No Video (Tuner_Cvbs) - Samsung LN32A450C1D 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 MSD2248AL
-
checkpoints
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
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Diagnostics
8
6
7
Caution Make sure to disconnect the power before working on the IP board.
Power Indicator is off.
Lamp(Backlight) Off, no video
Yes
Check the RF source and
check the connection of RF cable?
Yes
Does the signal appear at TU5001?
Yes
Does the digital data appear at output
of R5006~R5020, R5022~R5029?
Yes
Does the digital data appear at output
of R3082F~R3095F?
Yes
Check the LVDS cable?
Replace the LCD panel?
No
Input the RF signal.
Check the connected cable.
No
Check TU5001
Change the main PCB assembly or tuner.
Check IC3001
No
Change the main PCB assembly
No
Check IC4001
Change the main PCB assembly
No
Please, Contact Tech support
4. Troubleshooting
4-7