BenQ E2400HD - 24" LCD Monitor, Service Manual

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24” LCD Color Monitor BenQ E2400HD
47
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 100-240V is normal
Reinsert or check the
power section
Check if X401 oscillate waveforms are normal
Measure U701 Pin2=3.3V, U702 Pin2=1.8V
OK
OK
NG
NG
NG
Replace U701, U702
Check U401
Replace X401
OK
NG
Check if the Pin 3, 4 of CN701 are 5V input
Check power board
NG
OK