4-12
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 Tuner, Check the Chelsea.
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
-
-
Diagnostics
Change the Main Assy
No
Yes
Does the CVBS data appear at
#8 pin of Tuner?
No
Yes
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
Yes
Check the LVDS cable?
Replace the LCD panel?
Please, Contact Tech support
No
Does the DC B33V_Tuner, B5V_Tuner
appear at #4, #2 Pin of Tuner
Does the digital data appear at
R1030F (FRC_M_HSYNC)
Pin #19,20,34,35 (LVDS Data clk)of
LVDS connector?
No
Check IC601 (Chelsea)
Change the Main Assy
4
2
No
Check a set
in the ‘Stand-by mode’.
Caution
Make sure to disconnect the power before working on the IP board.
Summary of Contents for LA32B650T1R
Page 28: ...1 4 1 Precautions Memo ...
Page 61: ...4 9 4 Troubleshooting WAVEFORMS 1 PC input V sink H sink R G B 2 LVDS output ...
Page 63: ...4 11 4 Troubleshooting WAVEFORMS 3 PC input V sink H sink R G B 2 LVDS output ...
Page 65: ...4 13 4 Troubleshooting WAVEFORMS 4 CVBS OUT Grey Bar 2 LVDS output ...
Page 67: ...4 15 4 Troubleshooting WAVEFORMS 4 CVBS OUT Grey Bar 2 LVDS output ...
Page 69: ...4 17 4 Troubleshooting WAVEFORMS 5 Compnent_Y Gray scale Pb Pr Color bar 2 LVDS output ...
Page 71: ...4 19 4 Troubleshooting WAVEFORMS 6 I2C Data 7 Speaker out ...
Page 85: ...4 33 4 Troubleshooting 5 Press 0 6 Save latest BSP images to update folder in usb memory ...
Page 86: ...4 34 4 Troubleshooting 7 Enter bbm usb after connecting usb memory 8 Press 1 ...
Page 87: ...4 35 4 Troubleshooting 9 Enter u boot bin 10 Press x to return prompt menu ...