In observation of how you are asking the questions, I think that if this is
a good TV, and is worth something to you, you should send it out to a
service centre and have it properly repaired. It may be a cold solder
connection, or a failing component. This is not something to be guessed at
or speculated about.

--

Jerry G.
==========================


"Charlie Bress" wrote in message
...
With no board layout or schematic how can I id which device it is?
Is it on a heat sink? Typical pn's? I have the soldering iron, I have the
solder and the ability. What I need is a way of telling which device it is.

Charlie

"Lance Dyer" wrote in message
...
start with resoldering the vertical output IC It is common for these
connections to crack and give that problem


"Charlie Bress" wrote in message
...
The model is a 27G22V, the chassis is APEDP280.
This set has had an intermittent vertical collapse/instability problem
for
some time.
This only shows up cold. After 5 minutes it is stable and stays that way
until it is cold again.
It has been pretty consistent in always showing the problem.
A slight bump on the case will generally eliminate the problem for the
session.

I finally got a neighbor to help pull it out of the entertainment
center.

I have been looking for a bad solder joint or other bit of flakiness.
Nothing shows up visually. I have inspected most of the solder side with
a
magnifier. I have jiggled the leads going to the yoke. I have used an
old
aligning tool to push, poke, prod and otherwise try to replicate the
problem.
Of course, everything works without a hitch

Since I have not had the need to get into the innards of a set since the
days of hybrids, I don't recognize circuits by their layout and
component
mix. What is being used for the vertical amp/output device? I don't
have
a
cold spray and the heat gun seems like it is going the wrong way

Suggestions are solicited on what might be next. I hate to just button
it
up
and put it back without resolution.

Charlie

The first TV I ever worked on was a 7" Dumont that had a brute force HV
supply and electrostatic deflection.
.