Samsung UN HU7250F Series - No Video (HDMI 1;2;3;4_Digital Signal)

4-2-2. No Video (HDMI 1/2/3/4_Digital signal)
Symptom
Audio is normal but no picture is displayed on the screen.
Major
checkpoints
Check the HDMI source.•
Check the HDMI switch.•
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.
No Check a set in the ‘Stand-by mode’.
Yes
Check the HDMI source and check the
connection of HDMI cable.
No Input the HDMI signal properly.
Yes
1
Check the signal at Input of Main Board.
HDMI1 Clk -
Pin #10, #12 of CN700
DATA : Pin #7, #9, #4, #6, #1, #3 •
of CN700
HDMI2 Clk -
Pin #10, #12 of CN701
DATA : Pin #7, #9, #4, #6, #1, #3 •
of CN701
HDMI3 Clk -
Pin #10, #12 of CN801
DATA : Pin #7, #9, #4, #6, #1, #3 •
of CN801
HDMI4 Clk -
Pin #10, #12 of CN800
DATA : Pin #7, #9, #4, #6, #1, #3 •
of CN800
No
Check CN700, 701, 800, 801.
Check HDMI cable.
Change the Main Ass'y.
or
Check IC1400(NT14U).
Change the Main Ass'y.
Yes
2
Check the LVDS clk signal at output of
Main Board. (TX)
TX6_CLK : TCON SDA -
TX8_DATA : TCON SCL -
No
Check IC1400(NT14U).
Change the Main Ass’y.
Yes
Check the LVDS cable?
Replace the T CON / LCD panel?
Yes Please, Contact tech support.
Caution
Make sure to disconnect the power before working on the IP Board.
4-7
4. Troubleshooting