17" LCD Color Monitor HP VP17
38
2. W/LED No Backlight
Check C811 (+) =12V
NG
OK
Check Q803
Check ON/OFF signal
Check Interface board
NG
OK
Check IC801 pin2=5V ?
NG
OK
Change Q801 or Q802
Check the pin1 of IC801 have saw tooth wave
NG
OK
Change IC801
Check D801 (-) has the output of square wave at short time.
NG
OK
CheckQ805/Q806
Check the resonant wave of pin2 & pin5 for PT801/ PT802
NG
Check the output of PT801/PT802
Check Q805/Q806/D801/D803
Check connecter & lamp
OK
NG
Change PT801/PT802
OK
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