Acer Aspire E5-551 Screen goes black

Hi laptop trouble.

Aspire E5-551 starts up ok but screen goes black. Touch the keyboard or tracker pad and screen comes on for a second or so then goes back off again. I have it plugged into the mains as I am not sure what the battery is like. Any ideas would be gratefully received.

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The screen on this model is easy to replace:

Example video:

https://www.youtube.com/watch?v=a7QicAvh...

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