No Video (Video Cvbs) - Samsung LN32A550P3F Service Manual

4. Troubleshooting

4-1-7. No Video (Video CVBS)

Symptom Audio is normal but no picture is displayed on the screen.
-
Check the Video CVBS source
-
Major
Check the MT5382
-
checkpoints
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
Diagnostics
6
6
7
Caution Make sure to disconnect the power before working on the SMPS board.
4-16
Power Indicator is off.
Lamp on, no video
Yes
Check the video source and
check the connection of
video cable?
Yes
Does the signal appear at
C702 of IC400?
Yes
Does the digital data appear at output
of R721~R740,R788~R791?
Yes
Does the digital data appear at output
of R1109, R1110, R1113P, R1114P,
R1116P, R1120P, R1122~R1128,
R1133, R1135, R1137P~R1141P,
R1143~R1150?
Yes
Check the LVDS cable?
Replace the LCD panel?
Input a video signal.
No
Check the connected cable.
Check CN7002 or Side-AV
No
Change the main PCB ass'y or
Side-AV assembly
No
Change the main PCB assembly
No
Change the main PCB assembly
No
Please, Contact 1 800 Samsung
Check IC400
Check IC400