Samsung LN32B550K1F Service Manual page 175

4-1-4. No video (HDMI1, 2, 3, 4 - Digital signal)
Symptom Audio is normal but no picture is displayed on the screen.
-
Check the HDMI source.
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Major
Check the HDMI switch, Check the Chelsea.
-
checkpoints
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
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3
Diagnostics
3
2
Caution Make sure to disconnect the power before working on the IP board.
Power Indicator is off.
Lamp(Backlight) Off, no video?
Yes
Check the HDMI source and check
the connection of HDMI cable?
Yes
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)?
Yes
Does the digital data appear at
IC402(Pin #27, #23)
(HDMI RX_Clk , RX_Data)?
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 HDMI signal properly
Check CN901,CN902,CN802
CN711_550 Check HDMI cable
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
Check IC402 (HDMI switch)
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
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
4-7