Lenovo L215P Service Manual page 41

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
OK
Check the voltage of C907 (+)
Check start voltage for the pin8 of IC901
OK
Check the auxiliary voltage is bigger than
10V and smaller than 16V
Check IC901 pin5 PWM wave
OK
Check Q900, D921, D922, D910, ZD903, IC902 and IC903
NG
NG
OK
NG
OK
Check AC input
Check bridge rectified circuit and F901 circuit
Check R905, R919, R920,R921 and Check IC901
1) Check IC901
NG
2) Check IC901 over current protect circuit
NG
Check IC901
41
Lenovo L215P Wide