HP Pavilion VP17 Service Manual page 38

17" LCD Color Monitor
2. W/LED No Backlight
Check C811 (+) =12V
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
OK
Check the output of PT801/PT802
OK
Check connecter & lamp
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NG
OK
NG
OK
NG
OK
NG
OK
NG
OK
NG
NG
Check Q803
Check Interface board
Change Q801 or Q802
Change IC801
CheckQ805/Q806
Check Q805/Q806/D801/D803
Change PT801/PT802
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HP VP17