No Video (Component) - Samsung UN55HU7200F Service Manual

4-2-6. No Video (Component)

Symptom Audio is normal but no picture is displayed on the screen.
• Check the Component source.
Major
• This may happen when the LVDS cable connecting the Main Board and the Panel is
checkpoints
disconnected.
1
Diagnostics 2
3
Caution Make sure to disconnect the power before working on the IP Board.
Power indicator LED is off.
Lamp(Backlight) on, no video.
Yes
Check the component source and
check the connection of component cables
(Y, Pb, Pr).
Yes
Does the component data appear at.
COMP2_Y_CVBS : R505
-
Pb : R504
-
Pr : R502
-
Yes
Check the LVDS clk signal at output of
Main Board. (TX)
TX6_CLK : TCON SDA
-
TX8_DATA : TCON SCL
-
Yes
Check the LVDS cable?
Replace the T CON / LCD panel?
No Check a set in the 'Stand-by mode'.
No Input the component source properly.
Check CN502.
No
Change the Main Ass'y.
Check IC1400(NT14U).
No
Change the Main Ass'y.
Yes Please, Contact tech support.
4. Troubleshooting
4-19