Samsung LN40A550P3F - No Video (Analog PC Signal)

4-5
4. Troubleshooting
4-1-3. No Video (Analog PC signal)
Symptom Audio is normal but no picture is displayed on the screen.-
Major
checkpoints
Check the PC 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 CN1000, PC cable.
Change the PC cable. Change the main
PCB assembly
No
Yes
Does the digital data appear at
output of R721~R740,R788~R791?
No
Yes
Power Indicator is off.
Lamp on, no video
Yes
Check the PC source and
check the connection of DSUB?
No
Input an analog PC signal.
Check the connected cable.
Yes
Check IC400
Change the main PCB assembly
Check the LVDS cable?
Replace the LCD panel?
Please, Contact 1 800 Samsung
No
Does the signal appear at
#AE18,#AE17,#AF16,#AC16,#AB17
(R, G, B, H, V) of IC400?
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
1
2
3
Yes
Caution Make sure to disconnect the power before working on the IP board.