[TechAssist] Re: Daewoo model DTQ26s1fc color tv
- From: Alvin Rose <arose@xxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 15 May 2002 17:06:09 -0700
Hi Bill
Ringing the flyback in the circuit produces 0 rings and
out of circuit 56 so I guess the flyback is ok.
This set has a lot of parts problems as it is quite common
in the 26 in screen sizes..The Output transistor shorts
when power is supplied.I have some technical info which
should solve troubles and will check the circuits you advised.
thanks for the reply..your help is appreciated.
Alvin
Radio & Tv Centre
Marystown, Nfld.
Bill S wrote:
> 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
> - - - - - - - - - - - - - - - - - - -
>
> ----- 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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