I posted earlier that this tv given by my parents to me has always cut
out and made a loud screetching on channels 2 and 4 over the air
channels. They are the weakest channels I cna get in my areas. I can
temporarily fix this by wiggeling the coax on back of the set.
SOmetimes flipping the channels temporarily fixes it.

What is the problem and how can I diagnose it? It is something in the
coax jack?

I have read about the tuner problem but it seems it is not typically on
my model but I dont know for sure. The rest of my pictures channels and
satelite and vcr are fine and never do this?

If it is a tuner problem, can I just buy a new tuner to put in? Is this
difficult to replace? I am very mechanically inclined, dont know if
this would help in this case though. This is my main living room tv for
my family.