Main Board Troubleshooting; No Power - BenQ G900WA Service Manual

19" LCD Color Monitor
Main Board

(1) No Power

No power
Press power key and look if the
picture is normal
NG
Please reinsert and make sure the
AC of 100-240 is normal
OK
Measure U201 Pin2=3.3V
NG
OK
X401 oscillate waveforms are
normal
NG
OK
Check U401
OK
Replace U501
NG
Reinsert or check the
power section
Replace U201
Replace X401
NG
Replace U401
36
BenQ G900WA