BenQ E2400HD - 24" LCD Monitor, Service Manual

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24” LCD Color Monitor BenQ E2400HD
50
Power Board
No power
Check CN902 PIN5.6 = 5V
Check AC line volt 110V or 220V
Check AC input
Check the voltage of C905 (+)
Check bridge rectified circuit and F901 circuit
Check start voltage for the pin8 of IC901
Check R904, R905, Change IC901
NG
Check the auxiliary voltage is bigger than
10V and smaller than 20V
1) Check IC901
2) Check R909/D901/C908 circuit
OK
OK
NG
Check D908/D906/D907/ZD921/ZD922/Q903/ZD902
OK
Check IC901 pin5 PWM wave
OK
Check IC901
NG
NG
NG OK
NG