Satellite C50-A-19 t - very low display

Hi I have a Toshiba Satellite C50-A-19 t Windows 8 and recently the display is almost non-existent.
When I start the machine, I see about the Toshiba Logo and that's it – even, it is difficult to see.

What I tried:
(1) external Monitor - external monitor works fine (connected via VGA).
(2) I have tried the Fn/F4 key to chang what display, tried a few settings and still nothing on the laptop screen
(3) I have obviously checked the brightness, it's almost max.
(4) I removed the battery and power, left computer laptop for a while, then tried to turn on the back with the battery still out - nothing else.
(5) I googled like crazy and tried to remove the battery & power, press and hold the power button / stop for 60 + seconds, made 5 - 10 times in all, still nothing when I power on
(6) I replaced the screen with another similar toshiba that I know works - it's exactly the same thing.

Is there anything else that I'm missing here?

The laptop works like a dream when connected to an external monitor... and I have removed and reloaded all drivers display, reset the CMOS, etc..

I am confused now and it is one of the children with homework, so my ears get sore!

PLS HELP!

> 1) external Monitor - external monitor works fine (connected via VGA)

It is most important information that you have provided in your message.
In case the external monitor is OK, the GPU/motherboard should also be OK.

From my point of few display panel (backlight) is defective.
The backlight of the display is not working properly.

You said that you have replaced the screen well, compatible display board?

Tags: Toshiba

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