No Video (Analog) - Samsung 940BW Service Manual

4 Troubleshooting

4-2 No Video (ANALOG)

Check signal cable connection and
power.
1
X1 oscillate proprely?
Yes
Is there R,G,B input at
R111,R114 and R118?
Yes
Is there Hsync, Vsync waveform
2 3
at Pin 32,33 of IC604?
Yes
Does the output signal appear
at Pin 17~20, 22~27 of CN400?
Yes
There are DC 5V at Pin 1,
2 and 3 of CN400?
Yes
Replace LCD Panel.
4-2
No
Replace or check related circuit.
No
Check input part.
No
Check IC604 and related circuit.
No
Check CN400 and related circuit.
Check PANEL_EN SIGNAL at R223
No
is High(On:High) and BL_EN signal
at R601(ON:Low) is Low