Samsung LN32B550K1F Service Manual page 178

4. Troubleshooting
4-1-5. No Video (Tuner_CVBS)
Symptom Audio is normal but no picture is displayed on the screen.
-
Check the Tuner CVBS source.
-
Major
Check the Tuner, 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.
4-10
Power indicator LED is off.
Lamp(Backlight) on, no video?
Yes
Check the RF source and
check the connection of RF cable?
Yes
Does the DC TU5V_PW, TU33V_PW
appear at #2, #4 Pin of Tuner?
Yes
Does the CVBS data appear at
#8 pin of Tuner?
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 RF source properly.
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 Tuner 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
No
550 32" : BN94-02518A
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
Check a set