[TechAssist] Re: Daewoo model DTQ26s1fc color tv

  • From: "Bill S" <billans@xxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Tue, 14 May 2002 20:04:23 -0700


Al;
Your original post said flyback and then the response to Gary says yoke?
Can we assume that your ringing the flyback out of circuit and its ringing
good??   If so then when your flyback is ringing okay out of the circuit and
then in circuit rings crappy, there are several things you want to start
thinking about.
First thing you want to do is to start removing all the paths out of the
flyback.  If you start taking unsoldering all the pins from the flyback and
make sure that nothing is connected and then leave the ringer on the primary
side of  fly and then start attaching the pins to the circuit board again
and when the ringer indicates a bad condition again, then track that circuit
down.  It is not at all unusual for many of the secondaries off of the fly
to be so marginally ineffective that any kind of a load will cause the HOT
to die because the new sets with the new flybacks are just not set up for
any kind of a shorted heavy load.
I also have had flybacks that checked good out of circuit but were bad
anyway because with the way the secondaries were configured that the primary
of the fly would not see any shorted turns unless hooked up.  At least that
is the way the Sencore tech explained it.  I probably did not have my
hearing aids in right that day.
Hope this helps
Bill Sorensen
New Life Video & Audio
billans@xxxxxxxxxxxx
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----- Original Message -----
From: "Alvin Rose" <arose@xxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, May 14, 2002 7:02 PM
Subject: [TechAssist] Re: Daewoo model DTQ26s1fc color tv


>
> Hi Gary
> checked all of the caps in the flyback circuit  all ok
> this must be a common problem as I have two with
> identical troubles..I disconnected yoke and it still rings
> bad in circuit..ok out of circuit   hmmmmm.
>
> Gary McCartney wrote:
>
> > Alvin, I don't know about the flyback, but did you check the yoke? Try
> > ringing it. Also wonder if there could be a cap or diode involved with
> > any of the flyback windings that are shorted, causing the ring to test
> > bad?
> >
> > Gary McCartney
> >
> > McCartney Electronics
> > 7134 Fife Rd, RR 7
> > Guelph Ontario Canada N1H 6J4
> > Fax: (519)821-1530
> > email: number63@xxxxxxxxxxxxx
> >
> > Alvin Rose <arose@xxxxxxxxxxxxxxx> wrote:
> > >
> > > Hi Guys
> > > We have two Daewoo  models DTQS1FC  chassis cn-2001
> > > which have a shorted horrizontal output transistor q402.
> > > replaced the hot but it shorted again..Flyback rings bad in
> > > circuit
> > > but rings good out of circuit 56 rings...q804  hv switch is
> > > shorted
> > > also q803 and q805 are bad.I suspect the flyback but it rings ok.
> > >
> > > Is flyback  a common problem in this set..Any help would be
> > > appreciated
> > >
> > > Alvin Rose
> > > Radio & Tv Centre
> > > Marystown Nfld.
> > > 709-891-1883
> > >
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> > --
> >
> > Gary McCartney
> >
> > McCartney Electronics
> > 7134 Fife Rd, RR 7
> > Guelph Ontario Canada N1H 6J4
> > Fax: (519)821-1530
> > email: number63@xxxxxxxxxxxxx
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