Acer AL1951 - Chapter 3 Troubleshooting; No power

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Troubleshooting
This chapter provides troubleshooting information for the AL1951:
1. No power
Cha
p
ter 3
No power
Press power key and loo
k
if the picture is normal
Measure 12V input voltage
Check the adapter
section
X402 oscillate waveform
is normal
Measure U702 PIN2=5V?
OK
OK
NG
NG
NG
Replace U702
Replace U402
Replace X402
OK
Replace U401
NG
NG
NG