Lenovo LXH-GJ17L3 Service Manual page 37

17" LCD Color Monitor
8.2.2 Power/Inverter Board
No power
Check CN102 pin 5/6 = 12V
Check AC line volt 110V or 220V
Check the voltage of C904 (+)
Check start voltage for the pin7 of IC901
Check the auxiliary voltage is bigger than
10V and smaller than 20V
Check IC901 pin 6 PWM wave
Check T901, D911, IC902, IC903, IC905
NG
NG
OK
OK
NG
OK
OK
OK
Check AC input
NG
Check bridge rectified circuit and F901 circuit
Check R908, R909, R910 and Change IC901
NG 1) Check IC901
2) Check T901, Q901
NG
Check IC901
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Lenovo LXH-GJ17L3