LG Flatron W1941S - Troubleshooting: Raster;Lamp

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6. RASTER
NO Raster
(Lamp Off)
Check C811 (+)
=
12V
Check ON/OFF
si
g
nal
CheckIC801 pin
2=5V?
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Check Q805/Q806
pin5/pin8 is 12V?
Check power section
Check Interface section or
main board
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Check Q801 Q802 Q803
ZD801
Check IC801 pin 5/pin6
Cut all the pin connector of
Q805/Q806, check C811 (+) =12V?
Unplug backlight connector wire,
check PT801/PT802 pin7/pin8 =
650V?
Replace PT801/PT802
NO
NO
NO
NO
NO
YES
YES
YES
Check IC801
Pin1/pin15 have the
output of sawtooth
Check PT801/PT802
pin7/pin8= 650V?
Replace Q805/Q806
Check Q801 Q802
Replace backlight
Replace IC801
NO
YES
NO
YES
YES
NO
YES
NO
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