Samsung LN40A550P3F - No Video (HDMI - Digital Signal)

4-7
4. Troubleshooting
4-1-4. No Video (HDMI - Digital Signal)
Symptom Audio is normal but no picture is displayed on the screen.-
Major
checkpoints
Check the HDMI source
Check the MT5382
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
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Diagnostics
Check JA1000,JA1002, HDMI cable.
Change the HDMI 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(Backlight) Off, no video
Yes
Check the HDMI source and check
the connection of HDMI cable?
No
Input an HDMI 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 signal appear at
R1027, R1029, R1034, R1036, R1040,
R1042, R1063, R1065, R1067, R1069,
R1071, R1073(DATA), R1020,
R1023, R1059, R1061(Clk+/-)?
Does the digital data appear at output
of R1034-7, R1039, RA061~063,
RA065, RA067, RA068?
No
Check IC1101
Change the main PCB assembly
4
5
6
Caution Make sure to disconnect the power before working on the IP board.