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.
-
-
-
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
Summary of Contents for LN32B550K1F
Page 171: ...4 3 4 Troubleshooting BD102 BD108 BD106 BD106 R102 R171 R173 C122 R527 Pin 1 5 F1 ...
Page 173: ...4 5 4 Troubleshooting Pin 19 Pin 20 Pin 34 Pin 35 PCR PCG PCB PCH PCV ...
Page 174: ...4 6 4 Troubleshooting WAVEFORMS 1 PC input V sink H sink R G B 2 LVDS output ...
Page 176: ...4 8 4 Troubleshooting Pin 7 Pin 12 Pin 19 Pin 20 Pin 34 Pin 35 Pin 7 Pin 12 ...
Page 177: ...4 9 4 Troubleshooting WAVEFORMS 3 HDMI input RX_Data RX_Clk 2 LVDS output ...
Page 179: ...4 11 4 Troubleshooting Pin 19 Pin 20 Pin 34 Pin 35 Pin 8 Pin 2 Pin 4 ...
Page 180: ...4 12 4 Troubleshooting WAVEFORMS 4 CVBS OUT Grey Bar 2 LVDS output ...
Page 182: ...4 14 4 Troubleshooting Pin 19 Pin 20 Pin 34 Pin 35 Pin 2 Pin 4 ...
Page 183: ...4 15 4 Troubleshooting WAVEFORMS 2 LVDS output ...
Page 185: ...4 17 4 Troubleshooting R408 Pin 19 Pin 20 Pin 34 Pin 35 TP V2CVBS ...
Page 186: ...4 18 4 Troubleshooting WAVEFORMS 4 CVBS OUT Grey Bar 2 LVDS output ...
Page 188: ...4 20 4 Troubleshooting Pin 19 Pin 20 Pin 34 Pin 35 R725 R728 R727 R703 R702 R704 ...
Page 189: ...4 21 4 Troubleshooting WAVEFORMS 5 Compnent_Y Gray scale Pb Pr Color bar 2 LVDS output ...
Page 192: ...4 24 4 Troubleshooting WAVEFORMS 6 I2C Data 7 Speaker out ...
Page 212: ...6 6 6 Wiring Diagram Memo ...