Hanns.G HSD HG191D Service Manual page 40

19" LCD Color Monitor
2. W/LED No Backlight
Check C811 (+) =12V
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
Check the output of PT801/PT802
Check connecter & lamp
OK
Check ON/OFF signal
OK
Check IC801 PIN2=5V
OK
OK
OK
OK
NG
Check adapter circuit
NG
Check Interface board
NG
Check Q801,Q802,Q803
NG
NG
Check Q805,Q806,PT801,PT802
NG
Check C816, C841 or C834, C837
Change PT801 or PT802
40
HSD HG191D
Check IC801