Trouble Shooting - HCL HCM9LWAN21 Service Manual

19"W LCD Color Monitor

8.2 Trouble Shooting

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