Samsung LN52B550K1F - No Video (HDMI1, 2, 3, 4 - Digital signal)

4-7
4. Troubleshooting
4-1-4. No video (HDMI1, 2, 3, 4 - Digital signal)
Symptom Audio is normal but no picture is displayed on the screen.-
Major
checkpoints
Check the HDMI source.
Check the HDMI switch, 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
Caution Make sure to disconnect the power before working on the IP board.
Check CN901,CN902,CN802
CN711_550 Check HDMI 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
No
Power Indicator is off.
Lamp(Backlight) Off, no video?
No
Check the HDMI source and check
the connection of HDMI cable?
Yes
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?
Does the signal appear at
CN901 (Pin#12 , #7 )(HDMI1)
CN902 (Pin#12 , #7 )(HDMI2)
CN711_550(Pin#12 , #7 )(HDMI3)
CN802 (Pin#12 , #7 )(HDMI4)
(HDMI RX_Clk , RX_Data)?
No
Does the digital data appear at
IC402(Pin #27, #23)
(HDMI RX_Clk , RX_Data)?
No
Please, Contact Tech support
Check the LVDS cable?
Check the T-Con B’d?
Replace the LCD panel?
Input the HDMI signal properly
Yes
Yes
3
2
Check a set
in the ‘Stand-by mode’.
Check IC402 (HDMI switch)
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
3
Yes