I need help with photoshop!

It's going to be pretty hard to remove that because of the different lighting and how slanted the wall is. What is it that you want to do with it, do you just want a plain wall or do you want to put something else there?
 
simple, the TV is a quadrilateral with (hopefully) straight sides so simply get the Polygon lasso Tool and touch the corners and boom it should be selected. Now dependent on what you want cut it out and place it in a new layer either making it fully transparent or only slightly whatever is your choice. It being on a new layer helps so in case you want to do something with it it will only affect it and not the rest of the image.
 
I'm sure if you play with it enough you ought to figure it out. ☺ The magic wand can grab most of the canvas you want to alter, the lasso can be used to perform clean up of remainder shade pixels quite easily I think.

mini.jpg

blank-tv.jpg
 
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