No Video (Tuner_CVBS)
*Refer to the next page to check the lacation such a CN201 or IC201 SVC Manual mentioned.
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_Tuner
Pin #1 of Tuner : B1.8V_Tuner
No
Change the Main Ass’y.
Yes
2
Check the CVBS data out of IC1001 ?
C807 : Tuner CVBS
No
Check IC1001(X12).
Change the Main Ass’y.
Yes
3
Check the LVDS clk signal at output of
Main board.(TX)
TX2_CLK : ODD_TXCLK_DN/DP
TX4_CLK : EVEN_TXCLK_DN/DP
No
Check IC1001(X12).
Change the Main Ass’y.
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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