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 M-star
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
-
-
Diagnostics
No
Check a B+ voltage (#2 of Tuner) 5V,
change a main PCB ass’y.
No
No
Power Indicator is off.
Lamp on, no picure.
Yes
Change a main PCB ass’y.
Does the signal appeat #8 of TU4001?
Does the Signal appear at c6025
of IC6003?
Check the LVDS cable?
Replace the LCD panel?
Please, Call to Samsung Co. LTD.
Yes
Connect the RF cable and
check RF signal.
Yes
Yes
Caution
Make sure to disconnect the power before working on the IP board.
Summary of Contents for LA26B350F1
Page 29: ...1 4 1 Precautions Memo...
Page 39: ...4 4 4 Troubleshooting WAVEFORMS 1 R G B Output Signal...
Page 41: ...4 6 4 Troubleshooting WAVEFORMS 2 Digital Output Data 3 Signal of HDMI Data...
Page 43: ...4 8 4 Troubleshooting WAVEFORMS 3 CVBS Output Signal 4 Tuner_CVBS Output Signal...
Page 45: ...4 10 4 Troubleshooting WAVEFORMS 4 CVBS Output Signal...
