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4. Troubleshooting
4-2-4. 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.
-
Check the Tuner CVBS source.
-
Major
Check the Tuner, Check the Valencia.
-
checkpoints
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
7
Diagnostics
5
Caution
Make sure to disconnect the power before working on the IP board.
4-16
Power indicator LED is off.
Lamp(Backlight) on, no video ?
Yes
Check the RF source and
check the connection of RF cable ?
Yes
Check the Power of Tuner ?
Pin #5 of Tuner : B33V_Tuner
Pin #3 of Tuner : B5V_Tuner
Yes
Check the CVBS data out of IC901 ?
L901 : CVBS data
Yes
Check the LVDS clk signal
at output of Main board.(TX1~TX4)
TX1_CLK : TP1978 ~1979
TX2_CLK : TP1980 ~1981
TX3_CLK : TP19102 ~19103
TX4_CLK : TP19104 ~19105
Yes
Check the LVDS cable?
Replace the T-con / LCD panel?
No
Check a set in the 'Stand-by mode'.
No
Input the RF source properly.
No
Change the Main Assy.
No
Check Tuner and IC901(Arsenal).
Change the Main Assy.
Check IC1101(Valencia) and
No
IC1701(Reading).
Change the Main Assy.
No
Please, Contact Tech support.

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