Samsung LN40A330J1D - No Video (Tuner_Cvbs)

4-7
4. Troubleshooting
4-1-4. No Video (Tuner_CVBS)
Symptom Audio is normal but no picture is displayed on the screen.-
Major
checkpoints
Check the Tuner CVBS source
Check the MSD2248AL
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
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-
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Diagnostics
Check TU5001
Change the main PCB assembly or tuner.
No
Yes
No
Yes
Power Indicator is off.
Lamp(Backlight) Off, no video
Yes
Check the RF source and
check the connection of RF cable?
No
Input the RF signal.
Check the connected cable.
Yes
Check IC3001
Change the main PCB assembly
Yes
Check the LVDS cable?
Replace the LCD panel?
Please, Contact Tech support
No
Does the digital data appear at output
of R5006~R5020, R5022~R5029?
Does the digital data appear at output
of R3082F~R3095F?
No
Check IC4001
Change the main PCB assembly
8
6
7
Does the signal appear at TU5001?
Caution Make sure to disconnect the power before working on the IP board.