HP W17q - Trouble Shooting; Main Board

17" LCD Color Monitor HP W17q
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9.2 Trouble Shooting
9.2.1 Main Board
1、No power
No power
Press power key and look if the
picture is normal
Please reinsert and make sure the
AC of 100-240 is normal
Reinsert or check the
power section
X401 oscillate waveforms are
normal
Measure U201 PIN 2=3.3V
Q202 C = 3.3V
Measure CN301 PIN9/10=5V?
Replace U401
Replace X401
OK
OK
OK
NG
NG
NG
NG
Chec
TXD
Check power section
Replace U201/Q202
Replace U501
OK