Trouble Shooting - Lenovo L172 Service Manual

17" LCD Color Monitor

8.2 Trouble Shooting

8.2.1 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
NG
OK
Measure U701 Pin2=3.3V,
U702 Pin2=1.8V?
NG
OK
X401 oscillate waveforms are
normal
NG
OK
Replace U401
Reinsert or check the
power section
Replace U701, U702
Replace X401
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Lenovo L172