LG Flatron W1943TB Service Manual page 23

NO Raster
(Lamp Off)
Check C811 (+)
=14.5V
YES
Check ON/OFF
signal
YES
CheckIC801 pin
2=5V?
YES
Check IC801
Pin1/pin15 have the
output of sawtooth
YES
Check Q806 pin5,
pin6 is 14.5V?
YES
Check PT801
pin7/pin8= 650V?
Replace backlight
6. RASTER
NO
Check power section
NO
Check Interface section or
main board
NO
Check C807, C809, C810
NO
Check IC801 pin 5/pin6
NO
Cut all the pin connector of Q806,
check C811 (+) =14.5V?
YES
Replace Q806
NO
Unplug backlight connector wire,
check PT801 pin7/pin8 = 650V?
YES
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NO
Replace IC801
Check C807, C809,
NO
C810
NO
Replace PT801