
|
|
|
| ||
|
|
|
|
|
|
| NORMAL |
|
| ABNORMAL | |
|
|
|
|
|
|
CHECK / REPLACE |
| CHECK VOLTAGE |
| ||
| VIDEO B+, |
| |||
CRT |
|
| |||
| HEATER |
| |||
|
|
|
| ||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ABNORMAL | |
|
|
| CHECK |
| |
OK |
| HORIZONTAL |
| ||
|
|
| CIRCUIT PARTS |
| |
|
|
|
|
|
|
|
|
|
|
|
|
41
