Asus VK266H Service Manual page 95

Service Manual
11.2 Power/Inverter Board
1.) No power
Check CN902 pin3, 4 = 14V
Check AC line volt 110V or 220V
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 Q900, D901, IC902, IC903, D915, D916, ZD921, ZD922
NG
NG
OK
Check the voltage of C907 (+)
OK
OK
OK
OK
Check AC input
NG
Check bridge rectified circuit and F901 circuit
NG
Check R905 and Change IC901
NG 1) Check IC901
2) Check R910, D901 circuit
NG
Check IC901
95
ASUS VK266H&VW266H