No Video (Tuner_Cvbs) - Samsung LE32A457C1D Service Manual

4-1-4. No Video (Tuner_CVBS)

Symptom Audio is normal but no picture is displayed on the screen.
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Check the Tuner CVBS source
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Major
Check the SEMS01
-
checkpoints
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
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Diagnostics
1
2
Caution Make sure to disconnect the power before working on the SMPS/IP.
Power Indicator is off.
Lamp on, no picure.
Yes
Does the signal appear at L3001?
Yes
Does the signal appear at R3169
of IC2601?
Yes
Check the LVDS cable?
Replace the LCD panel?
No
Connect the RF cable and
check RF signal.
No
Check a B+ voltage (#3 of Tuner) 5V,
change a main PCB ass'y.
No
Change a main PCB ass'y.
No
Please, Call to Samsung Co. LTD.
4. Troubleshooting
4-7