Windows RT 8.1 refurbished; brightness issue

[Agave Azul]

( I may have posted this in the incorrect forum-please move if needed )

Hey all.
Got my friend this refurbished RT with 8.1.
Runs great.
However, he is now experiencing some brightness issues.

What his is doing is that the screen seems to fluctuate brightness.
Sometimes with the charge cord connected.
Sometimes not connected.
Sometimes it happens with both.

Could the battery be an issue?

Or what other suggestions do you all have for it?

 

[GreyFox7]

Try disabling the Auto brightness.

Change PC Settings - PC and devices - Power and sleep - set adjust my screen brightness automatically to OFF.

 

[Agave Azul]

Thanx!
I let him know what to do with your suggestions.
I'll let you know how it responds...