4-10
4. Troubleshooting
4-1-4. No Video (Tuner_CVBS)
Symptom
Audio is normal but no picture is displayed on the screen.
-
Major
checkpoints
Check the Tuner CVBS source
Check the MSD237HCG.
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
-
-
Diagnostics
Change the Main Assy
BN94-02990A
No
Yes
Does the CVBS data appear at
#9 pin of Tuner?
No
Power indicator LED is off.
Lamp(Backlight) on, no video?
Yes
Check the RF source and
check the connection of RF cable?
No
Input the RF source properly.
Yes
Check Tuner
Change the Main Assy
BN94-02990A
Check the LVDS cable?
Replace the LCD panel?
Please, Contact Tech support
No
Does the DC TU5V_PW, TU33V_PW
appear at #3, #5 Pin of Tuner?
Does the digital data appear at
CN109 (LVDS Data clk)
of LVDS connector?
No
Check IC4010 (Saturn4)
Change the Main Assy
BN94-02990A
4
2
No
Check a set
in the ‘Stand-by mode’.
Yes
Yes
Caution
Make sure to disconnect the power before working on the IP board.
Summary of Contents for LA22B650T6M
Page 7: ...1 4 1 Precautions Memo ...
Page 15: ...4 3 4 Troubleshooting ...
Page 17: ...4 5 4 Troubleshooting ...
Page 18: ...4 6 4 Troubleshooting WAVEFORMS 1 PC input V sink H sink R G B 2 LVDS output ...
Page 20: ...4 8 4 Troubleshooting ...
Page 21: ...4 9 4 Troubleshooting WAVEFORMS 3 HDMI input RX_Data RX_Clk 2 LVDS output ...
Page 23: ...4 11 4 Troubleshooting ...
Page 24: ...4 12 4 Troubleshooting WAVEFORMS 4 CVBS OUT Grey Bar 2 LVDS output ...
Page 26: ...4 14 4 Troubleshooting ...
Page 27: ...4 15 4 Troubleshooting WAVEFORMS 2 LVDS output ...
Page 29: ...4 17 4 Troubleshooting ...
Page 30: ...4 18 4 Troubleshooting WAVEFORMS 4 CVBS OUT Grey Bar 2 LVDS output ...
Page 32: ...4 20 4 Troubleshooting ...
Page 33: ...4 21 4 Troubleshooting WAVEFORMS 5 Compnent_Y Gray scale Pb Pr Color bar 2 LVDS output ...
Page 35: ...4 23 4 Troubleshooting ...
Page 36: ...4 24 4 Troubleshooting WAVEFORMS 6 I2C Data 7 Speaker out ...