No Video (Analog) - Samsung LS15HAA Service Manual

4-3 No Video (ANALOG)

Check signal cable connection and
power.
1
X400 oscillate properly?
Yes
Is there R, G, B input at
R101, R103 and R105?
Yes
Is there Hsync, Vsync waveform
3
2
at Pin 100, 1 of IC 400?
Yes
Is there Hsync, Vsync waveform
3
2
at Pin 41, 42 of IC 200?
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.
No
Replace or check related circuit.
No
Check input part.
No
Check IC400 and related circuit.
No
Check IC200 and related circuit.
No
Check IC400 and related circuit.
Check PANEL_EN SIGNAL at R236
No
is High(On:High) and BL_EN signal
at R605(ON:Low) is Low
4 Troubleshooting
4-3