Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!ukc!strath-cs!al
From: al@cs.strath.ac.uk (Alan Lorimer)
Newsgroups: sci.electronics
Subject: Re: TV Picture Tube Replacement
Message-ID: <4628@baird.cs.strath.ac.uk>
Date: 3 Sep 90 16:00:48 GMT
References: <59221@bbn.BBN.COM> <34590007@hprmokg.HP.COM>
Reply-To: al@cs.strath.ac.uk
Organization: Comp. Sci. Dept., Strathclyde Univ., Scotland.
Lines: 39

In article <34590007@hprmokg.HP.COM> barry@hprmokg.HP.COM (Barry Fowler) writes:
>You can probably do it at home if you are familiar with the alignment
>procedures.  I have done it.
>
>I question the cost effectiveness of doing so, however.  Replacement
>CRTs are very expensive as TVs are starting to evolve into "consumable


Brand new CRTs are indeed expensive, however regunned tubes which
these days are safe and cheap have a comparatively trivial cost.

I have replaced a number of tubes 22" Philips G11 A56-550X etc and
some 14" ones. Each tube has cost about #40 sterling to buy and has
taken about 1.5 hours to fit (including line up). 

The problem which the original poster mentioned was a trinitron tube
which I promise him will be a nightmare to fit! Fine tuning of
convergence and purity on these sets is achieved by GLUEING magnets
onto the outside of the bowl. It is not the action of glueing the
magnets which is difficult, but the fact that positioning them
requires the set to be running and access to most parts of the tube
bowl. 

On sony sets, this is notoriously difficult - Sony how do you do it in
the factory. Sony sets to do not take kindly to the idea of running
while in a semi dismantled state, the boards rarely hinge out and
access to the bottom part of the tube is usually immediately adjacent
to the line output transformer/transistor with 27kV ready to arc
accross to the unwary engineer's hand!

If your local TV repair shop charges a premium for mending Sony sets -
pay it willingly - at least they're going to *try* to fix it.

Alan
-- 
____________________________________________________________________________
Alan G. Lorimer, Strathclyde University, 26 Richmond Street, Glasgow G1 1XH.
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