
4-25
4. Troubleshooting
4-1-6. No Video (Video CVBS)
Symptom
Audio is normal but no picture is displayed on the screen.
-
Major
checkpoints
Check the Video CVBS source
-
Check the Valencia
-
Check if the LVDS cable is loose or not.
-
Diagnostics
Yes
Check the LVDS cable?
Replace the LCD panel?
Please, contact Tech support.
No
Does the digital data appear at
pin 15~81 of CN2101?
No
Change the IC1001 or
the main PCB assembly.
5
No
Change the CN408 or
the main PCB assy.
No video
No
Check the video source and
check the connection of video cable?
Does the signal appear at R439?
Yes
Yes
Input a video signal.
Check the connected cable.
5
Yes
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 UN46C7000WF
Page 68: ...4 3 4 Troubleshooting ...
Page 79: ...4 14 4 Troubleshooting Location Main TOP BOTTOM A B Detail A CN401 B IC6001 ...
Page 80: ...4 15 4 Troubleshooting WAVEFORMS 1 2 PC Input V Sync H Sync 3 LVDS Out CLK ...
Page 82: ...4 17 4 Troubleshooting Location Main TOP BOTTOM A C B Detail A IC501 B CN2101 C IC1001 ...
Page 85: ...4 20 4 Troubleshooting Location Main TOP BOTTOM A C B Detail A TU701 B CN2101 C IC1001 ...
Page 86: ...4 21 4 Troubleshooting WAVEFORMS 5 Tuner CVBS Out Pattern Grey Bar 6 Eagle Out Clk H Sync ...
Page 88: ...4 23 4 Troubleshooting Location Main TOP BOTTOM A C B Detail A TU701 B CN2101 C IC1001 ...
Page 89: ...4 24 4 Troubleshooting WAVEFORMS 5 Tuner CVBS Out Pattern Grey Bar 7 TS DATA Out Clk Data 0 ...
Page 91: ...4 26 4 Troubleshooting Location Main TOP BOTTOM A C B Detail A CN408 R439 B CN2101 C IC1001 ...
Page 92: ...4 27 4 Troubleshooting WAVEFORMS 5 Tuner CVBS Out Pattern Grey Bar ...
Page 95: ...4 30 4 Troubleshooting WAVEFORMS 5 Tuner CVBS Out Pattern Grey Bar 9 Component Input Y Pb ...
Page 97: ...4 32 4 Troubleshooting Location Main TOP BOTTOM A B Detail A CN407 B CN302 CN2101 IC303 ...