Iiyama PLE1702WS Service Manual page 37

17" LCD Color Monitor
2.) No Backlight
Check F801=12V
OK
Check ON/OFF signal
OK
Check IC801 PIN12=10.5V
OK
OK
OK
OK
Check the output of T801
OK
Check connecter & lamp, feedback and protect circuit
NG
NG
NG
Check IC801 PIN5 have triangle wave
NG
Check IC801 PIN9/PIN10 PWM wave
NG
Check Q802 Drain wave
NG
NG
Check adapter and F801
Check Interface board or main board
Change on/off circuit
Change IC801
Check IC801
Check Q801/Q804/Q811/Q812
Change T801
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Iiyama PLE1702WS