19"W LCD Color Monitor HCL HCM9LWAN21
34
No backlight
Check the input voltage of 12V
NG
OK
Check adapter and F101
Check ON/OFF signal
Check Interface board or main board
NG
OK
Check U811 PIN2=12V
NG
OK
Change on/off circuit
Check U811 PIN13 have triangle wave
NG
OK
Change U811
Check U811 PIN1/PIN15 PWM wave
NG
OK
Check U811
Check Q821, Q841 Drain wave
NG
Check the output of PT801, PT802
Change Q821, Q841
Check connecter & lamp, feedback and protect circuit
OK
NG
Change PT801, PT802
OK
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