Trouble Shooting Charts
1. NO RASTER
CHECK MAIN B+(+123V/+110V) LINE
ABNORMAL |
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CHECK VOLTAGE AT |
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(+) OF C807(220∝F 400V) |
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310Vdc AT AC 220V |
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| NORMAL |
ABNORMAL |
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| CHECK / REPLACE |
CHECK / REPLACE F801 | |
FUSE(T4A 250V) | & PERIPHERAL |
| COMPONENT |
CHECK / REPLACE |
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D801~D804(1S1888X4) | CHECK /REPLACE |
R803(10W 3.3OHM) | I804(PC817) |
| D812(BYW 95C) |
| R814(2W 56K) |
NORMAL
CHECK HEATER VOLTAGE, VIDEO B+(200V) LINE, 16.5V & 48V LINE
ABNORMAL | NORMAL |
CHECK HORIZONTAL
DRIVE PULSE AT PIN 40
OF I501(TDA8374A)
[REFER TO WAVE
FORM ]
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| ABNORMAL |
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| NORMAL | |
| CHECK HORIZONTAL |
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| CHECK / REPLACE | ||
| Vcc(+8V DC) AT |
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| R410(1/4W 3.9) | |||
| PIN 37 OF I501 |
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| 1401 (2SD1207) | |||
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| T401 | |
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| Q402 (2SD2499) | |
ABNORMAL |
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| CHECK SDA(PIN 8) |
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CHECK POWER SWITCHING VOLTAGE AT PIN 43 OF I701 *POWER ON; HIGH
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NORMAL | ABNORMAL | |
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CHECK VOLTAGE(+5V DC)
AT PIN 11 & PIN 37 OF I701
NORMAL ABNORMAL
CHECK SDA(PIN 3)
& SCL(PIN4)
WAVEFORM OF I701
CHECK / REPLACE
X701(20MHz, 18MHz)
CHECK / REPLACE
I802(TDA8138)
I803(KA7808)
ABNORMAL
CHECK / REPLACE D813 (BYV95C) D814 (BYV95C)
R824 (2W 43)
Q802 (KTC 3198Y)
Q803 (KTC 3198Y)
T801
NORMAL
CHECK / REPLACE I701
& SCL(PIN7) | OK |
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WAVEFORM OF I501 |
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| CHECK / REPLACE | |
CHECK / REPLACE |
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| T402 F.B.T | ||
I501(TDA8374A) |
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| & CRT | ||
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OK
40