15.6" LCD Color Monitor HCL HCMDLWBT21&HCMDLWBN21
31
No picture (LED orange)
No picture
The button if under control
Replace the key button
Measure CN201 PIN3, 4=5V,
U201 PIN2=3.3V
Replace U501
X401 oscillate waveform is
normal
Replace CN201 or U201
OK
OK
OK
OK
NG
NG
Check HS/VS from CN301 is
normal
Replace X401
Check Correspondent component
NG
NG
Measures U401, U403 are
normal
OK
NG
Replace U401, U403
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