Samsung LN52B550K1F - No Video (Tuner DTV)

4-13
4. Troubleshooting
4-1-6. No Video (Tuner DTV)
Symptom Audio is normal but no picture is displayed on the screen.-
Major
checkpoints
Check the DTV source.
Check the Tuner, Check the Chelsea.
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
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-
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Diagnostics
No
Check the D-TV source.
No
Does the DC TU5V_PW, TU33V_PW
appear at #2, #4 Pin of Tuner?
Power indicator LED is off.
Lamp(Backlight) on, no video
No
Check the connection of RF cable
Change the Main Assy
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
Yes
Check IC201 (Saturn4)
Change the Main Assy
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
No
Does the digital data appear at
Pin #19,20,34,35 (LVDS Data clk)
of LVDS connector?
Check the ‘signal strength’
in Self Diagnosis menu
Strength is enough?
No
Please, Contact Tech support
Check the LVDS cable?
Check the T-Con B’d?
Replace the LCD panel?
Yes
Yes
Input the RF cable properly.
Yes
Yes
2
Check a set
in the ‘Stand-by mode’.
Caution Make sure to disconnect the power before working on the IP board.