Samsung LN32B550K1F Service Manual page 184

4. Troubleshooting
4-1-7. No Video (Video CVBS 1, 2)
Symptom Audio is normal but no picture is displayed on the screen.
-
Check the Video CVBS source
-
Major
Check the Chelsea.
-
checkpoints
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
Diagnostics
4
2
Caution Make sure to disconnect the power before working on the IP board.
4-16
Power indicator LED is off.
Lamp(Backlight) on, no video?
Yes
Check the video source and
check the connection of video cable?
Yes
Does the CVBS data appear at
R408(AV1), TP - V2CVBS(AV2)?
Yes
Does the digital data appear at
Pin #19,20,34,35 (LVDS Data clk)
of LVDS connector?
Yes
Check the LVDS cable?
Check the T-Con B'd?
Replace the LCD panel?
No
in the 'Stand-by mode'.
No
Input the video source properly.
Check CN701 or CN805
Change the Main Assy
550 32" : BN94-02518A
550 37" : BN94-02518B
No
550 40" : BN94-02518A
550 46" : BN94-02518D
550 52" : BN94-02518E
540 40" : BN94-02510A
540 46" : BN94-02510B
540 52" : BN94-02510C
Check IC201 (Saturn4)
Change the Main Assy
550 32" : BN94-02518A
550 37" : BN94-02518B
No
550 40" : BN94-02518A
550 46" : BN94-02518D
550 52" : BN94-02518E
540 40" : BN94-02510A
540 46" : BN94-02510B
540 52" : BN94-02510C
No
Please, Contact Tech support
Check a set