4-18
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 Valencia
-
Check if the LVDS cable is loose or not.
-
Diagnostics
Change the TU801 or
the main PCB assembly.
No
Yes
No video
Yes
Check the RF source and
check the connection of RF cable?
No
Input the RF signal.
Check the connected cable.
Yes
6
Does the signal appear at
pin11, 12 of TU801?
Yes
Check the LVDS cable?
Replace the LCD panel?
Please, contact Tech support.
No
Does the digital data appear at
pin 15~81 of CN1902?
No
Change the IC1101 or
the main PCB assembly.
5
Caution
Make sure to disconnect the power before working on the PD board.
Notice
Refer to the next page for detailed locations.
Summary of Contents for UN46C6900VF
Page 43: ...4 3 4 Troubleshooting ...
Page 53: ...4 13 4 Troubleshooting Location Main TOP CN401 IC901 Location Main BOTTOM ...
Page 54: ...4 14 4 Troubleshooting WAVEFORMS 1 2 PC Input V Sync H Sync 3 LVDS Out CLK ...
Page 56: ...4 16 4 Troubleshooting Location Main TOP CN1902 IC601 IC1101 Location Main BOTTOM ...
Page 59: ...4 19 4 Troubleshooting Location Main TOP TU801 IC1101 CN1902 Location Main BOTTOM ...
Page 60: ...4 20 4 Troubleshooting WAVEFORMS 5 Tuner CVBS Out Pattern Grey Bar 6 Eagle Out Clk H Sync ...
Page 62: ...4 22 4 Troubleshooting Location Main TOP TU801 IC1101 CN1902 Location Main BOTTOM ...
Page 63: ...4 23 4 Troubleshooting WAVEFORMS 5 Tuner CVBS Out Pattern Grey Bar 7 TS DATA Out Clk Data 0 ...
Page 65: ...4 25 4 Troubleshooting Location Main TOP R528 IC1101 CN1902 Location Main BOTTOM ...
Page 66: ...4 26 4 Troubleshooting WAVEFORMS 5 Tuner CVBS Out Pattern Grey Bar ...
Page 68: ...4 28 4 Troubleshooting Location Main TOP IC1101 CN1902 R503 R502 R501 Location Main BOTTOM ...
Page 69: ...4 29 4 Troubleshooting WAVEFORMS 5 Tuner CVBS Out Pattern Grey Bar 9 Component Input Y Pb ...
Page 71: ...4 31 4 Troubleshooting Location Main TOP CN407 IC1101 IC301 Location Main BOTTOM ...