Trouble Shooting - Dell S1709Wc Service Manual

17" LCD Color Monitor

9.2 Trouble shooting

9.2.1 Main Board
No power
Measure U404 PIN2= 3.3V
C423(+)= 1.8V
NG
OK
X401 oscillating waveform is
normal
NG
OK
Reset signal is normal
NG
OK
Replace U401
Measure CN404
PIN3、4= 5.6V
NG
OK
Check U404, Q409, Q410
Check X401, C411, C412
Check R401, R402
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Dell S1709Wc
Check power section