Samsung LN40A550P3F - No Video (Tuner_Cvbs)

4-10
4. Troubleshooting
4-1-5. 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 MT5382
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 TU301
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 IC400
Change the main PCB assembly
Yes
Check the LVDS cable?
Replace the LCD panel?
Please, Contact 1 800 Samsung
No
Does the digital data appear at output
of R721~R740, R788~R791?
Does the digital data appear at output
of R1109, R1110, R1113P, R1114P,
R1116P, R1120P, R1122~R1128,
R1133, R1135, R1137P~R1141P,
R1143~R1150?
No
Check IC1101
Change the main PCB assembly
8
6
7
Does the signal appear at TU301?
Caution Make sure to disconnect the power before working on the IP board.