HP vp17 Service Manual page 38

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