Lenovo L222 Wide Service Manual page 33

22" LCD Color Monitor
8.2.2 Power/Inverter Board
1.) No power
Check CN902 pin6 = 12V
NG
Check AC line volt 110V or 220V
Check the voltage of C907 (+)
Check start voltage for the pin8 of IC901
Check the auxiliary voltage is bigger than
10V and smaller than 20V
Check IC901 pin5 PWM wave
Check D910, Q900, D900, IC902, F902, ZD921, ZD922, D915, D916
NG
OK
OK
NG
OK
OK
OK
Check AC input
NG
Check bridge rectified circuit and F901 circuit
Check R905 and Change IC901
NG
1) Check IC901
2) Check R910, D901 circuit
NG
Check IC901
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Lenovo L222 Wide