4-2-6. No Video (Component)
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
2
Does the component data appear at.
COMP2_Y_CVBS : R505
-
Pb : R504
-
Pr : R502
-
No
Check CN502.
Change the Main Ass’y.
Yes
3
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.
4-19
4. Troubleshooting
Summary of Contents for UN HU7250F Series
Page 19: ...2 6 2 Product specifications Item UN HU7250FXZA Accessory Slim Gender Cable N A ...
Page 36: ...Waveforms 1 HDMI input RX_Data RX_Clk 2 LVDS output 4 9 4 Troubleshooting ...
Page 39: ...Waveforms 1 CVBS OUT Grey Bar 3 LVDS output 4 12 4 Troubleshooting ...
Page 42: ...Waveforms 2 CH_CLK CH_VALID 2 CH_CLK CH_VALID 3 LVDS output 4 15 4 Troubleshooting ...
Page 45: ...Waveforms 1 CVBS OUT Grey Bar 3 LVDS output 4 18 4 Troubleshooting ...
Page 69: ...Factory Menu Name Data Range B10_Gain Advanced 4 42 4 Troubleshooting ...