Samsung UD6400 Training Manual page 49

Trouble Shooting – No Video (analog PC)
Power indicator LED is off.
Lamp(Backlight) on, no video ?
YES
Check the PC source and
check the connection of D-SUB ?
YES
Check the signal appear at input of IC901 ?
PC_RED : BD401
PC_GREEN : BD402
PC_BLUE : BD403
PC_H_SYNK : R408
PC_V_SYNK : R409
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'
or 'DPMS mode'.
NO
Input the analog PC signal properly.
NO
Check CN401, PC cable.
Change the Main Ass'y.
Check IC1001(GenoaS) and
NO
IC2001(Parma).
Change the Main Ass'y.
NO
Please, Contact Tech support.