LG Flatron W2243T - Raster and Backlight Issues

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6. RASTER
Unplug backlight connector wire,
check PT801 pin7/pin8 = 650V?
Replace PT801
NO
NO
YES
Check PT801
pin7/pin8= 650V?
Replace backlight
Check Q805/Q806
pin5/pin8 is 16V?
Cut all the pin connector of
Q805/Q806, check C804 (+) =16V?
Replace Q805/Q806
Check C808, C809,
C810
Replace IC801
NO
NO Raster
(Lamp Off)
Check C804 (+)
=
1
6
V
Check ON/OFF
signal
CheckIC801 pin
11=5V?
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Check power section
Check Interface section or
main board
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Check C808, C809, C810
Check IC801 pin 1/pin 14
NO
NO
NO
YES
YES
Check IC801
Pin8/pin9 have the
output of sawtooth
YES
NO
YES
YES
NO
YES
NO
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