No Video (Analog Pc Signal) - Samsung LN32A650A1F Service Manual

4-1-2. No Video (Analog PC signal)

Symptom Audio is normal but no picture is displayed on the screen.
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Check the PC source
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Major
Check the MST336CCLK, Check the Bayhill+
-
checkpoints
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
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Diagnostics
1
2
Caution Make sure to disconnect the power before working on the IP board.
Power Indicator is off.
Lamp(Backlight) Off, no video
Yes
Check the PC source and
check the connection of DSUB?
Yes
Does the signal appear at
#11,#10,#8,#4,#5
(R, G, B, H, V) of IC601?
Yes
Does the digital data appear at
output of R1308 ~R1321,
R1323~R1336?
Yes
Check the LVDS cable?
Replace the LCD panel?
Input an analog PC signal.
No
Check the connected cable.
Check CN101, PC cable.
No
Change the PC cable. Change the main
PCB assembly
No
Check IC1001 Change the main PCB
No
Please, Contact Tech support
4. Troubleshooting
assembly
4-3