[TechAssist] Re: Zenith SL2784BT 9-1235/9-1268 DEAD
- From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 24 Dec 2002 21:18:28 +0000
This sweep board (9-1268-02) is a rebuilt board so it is not the first time
this happpened. I tested the CRT with another zenith chassis (a 1400 series)
it runs ok. I tried a larger fuse 3A for the old smoke test.. There is a
massive amount of curent being drawn across the horzontial driver transistor
and the drive transformer they start to smoke without shorting???. The HOT
remains cold so it is probbably chassis time. The customer did not want to
spend the money for a new/refurb chassis. so they may call for it or I may
get stuck with it It's a nice set pip, SVHS, 2 video inputs, outputs ...27"
so I may end up fixing it anyway. Its weird people have been giving me a
number of 27" + sets lately, good brands like Sony, MAgnovox, Panasonic..
Peter Oliver
Tucson Radio TV
From: "Bob@Bobs tv" <woodman1@xxxxxxxx>
Reply-To: techassist@xxxxxxxxxxxxx
To: <techassist@xxxxxxxxxxxxx>
Subject: [TechAssist] Re: Zenith SL2784BT 9-1235/9-1268 DEAD
Date: Tue, 24 Dec 2002 10:58:06 -0500
Hi Pete,
With fuse blown check HOT collector, if B+ there, power supply
probably ok. There have been problems with the audio panel soldered to the
main board. There is a small two wire cable from the SMPS that plugs in near
the metal box audio panel, unplug it. With jumpers hookup another fuse and
try set. Another point don't get to involved as these are the sets with the
bad A68AGD picture tubes.
Bob,
Bobs TV Worcester, ma
woodman1@xxxxxxxx
Main 508-853-1482
Fax 508-853-1480
----- Original Message -----
From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, December 24, 2002 12:40 AM
Subject: [TechAssist] Zenith SL2784BT 9-1235/9-1268 DEAD
>
> Zenith
> model SL2784BT
> Split flat chassis 9-1235 main 9-1268 sweep/smps
> Customer complaint lost picture had sound then dead.
> Took apart and checked found H.O.T blown and secondary b+ fuse blown
>
> So Checked for bad connections, sested some surrounding electrolitics and
> replaced parts turn on pops fuse. HOT ok
> MAybe it's too close to chistmas and too long of a day but this one is a
> little strange
>
> Replaced Q3208 1148-01 sub'd 2sd1880
> FX3408 2A 250V pigtail
>
> There aren't any obvious shorts or any 'smoking guns' to speak of.
> I guess I could replace the board if it's avalible, I haven't checKed yet
> Its been a busy day everbody wants stuff before christmas.
>
>
>
>
> Peter Oliver
> Tucson Radio TV
>
>
>
>
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