4-7
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 IC6001(SDP84)
-
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
Diagnostics
No
Check a B+ voltage (#3 of Tuner) 5V,
change a main PCB ass’y.
No
No
Power Indicator is off.
Lamp on, no picure.
Yes
Check a Tuner(TU5001)
Change a main PCB ass’y.
Does the signal appear at R5035?
[4] Does the signal appear at
pin 9 of TU5001?
Does the digital data appear at the
output of LVDS (TP7025~TP7038 ,
TP7040~TP7053)?
No
Please, Contact Tech support.
Check the LVDS cable?
Replace the LCD panel?
Yes
Connect the RF cable and
check RF signal.
Yes
1
2
3
Yes
No
Check a IC7001
Change a main PCB ass’y
Caution
Make sure to disconnect the power before working on the IP board.
Содержание LA37C630 Series
Страница 38: ...1 4 1 Precautions Memo ...
Страница 61: ...4 4 4 Troubleshooting WAVEFORMS 1 R G B H_sync input signal of IC6001 SDP84 ...
Страница 63: ...4 6 4 Troubleshooting WAVEFORMS 2 Digital Output Data 3 Signal of HDMI Data ...
Страница 65: ...4 8 4 Troubleshooting WAVEFORMS 3 CVBS Output Signal 4 Tuner_CVBS Output Signal ...
Страница 67: ...4 10 4 Troubleshooting WAVEFORMS 4 CVBS Output Signal at C6852 C6853 C6854 ...
Страница 69: ...4 12 4 Troubleshooting WAVEFORMS 6 The Signal are Inputed to IC2002 7 The Signal are Inputed to IC2002 ...