Buffalo FTD-W932HSR/WH Service Manual page 35

19" LCD Color Monitor
2.) No Backlight
Check F801=12V
Check ON/OFF signal
Check IC801 PIN12=12V
Check the output of T801, T802
Check connecter & lamp, feedback and protect circuit
NG
OK
NG
OK
NG
OK
Check IC801 PIN5 have triangle wave
NG
OK
Check IC801 PIN9/PIN10 PWM wave
NG
OK
Check Q802, Q803 Drain wave
NG
OK
NG
OK
Check adapter and F801
Check Interface board or main board
Change ON/OFF circuit
Change IC801
Check IC801
Change Q802.Q803
Change T801, T802
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Buffalo FTD-W932HSR