20” LCD Color Monitor BenQ G2020HDA
48
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
Check if X401 oscillate waveforms are normal
Measure U201 Pin2=3.3V
OK
OK
NG
NG
NG
Replace U201
Check U401
Replace X401
OK
NG
Check if the Pin 3, 4 of CN201 is 5V input
Check power board
NG
OK
