Samsung LN32A550P3R Service Manual page 94

4-1-4. No Video (Tuner_CVBS)
Symptom Audio is normal but no picture is displayed on the screen.
-
- Check the Tuner CVBS source
Major
Check the MT8226
-
checkpoints
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
Diagnostics
8
6
7
Caution Make sure to disconnect the power before working on the SMPS / 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 TU3001?
Yes
Does the digital data appear at output
of RA5070~RA5075?
Yes
Does the digital data appear at output
of RA6074~RA6076, RA6078~RA6080,
R6082_P, R6083_P, R6086_P,
R6087_P?
Yes
Check the LVDS cable?
Replace the LCD panel?
No
Input the RF signal.
Check the connected cable.
No
Check TU3001.
Change the main PCB assembly or tuner.
Check IC5004
No
Change the main PCB assembly
No
Check IC6001_FBE
Change the main PCB assembly
No
Please, Contact Tech support
4. Troubleshooting
4-7