[TechAssist] Re: STK 392-110 testing
- From: "Leonard Caillouet" <lcaillo@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 26 Jul 2005 22:56:11 -0400
I have been replacing output ICs for many years and have never believed this
to be true. There are cases where it makes sense to change both. If I can
identify the bad one and there is no other reason to change the second, I
don't unless the client chooses to do so. In the Sony sets, some can be
impractical to troubleshoot to a single chip. Others, like the ones with
the two 4278s on the same heat sink, require both because removing one
without removing the other is not possible and damage to the pins inside the
chip is likely when getting them off of the heat sink.
I have never found the second chip to fail anytime soon after replacing the
first in the sets where we replace only the defective.
Leonard Caillouet
Service Manager
Electronics World
Gainesville, FL
----- Original Message -----
From: "Kevin's TV Repair" <kevintv@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, July 26, 2005 4:01 PM
Subject: [TechAssist] Re: STK 392-110 testing
I believe that if one STK fails that the other one is not far behind.
Another shop told me that Sony always says to replace both. Their
experience (years ago when the STK's were $90 each) of replacing just
one to save money ended up having the second STK fail after just a few
months.
My question is, what percentage of the time have you replaced the STK's
and found it was something else causing the convergence problems?
Thanks.
Kevin Wilks
Kevin's TV Repair
Penticton BC Canada
kevintv@xxxxxxx
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Larry
Sent: Tuesday, July 26, 2005 9:39 AM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] STK 392-110 testing
over a few months i have replaced many stk392-110 sin pares,
but probably only one was bad.
also replaced and found it was no help to the convergence
problems.
i am sure 75% of these are good. is there any way to check them.
the ones i know are bad i have scrapped, but now i have a box
of used and probably good ones also.
i have tried resistance readings compared to a new one and
they are identical.
but i dont trust them, even though some new ones seem to last
shorter than the old ones.
It bothers me to just always replace the stks every time i
have convergence problems and then end up finding something
else later.
How can they be tested???
Larry
--
Schneider TV & Electronic Inc.
5415 N. Wooster ave.
Dover, Ohio 44622 www.geocities.com/schntv2000/
330-343-0768 FCC. first class & Extra class K8WLY
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