HCL HCM9LWAN21 - Page 31

19"W LCD Color Monitor HCL HCM9LWAN21
31
No picture (LED orange)
No picture
The button if under control
Replace the key button
Measure CN201 PIN5=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 is normal
OK
NG
Replace U401