Power Board Troubles - Asus VW223 Service Manual

Service Manual
8.2.2 Power Board
1) No power
Check AC line volt 110V or 220V
Check the voltage of CK1
Check start voltage for the pin5 of U1
Check the auxiliary voltage is bigger than
10V and smaller than 20V
Check U1 pin6 PWM wave
OK NG
OK
NG
OK NG
NG
OK
OK
NG
Check Q1
Check AC input
Check bridge rectified circuit and FS1 circuit
Check RX4, RX5, RX6, Change U1
1) Check U1
2) Check R906/D908 circuit
Check U1
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ASUS VW223