Old Tv Help

Got a 27" panasonic tv.  Its Tube but has a flat viewing surface.
Today when I turn it on it worked fine.  Then later tonight I turned it on
and it had a 360 rainbow effect.  Is it toast?
I Haven’t change anything around the Tv, so I know its not a speaker magnet.

lol mine did that when i moved it i then hit a few times with a rench turned it off and on and it worked fine…

Just needs to be degaussed.  Turn it off and on a few times to see if that fixes it.