Dell E1709Wc Service Manual page 45

17" LCD Color Monitor
9.2.2 Power/Inverter Board
1.) No power
Check CN902 pin4, 5 = 12V
NG
Check AC line volt 110V or 220V
OK
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 Q901, FB901, D900, ZD921, ZD922, D915, D916, IC903 and T901
NG
OK
NG
OK
OK
OK
Check AC input
NG
Check bridge rectified circuit and F901 circuit
Check R904, R932, R933 and Check IC901
NG 1) Check IC901
2) Check IC901 over current protect circuit
NG
Check IC901
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Dell E1709Wc