Samsung UD6400 Training Manual page 53

Trouble Shooting – No Video (Tuner CVBS)
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 #4 of Tuner : B3.3V_Tuner
Pin #2 of Tuner : B1.8V_Tuner
YES
Check the CVBS data out of IC901 ?
C941 : Tuner CVBS
YES
Check the LVDS clk signal at output of
Main board.(TX)
TX2_CLK : LV_TX2_DN/DP
TX4_CLK : LV_TX4_DN/DP
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 Ass'y.
NO
Check Tuner and IC801(Arsenal).
Change the Main Ass'y.
Check IC1001(GenoaS) and
NO
IC2001(Parma).
Change the Main Ass'y.
NO
Please, Contact Tech support.