No Video (Analog Pc Signal) - Samsung LN32A550P3R Service Manual

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

Symptom Audio is normal but no picture is displayed on the screen.
-
- Check the PC source
Major
Check the MT8226
-
checkpoints
- This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
Diagnostics
1
2
3
Caution Make sure to disconnect the power before working on the SMPS / IP Board 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
#B9, #B10, #A11, #D12, #C11
(R,G,B,H,V) of IC5004?
Yes
Does the digital data appear at
output of RA5070~RA5075?
Yes
Does the digital data appear at output
of RA6074~RA6076, RA6078~RA6080,
R6082_P, R6083_P, R6086_P,
R6087_P?
Yes
Check the LVDS cable?
Replace the LCD panel?
Input an analog PC signal.
No
Check the connected cable.
Check CN3009, PC cable.
No
Change the PC cable. Change the main
PCB assembly
No
Check IC5004Change the main PCB
No Check IC6001_FBE
Change the main PCB assembly
No
Please, Contact Tech support
4. Troubleshooting
assembly
4-3