[TechAssist] Re: Zenith SS8769H2, 9-840-1, 9-822-1 no power, FIXED

  • From: Kevin <kevinstv@xxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Wed, 20 Nov 2002 23:38:36 -0800

Yes, the larger the value of the cap the lower the ESR that is allowed.
For example a 1uF can be 70 or higher and still be OK.  But a 100uF with
an ESR of 3 or higher is bad.  Usually when I check these 100uF caps
with high ESR the value is 70uF or less.  Even if they read OK value
wise, I can make them fail by using cold spray.  JFYI

Kevin Wilks
Kevin's TV & Video Repair
Penticton BC Canada
kevinstv@xxxxxxx 


-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Leonard G.
Caillouet
Sent: Wednesday, November 20, 2002 2:52 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: Zenith SS8769H2, 9-840-1, 9-822-1 no power,
FIXED


Thanks Bob, you were right on.  I found one cap C3407 100uF 25V in the
primary of the power supply that had slightly high ESR (6 ohm) and
marginal
DA (11%).  I resoldered a number of connections, though none really
looked
bad and now it works.

I would not have thought that the ESR reading was all that bad but
checking
the Sencore chart it is too high for this value cap.

Leonard G. Caillouet
Service Manager
Electronics World
Gainesville, FL
352-332-5608
352-332-5668 (fax)

----- Original Message -----
From: "Bob@Bobs tv" <woodman1@xxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, November 20, 2002 3:45 PM
Subject: [TechAssist] Re: Zenith SS8769H2, 9-840-1, 9-822-1 no power


>
> Len,
>      Remove sweep module 9-822 and check for loose connections and ESR
caps
> in the power supply. You may also want to do search as this is a C3
chassis.
> Hope this helps
> Bob,
>
> Bobs TV   Worcester, ma
>
> woodman1@xxxxxxxx
>
> Main  508-853-1482
> Fax    508-853-1480
> ----- Original Message -----
> From: "Leonard G. Caillouet" <lcaillo@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Wednesday, November 20, 2002 3:14 PM
> Subject: [TechAssist] Zenith SS8769H2, 9-840-1, 9-822-1 no power
>
>
> >
> > Any of you zenith experts have some tips on this one?  I have no
manual
> (NLA
> > from Zenith) and no experience with this set.  The set will not
power
up.
> > Relay clicks twice.  Power supply has output on secondary, 135v at
HOT
> > collector.  FBT tests good, nothing happens at HOT except slight
drop in
> dc
> > at collector when it tries to turn on.  No drive signal at all
appears.
> > Micro is powered and it does respond to power button.
> >
> > power/deflection module is 9-840-1
> > control/video module is 9-822-1
> >
> > I am guessing that the VCJ is IC2301 (221-518).  can anyone tell me
> anything
> > about it?  Where is it supplied from, H drive at what pin, etc?  It
> appears
> > to not be powered...
> >
> > None of the Zenith manuals that I have contain anything like these
> modules.
> > Any help would be appreciated.
> >
> > Leonard G. Caillouet
> > Service Manager
> > Electronics World
> > Gainesville, FL
> > 352-332-5608
> > 352-332-5668 (fax)
> >
> >
> >
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