Sim can't watch wall mounted TV

@1smalllamp  In the picture with the fireplace, it may be an object on the mantle causing it.  Did you try to watch TV without the objects sitting on the mantle?  My first though when I looked at the picture was the bust statue may be interfering.

Another thing it could be is if you placed an object with MOO on.  So if you did, that may be it.

In the picture without the fireplace, I see stairs behind the wall that the TV is on.  And just by the way they work, they protrude into walls.  I have had instances where things protruding in the wall block things on the other side of the wall although it's usually been something else, not stairs, but it's probably worth looking at anyway.  I has one case where a Barfy doll I had placed at an angle protruded into the wall and blocked the stairs on the other side.  So did you try deleting the stairs and see if you can watch TV?

Finally, since the walls are down, is there anything else mounted on the wall?  Remote possibility at best but you never know.  You might want to look at the other side of the wall too to see if anything on that side could be causing the problem.