HCL HCMELWBT11 Service Manual page 31

18.5" LCD Color Monitor
No picture (LED orange)
No picture
The button if under
control
OK
Check C423(+) =1.8V;
U404 Vout=3.3V
OK
Check X401 oscillate
waveform is normal
OK
Check HS/VS from
CN101 is normal
OK
Replace U401
NG
X401 oscillate
waveform is normal
OK
Check reset circuit of
U401 is normal
OK
Replace U401
NG
Check CN404 or replace Q409,
Q410 and U404
NG
Replace X401
NG
Check Correspondent
component
31
HCL HCMELWBT11
NG
Replace X401
NG
Check Correspondent
component