Lenovo LXM-L19BH Service Manual page 31

8.2.3 POWER/INVERTER BOARD
1.) No power
Check to CN102 pin12 = 12V
Check the voltage of C905(+)
Check start voltage for the pin3 of IC901
Check the auxiliary voltage is smaller than 20V
Check D910, D912, IC902, IC903
NG
OK
NG
OK
NG
OK
NG
OK
Check Interface board
NG
Check AC line volt 120V or 220V
Change F901; check BD901, Q903, and IC901
Check R906, R907, IC901
1) Check IC902, IC903, ZD901
2) Check Q901, Q902...OVP circuit
Page 31 of 44
Lenovo LXM-L19BH