BenQ G2200W Service Manual page 36

22" LCD Color Monitor
Power/Inverter Board
No power
Check CN902 PIN5.6 = 12V
Check AC line volt 110V or 220V
Check the voltage of C905 (+)
Check start voltage for the pin8 of IC901
Check the auxiliary voltage is bigger than
10V and smaller than 20V
Check IC901 pin6 PWM wave
Check D905/D906/IC903/ZD921/ZD922/Q903
NG
OK
NG
OK NG
NG
OK
NG
OK
OK NG
Check AC input
Check bridge rectified circuit and F901 circuit
Check R904, R932, R933, Change IC901
1) Check IC901
2) Check R909/D901 circuit
Check IC901
36
BenQ G2200W