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. -
Major
checkpoints
Check the Tuner CVBS source. -
Check the Tuner, Check the Valencia. -
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 ?
Check the LVDS cable?
Replace the T-con / LCD panel?
Yes
Yes
Yes
Yes
Yes
No
No
Check a set in the ‘Stand-by mode’.
Please, Contact Tech support.
Input the RF source properly.
Check the RF source and
check the connection of RF cable ?
No
Change the Main Assy.
Check Tuner and IC901(Arsenal).
Change the Main Assy.
Check IC1101(Valencia) and
IC1701(Reading).
Change the Main Assy.
No
No
No
Check the Power of Tuner ?
Pin #5 of Tuner : B33V_Tuner
Pin #3 of Tuner : B5V_Tuner
Check the CVBS data out of IC901 ?
L901 : CVBS data
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
7
5
Caution Make sure to disconnect the power before working on the IP board.
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