No Video (Digital) - Samsung 940Fn Service Manual

4 Troubleshooting

4-3 No Video (Digital)

check signal cable connection
and power
Do X401,X901 oscillate
like as figure 1 properly?
1
Yes
Is there R,G,B input at
R126 ~ R131 like as figure
4,5,6?
Yes
Is there waveform figure 7
at R132,R133,R140,R141?
Yes
Does the output signal appear at Pin
17 ~ 20, 22 ~ 27 of CN400?
Yes
Does DC 5V appear at pin
28,29,30 of CN400?
Yes
Replace LCD Panel.
4-4
No
No
4 5 6
7
No
No
No
Replace or check related circuit
check input part
check input part
check IC 400 and related circuit
check the panel_En signal and
BL_En signal and related circuit