HCL HCM9LWAN21 - Troubleshooting Guide; Main Board Troubleshooting

19"W LCD Color Monitor HCL HCM9LWAN21
30
8.2 Trouble Shooting
8.2.1 Main Board
No power
No power
Press power key and look
if the picture is normal
Please reinsert and make sure
the AC of 100V-240V is normal
Measure CN201 PIN5=5V,
U201 PIN2=3.3V
Reinsert or check the
Adapter/Inverter section
X401 oscillate waveforms are
normal
Check CN201 or U201
Replace U501
Replace X401
OK
OK
OK
NG
NG
NG
NG
OK
Measures U401 is normal
NG
Replace U401