Samsung LN40A550P3F - No Video (Tuner DTV)

4-13
4. Troubleshooting
4-1-6. No Video (Tuner DTV)
Symptom Audio is normal but no picture is displayed on the screen.-
Major
checkpoints
Check the DTV 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
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 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?
No
Check IC400
Change the main PCB assembly
6
Yes
Does the digital data appear at output
of R1109, R1110, R1113P, R1114P,
R1116P, R1120P, R1122~R1128,
R1133, R1135, R1137P~R1141P,
R1143~R1150?
No
Check IC400
Change the main PCB assembly
7
Caution Make sure to disconnect the power before working on the IP board.