Samsung UD6400 Training Manual page 51

Trouble Shooting – No Video (HDMI)
Power indicator LED is off.
Lamp(Backlight) on, no video ?
YES
Check the HDMI source and
check the connection of HDMI cable ?
YES
Check the signal at Input of Main board ?
HDMI1 Clk : Pin #31,#32 of IC601
DATA : Pin #33~#38 of IC601
HDMI2 Clk : Pin #21,#22 of IC601
DATA : Pin #23~#28 of IC601
HDMI3 Clk : Pin #11,#12 of IC601
DATA : Pin #13~#18 of IC601
HDMI4 Clk : Pin #2,#3 of IC601
DATA : Pin #4~#9 of IC601
YES
Check the signal at Output of 'HDMI switch
IC' ?
HDMI RX_Clk : Pin#116~117 of IC601
RX_Data : Pin#110~115 of IC601
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 HDMI signal properly.
Check CN601~4.
NO
Check HDMI cable.
Change the Main Ass'y
NO
Check IC601(HDMI switch).
Change the Main Ass'y
Check IC1001(GenoaS) and
NO
IC2001(Parma).
Change the Main Ass'y.
NO
Please, Contact Tech support.