Satellite C50D-A-138 backlight not working

Hi, I am having a major issue with my laptop. The backlight for the display will not work. I can only faintly see the picture. I tried adjusting brighness, no joy. It outputs fine to a monitor. I have tried replacing the screen and the connecting ribbon but the issue still presents itself. Does anyone have any ideas??? I am at a loss.
Paul

Hi
Connect external monitor and check if the same display problem would appear on the external display.
In case everything would appear properly on the external display, the problem must be the internal display panel.
The notebook’s display panel seems to use a LED backlight as the light source.
So probably the display’s backlight doesn’t function correctly. In such case the display panel must be replaced.
You should ensure that you are using compatible panel because many notebook displays support different technology (TFT panels without backlight and display supporting backlight like the one build in the C50D-A)

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