Samsung UN40HU6950F, Service Manual, Page: 41 / 81

4-2-6. No Video (COMPONENT)
Note
Refer to the next page to check the location such a CN201 or IC201 SVC Manual mentioned.
Symptom Audio is normal but no picture is displayed on the screen. •
Major
checkpoints
Check the Component source •
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 component source and check
the connection of component cables ?
Y, Pb, Pr
No
Input the component source properly.
Yes
1
Does the component data appear at ?
COMP2_Y_CVBS : R505
-
Pb : R504
-
Pr : R502
-
No
Check CN502.
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?
No Please, Contact tech support.
Caution Make sure to disconnect the power before working on the IP Board.
4-19
4. Troubleshooting