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4-14
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 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 IP board.
Diagnostics
Check TU5001
Change 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 pin8 of
TU5001?
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
Содержание UA40B7000WM
Страница 7: ...1 4 1 Precautions Memo...
Страница 37: ...4 3 4 Troubleshooting...
Страница 43: ...4 9 4 Troubleshooting PIN27 A5V PIN23 B12VS PIN15 B5V PIN9 B13V...
Страница 45: ...4 11 4 Troubleshooting WAVEFORMS 1 2 PC Input V Sync H Sync 3 LVDS Out CLK...
Страница 47: ...4 13 4 Troubleshooting WAVEFORMS 4 5 HDMI Input CLK 6 Tuner CVBS Out Pattern Grey Bar 7 TS DATA Out Clk Data 0...
Страница 49: ...4 15 4 Troubleshooting WAVEFORMS 5 Tuner CVBS Out Pattern Grey Bar 6 Eagle Out Clk H Sync...
Страница 51: ...4 17 4 Troubleshooting WAVEFORMS 5 Tuner CVBS Out Pattern Grey Bar 7 TS DATA Out Clk Data 0...
Страница 53: ...4 19 4 Troubleshooting WAVEFORMS 5 Tuner CVBS Out Pattern Grey Bar...
Страница 55: ...4 21 4 Troubleshooting WAVEFORMS 5 Tuner CVBS Out Pattern Grey Bar 9 Component Input Y Pb...
Страница 57: ...4 23 4 Troubleshooting WAVEFORMS 0 Audio Input Sign Wave I2S Input Clk Data Audio Amp Out Sign Wave...