Convergence Problems

[CP]

I have a Toshiba 50-inch rear-projection TV that's about 5 years old.
It tends to get wavy after 20 minutes or so of viewing, with the three
color lines going wacky and the screen shifting up. If I (ahem) knock
the back of the TV, it will be fixed---sometimes. But it's only
gotten worse over the past three months, and even a solid whack
doesn't fix the problem. Any ideas?

 

[David]

A connection problem somewhere in the tv set. Without actually seeing it in
action, no way to even narrow down where to start looking.

Odds are very high that if you keep running it like this, you will probably
have an more expensive failure to have repaired.

David

CP <googlegroups@christopherporter.com> wrote in message
news:c79e0c05.0310131712.362a223a@posting.google.com...

I have a Toshiba 50-inch rear-projection TV that's about 5 years old.
It tends to get wavy after 20 minutes or so of viewing, with the three
color lines going wacky and the screen shifting up. If I (ahem) knock
the back of the TV, it will be fixed---sometimes. But it's only
gotten worse over the past three months, and even a solid whack
doesn't fix the problem. Any ideas?

 

[James Sweet]

It's got a cracked solder joint somewhere, stop using it immediatly until
you get it looked at, a bad connection can blow up all sorts of expensive
parts, and in this case it's something in the deflection circuitry, and if
that fails it can destroy all three picture tubes in less than a second,
which generally turns the set into scrap.


"CP" <googlegroups@christopherporter.com> wrote in message
news:c79e0c05.0310131712.362a223a@posting.google.com...

I have a Toshiba 50-inch rear-projection TV that's about 5 years old.
It tends to get wavy after 20 minutes or so of viewing, with the three
color lines going wacky and the screen shifting up. If I (ahem) knock
the back of the TV, it will be fixed---sometimes. But it's only
gotten worse over the past three months, and even a solid whack
doesn't fix the problem. Any ideas?

 

[Leonard Caillouet]

I am curious how a bad solder connection in a convergence circuit will blow
up "all sorts of expensive parts". No doubt you could end up with a bad
output IC and a blown fuse and resistor or several. Might have a bad output
IC anyway right now. I have, however, never run into extensive damage of
the sort that you describe that started with a convergence problem. Now if
there is any hint of deflection failure, certainly burned crts are a
potential problem, but lets not exaggerate the potential in erroneus ways.

Getting the set fixed by an experienced tech sooner rather than later is
good advice. Let's just keep the advice credible.

Leonard Caillouet

"James Sweet" <jamessweet@hotmail.com> wrote in message
news:YhOib.560362$cF.237159@rwcrnsc53...

It's got a cracked solder joint somewhere, stop using it immediatly until
you get it looked at, a bad connection can blow up all sorts of expensive
parts, and in this case it's something in the deflection circuitry, and if
that fails it can destroy all three picture tubes in less than a second,
which generally turns the set into scrap.


"CP" <googlegroups@christopherporter.com> wrote in message
news:c79e0c05.0310131712.362a223a@posting.google.com...
I have a Toshiba 50-inch rear-projection TV that's about 5 years old.
It tends to get wavy after 20 minutes or so of viewing, with the three
color lines going wacky and the screen shifting up. If I (ahem) knock
the back of the TV, it will be fixed---sometimes. But it's only
gotten worse over the past three months, and even a solid whack
doesn't fix the problem. Any ideas?