HP W19E Service Manual page 38

19" LCD Color Monitor
2. W/LED No Backlight
Check C811 (+) =12V
Check IC801 PIN2=5V, Pin9=12V voltage of C905(+)
Check the Pin1, Pin15 of IC801 have square wave
Check Q805,Q806 have the output of
square wave at short time.
Check the resonant wave of Pin7 & Pin8 for PT801/PT802
OK
Check the output of PT801/PT802
Check connecter & lamp
OK
Check ON/OFF signal
OK
OK
OK
OK
NG
Check adapter circuit
NG
Check Interface board
Check Q801,Q802,Q803
NG
NG
Check Q805,Q806,PT801,PT802
NG
Check C816, C841 or C834, C837
NG
Change PT801 or PT802
38
Check IC801
HP W19E