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 Tuner.•
This may happen when the LVDS cable connecting the Main Board and the Panel is •
disconnected.
Diagnostics
Power indicator LED is off.
Lamp(Backlight) on, no video ?
No
Check a set in the ‘Stand-by mode’.
Yes
Check the RF source and check the
connection of RF cable.
No
Input the RF source properly.
Yes
1
Check the Power of Tuner ?
Pin #4 of Tuner : B3.3V
Pin #2 of Tuner : B1.8V
No
Change the Main Assy.
Yes
2
Check the CVBS data out of #10 Pin of
Tuner ?
Check the DTV data out of #8,9 Pin of
Tuner?
No
Change the Main Assy.
Yes
2
Check the LVDS clk signal at output of
Main board ?
ODD_TXCLK- / ODD_TXCLK+
EVEN_TXCLK- / EVEN_TXCLK+
No
Change the Main Assy.
Yes
Check the LVDS cable?
Replace the T-con / LCD panel?
No
Please, Contact tech support.
Caution Make sure to disconnect the power before working on the IP board.
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