Samsung LN32B550K1F Service Manual page 187

4-1-8. No video (Component 1, 2)
Symptom Audio is normal but no picture is displayed on the screen.
-
Check the Component source
-
Major
Check the chelsea.
-
checkpoints
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
Diagnostics
5
2
Caution Make sure to disconnect the power before working on the IP board.
Power indicator LED is off.
Lamp(Backlight) on, no video?
Yes
Check the component source and
check the connection of
component cables(Y,Pb,Pr)?
Yes
Does the component data appear at
R725, R727, R728
(Comp1 / Y, Pb, Pr)
R702, R703, R704
(Comp2 / Y, Pb, Pr)?
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'.
Input the component
No
source properly.
Check CN701
Change the Main Assy
550 32" : BN94-02518A
550 37" : BN94-02518B
550 40" : BN94-02518A
No
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
No
550 37" : BN94-02518B
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
4. Troubleshooting
Check a set
4-19