[TechAssist] Re: Zenith SS2504
- From: "Lynn B" <lynns@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 16 Jan 2002 10:30:04 -0600
Hi Gary: Keith is correct. In addition to replacing all the defective parts,
it is adviseable to isolate the filament from the chassis. You can make or
purchase a isolation transformer to do this. One cheap way is to rrmove
the two wire connector from the main chassis, remove the plug from the
wires. Then wrap the wires around the core of the fbt. Wrap the individual
wires in the opposite direction so you have two wraps then solder and
insulat
the ends together, and it should work. Also check for a cap on the crt
socket
from the foil of the point where the two wires from the main board are
connected
then remove the ceramic or whatever cap it is, and that will isolate the
filament
from the cathode, and chassis. This is helpful in keeping them out the door.
Lynns Electronics lynns@xxxxxxxxxxxx
----- Original Message -----
From: Keith Trumbla <ktrumbla@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, January 16, 2002 3:43 PM
Subject: [TechAssist] Re: Zenith SS2504
>
> Hi there Gary, We do a ton of these sets. 95 % of the time when the
> regulator is shorted on the sets, the culprit is a shorting CRT. Many
times
> we have fixed these to have them come back like revolving doors.
> Try tapping the neck of the crt when it is running.
> Good luck,
> Keith
>
>
> >From: "GARY AND JUANITA CHAMBERS" <gchambe3@xxxxxxxxxxxxxxx>
> >Reply-To: techassist@xxxxxxxxxxxxx
> >To: <techassist@xxxxxxxxxxxxx>
> >Subject: [TechAssist] Re: Zenith SS2504
> >Date: Tue, 15 Jan 2002 21:11:47 -0500
> >
> >
> >There are 2 smaller capacitors near the reg ic, i suspect they are bad,
> >also
> >I would change q3431 after that kind of overvoltage.
> >good luck,
> >gary CHAMBERS TV
> >BRADENTON,FL
> >SINCE 1982
> >----- Original Message -----
> >From: Don <tvgramps@xxxxxxxxxxx>
> >To: <techassist@xxxxxxxxxxxxx>
> >Sent: Tuesday, January 15, 2002 8:44 PM
> >Subject: [TechAssist] Zenith SS2504
> >
> >
> > >
> > > Came in with fuse main fuse blown 2 B+ diodes shorted and C3431 had
> > > vented,changed these parts and installed new STR54041 set fired up
with
> > > video and audio ok. After about 1 minute lost video then shutdown. The
> > > regulator heat sink was too hot to touch, left unplugged for about
five
> > > minutes and plugged back in, the regulator heat sink started to get
hot
> > > again before the set was ever turned on. I checked the transistor near
> >the
> > > regulator Q3431 it checked ok. No schematic nothing listed in Sam's
for
> >this
> > > model.
> > >
> > >
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