Samsung LN32A550P3R Service Manual page 98

4-1-6. No Video (S-Video)
Symptom Audio is normal but no picture is displayed on the screen.
-
- Check the S-Video source
Major
Check the MT8226
-
checkpoints
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
Diagnostics
9
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 video source and
check the connection of
video cable?
Yes
Does the signal appear
at R3204_NSIDE ~ R3206_NSIDE?
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?
Input a video signal.
No
Check the connected cable.
Check Side-AV
No
Change the main PCB ass'y or
Side-AV assembly
Check IC5004
No
Change the main PCB assembly
Check IC6001_FBE
No
Change the main PCB assembly
No
Please, Contact Tech support
4. Troubleshooting
4-11