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NO Raster
(Lamp Off)
Check C811 (+)
=12V
YES
Check ON/OFF
signal
YES
CheckIC801 pin
2=5V?
YES
Check IC801
Pin1/pin15 have the
output of sawtooth
wave at short time
YES
Check Q805/Q806
pin5/pin8 is 12V?
YES
Check PT801/PT802
pin7/pin8= 650V?
Replace backlight
6. RASTER
NO
NO
NO
NO
NO
NO
YES
-22-
Check power section
Check Interface section or
main board
Check Q801 Q802 Q803
ZD801
Check IC801 pin 5/pin6
Replace IC801
Cut all the pin connector of
Q805/Q806, check C811 (+) =12V?
YES
NO
Replace Q805/Q806
Unplug backlight connector wire,
check PT801/PT802 pin7/pin8 =
650V?
Replace PT801/PT802
NO
Check Q801 Q802
NO
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