Exception to the rule?

J

Jeff Strieble

Guest
I have a Zenith 19" "Sentry 2" TV, model SMS1917SG. New in 1995, it
still works well today, eight years later. The picture on cable is
excellent; good color, etc. No problems whatsoever with the set (CRT
or otherwise) so far. Do I have a set that just happens to have a good
CRT? I ask this after having read the posts to this group stating that
CRTs in Zenith televisions built from 1992 to the present have an
extremely high rate of failure. What is it about my set that sets it
apart from the rest of the troublesome Zeniths of this period--is mine
just a once in a blue moon fluke?

Jeff Strieble, WB8NHV (mailto: jeffhs@ameritech.net)
Fairport, Ohio
 
Most of the problems that I have seen have been in 25" and 27" CRTs, not in
19". Some of the guys that do more zenith could provide more specific info
I am sure, but I have seen lots of bad tubes in the 25" and 27" sets,
virtually none in the 19" size.

Just because you read of widespread problems with a particular set or brand
does not mean that every one will have the problem. Just like with sets
that are otherwise very reliable where there will be a few with catastrophic
failures. Be careful of over-generalizing information.

Leonard Caillouet

"Jeff Strieble" <jeffhs@ameritech.net> wrote in message
news:98360ebb.0312061052.7a22f2cb@posting.google.com...
I have a Zenith 19" "Sentry 2" TV, model SMS1917SG. New in 1995, it
still works well today, eight years later. The picture on cable is
excellent; good color, etc. No problems whatsoever with the set (CRT
or otherwise) so far. Do I have a set that just happens to have a good
CRT? I ask this after having read the posts to this group stating that
CRTs in Zenith televisions built from 1992 to the present have an
extremely high rate of failure. What is it about my set that sets it
apart from the rest of the troublesome Zeniths of this period--is mine
just a once in a blue moon fluke?

Jeff Strieble, WB8NHV (mailto: jeffhs@ameritech.net)
Fairport, Ohio
Click to expand...
 
The 19" Zenith tubes did not have the big problem. Mostly the 25" and 27"
from Glenwood Illinois manufacturing plant and the 32" from the same plant
during a certain production run.

David

Jeff Strieble <jeffhs@ameritech.net> wrote in message
news:98360ebb.0312061052.7a22f2cb@posting.google.com...
I have a Zenith 19" "Sentry 2" TV, model SMS1917SG. New in 1995, it
still works well today, eight years later. The picture on cable is
excellent; good color, etc. No problems whatsoever with the set (CRT
or otherwise) so far. Do I have a set that just happens to have a good
CRT? I ask this after having read the posts to this group stating that
CRTs in Zenith televisions built from 1992 to the present have an
extremely high rate of failure. What is it about my set that sets it
apart from the rest of the troublesome Zeniths of this period--is mine
just a once in a blue moon fluke?

Jeff Strieble, WB8NHV (mailto: jeffhs@ameritech.net)
Fairport, Ohio
Click to expand...
 
"Leonard Caillouet" <lcailloNOSPAM@devoynet.com> wrote in message
news:SHpAb.37568$_h.31545@lakeread02...
Most of the problems that I have seen have been in 25" and 27" CRTs, not
in
19". Some of the guys that do more zenith could provide more specific
info
I am sure, but I have seen lots of bad tubes in the 25" and 27" sets,
virtually none in the 19" size.

Just because you read of widespread problems with a particular set or
brand
does not mean that every one will have the problem. Just like with sets
that are otherwise very reliable where there will be a few with
catastrophic
failures. Be careful of over-generalizing information.

Leonard Caillouet
Click to expand...

That's been my experience too, Wells Gardner used a lot of Zenith tubes in
their 25" arcade monitors from around that time, most of them I've come
across have had weak tubes, just swapped one out with the tube from an old
NEC TV a couple weeks ago.
 
Lets not forget all the Sharp loss leader elcheapo 25" that came out in 97
that had the Zenith made crt's from the last bad batch Zenith had made.
Those for some reason did not short out, but simply became weak fairly
quickly. Could have been a slightly lower filament voltage and different
drive voltages in the Sharp to minimize the big shorting problems.

James Sweet <jamessweet@hotmail.com> wrote in message
news:3hqAb.318522$275.1072293@attbi_s53...
"Leonard Caillouet" <lcailloNOSPAM@devoynet.com> wrote in message
news:SHpAb.37568$_h.31545@lakeread02...
Most of the problems that I have seen have been in 25" and 27" CRTs, not
in
19". Some of the guys that do more zenith could provide more specific
info
I am sure, but I have seen lots of bad tubes in the 25" and 27" sets,
virtually none in the 19" size.

Just because you read of widespread problems with a particular set or
brand
does not mean that every one will have the problem. Just like with sets
that are otherwise very reliable where there will be a few with
catastrophic
failures. Be careful of over-generalizing information.

Leonard Caillouet


That's been my experience too, Wells Gardner used a lot of Zenith tubes in
their 25" arcade monitors from around that time, most of them I've come
across have had weak tubes, just swapped one out with the tube from an old
NEC TV a couple weeks ago.
Click to expand...
 
Leonard Caillouet:
I have seen plenty of the Zenith 19" sets with bad CRTs...... the local
hospital has tons and tons of these sets that I regularly service......
other than the CRT failures the Zenith has a great picture that is bright
and sharp with good coloremetry..... and fairly good reliability..... but,
of course, when the CRT dies.... the game is over. Be careful with the
diagnosis however, a fair amount of these that are too quickly diagnosed
with a bad CRT could actually have a failure in one of the NPN To92 video
driver transistors near the jungle chip..... I have seen plenty of those
too....... a fairly cheap and easy fix...... however if the driver
transistor(s) continue to fail it usually means that the CRT is shorted and
letting HV get back to the drivers and wipe them out.
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
------------------------------------


"Leonard Caillouet" <lcailloNOSPAM@devoynet.com> wrote in message
news:SHpAb.37568$_h.31545@lakeread02...
Most of the problems that I have seen have been in 25" and 27" CRTs, not
in
19". Some of the guys that do more zenith could provide more specific
info
I am sure, but I have seen lots of bad tubes in the 25" and 27" sets,
virtually none in the 19" size.

Just because you read of widespread problems with a particular set or
brand
does not mean that every one will have the problem. Just like with sets
that are otherwise very reliable where there will be a few with
catastrophic
failures. Be careful of over-generalizing information.

Leonard Caillouet

"Jeff Strieble" <jeffhs@ameritech.net> wrote in message
news:98360ebb.0312061052.7a22f2cb@posting.google.com...
I have a Zenith 19" "Sentry 2" TV, model SMS1917SG. New in 1995, it
still works well today, eight years later. The picture on cable is
excellent; good color, etc. No problems whatsoever with the set (CRT
or otherwise) so far. Do I have a set that just happens to have a good
CRT? I ask this after having read the posts to this group stating that
CRTs in Zenith televisions built from 1992 to the present have an
extremely high rate of failure. What is it about my set that sets it
apart from the rest of the troublesome Zeniths of this period--is mine
just a once in a blue moon fluke?

Jeff Strieble, WB8NHV (mailto: jeffhs@ameritech.net)
Fairport, Ohio
Click to expand...
 
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