HCL HCM9LWAT11 Servise Manual page 36

19"W LCD Color Monitor
No backlight
Check the input voltage of 12V
OK
Check ON/OFF signal
OK
Check IC801 PIN2=12V
OK
OK
OK
OK
Check the output of PT801, PT802
OK
Check connecter & lamp, feedback and protect circuit
NG
NG
NG
Check IC801 PIN13 have triangle wave
NG
Check IC801 PIN1/PIN15 PWM wave
NG
Check Q805, Q806 Drain wave
NG
NG
Check adapter
Check Interface board or main board
Change on/off circuit
Change IC801
Check IC801
Change Q805, Q806
Change PT801, PT802
36
HCL HCM9LWAT11