4-16
4. Troubleshooting
4-1-5. No Video (Tuner DTV)
Symptom
Audio is normal but no picture is displayed on the screen.
-
Major
checkpoints
Check the DTV source
Check the Chelsea
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
-
-
Caution
Make sure to disconnect the power before working on the PD board.
Diagnostics
No
Check TU5001
Change the main PCB assembly.
No video
No
Check the RF source and
check the connection of RF cable?
Yes
Does the digital data appear
at pin15, 16 of TU5001?
Yes
Input the RF signal.
Check the connected cable.
Yes
7
Yes
Check the LVDS cable?
Replace the LCD panel?
Please, contact Tech support
No
Does the digital data appear at
pin14~42 of CN7005?
No
Check IC7001
Change the main PCB assembly.
5
Summary of Contents for UA40B7000WM
Page 7: ...1 4 1 Precautions Memo...
Page 37: ...4 3 4 Troubleshooting...
Page 43: ...4 9 4 Troubleshooting PIN27 A5V PIN23 B12VS PIN15 B5V PIN9 B13V...
Page 45: ...4 11 4 Troubleshooting WAVEFORMS 1 2 PC Input V Sync H Sync 3 LVDS Out CLK...
Page 49: ...4 15 4 Troubleshooting WAVEFORMS 5 Tuner CVBS Out Pattern Grey Bar 6 Eagle Out Clk H Sync...
Page 51: ...4 17 4 Troubleshooting WAVEFORMS 5 Tuner CVBS Out Pattern Grey Bar 7 TS DATA Out Clk Data 0...
Page 53: ...4 19 4 Troubleshooting WAVEFORMS 5 Tuner CVBS Out Pattern Grey Bar...
Page 55: ...4 21 4 Troubleshooting WAVEFORMS 5 Tuner CVBS Out Pattern Grey Bar 9 Component Input Y Pb...
