[TechAssist] Re: Horizontal output overheating.

  • From: "Jose Reyes" <jr@xxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Mon, 16 Dec 2002 10:13:25 -0500

I have heard of the same thing,
because their switching times are different.
One will start conducting before the other,
hence, use most of the current.
Unless small value resistors are installed.
I never read up on this, just repeating what I was told.

Jose' Reyes
@ Kwik Fix TV
     619 Pondella Rd.
     N. Ft. Myers, Fl.  33903
     E-Mail:    jr@xxxxxxxxxxx

----- Original Message -----
From: "Gary McCartney" <gary@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, December 16, 2002 10:01 AM
Subject: [TechAssist] Re: Horizontal output overheating.


>
> I always read that using two semiconductors in parallel will cause the
> one of them to hog all the current, unless you install a small current
> limiting resistor (perhaps 0.01 ohm or there abouts) in the paths of the
> 2 emitters. Has anyone else heard of this?
>
>
>
>
> Gary McCartney
>
> McCartney Electronics
> 7134 Fife Rd, RR 7
> Guelph Ontario Canada N1H 6J4
> Fax: (519)821-1530
> email: gary (at) number63.ca
>
>
>
>
>
>
> teltek2 wrote:
> >
> > I agree...using 2 will put you into price range of OEM.
> >
> > Fix the fault..install OEM part, ship it. Done.
> >
> > -Ed-
> > Tel-Tek Electronics
> > Ontario-Canada
> >
> > teltek2@xxxxxxxxxxxx
> > ----- Original Message -----
> > From: <HSWAD@xxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Monday, December 16, 2002 9:09 AM
> > Subject: [TechAssist] Re: Horizontal output overheating.
> >
> > > Wouldn't it be about the same price to replace with the correct part?
> > > Modifications put you in a responsible position . Hollis Bates, field
> > > engineer-retired                       In a message dated 12/16/02
5:13:25
> > AM
> > > Eastern Standard Time, villyboor@xxxxxxxxx writes:
> > >
> > >
> > > > Subj:[TechAssist] Re: Horizontal output overheating.
> > > > Date:12/16/02 5:13:25 AM Eastern Standard Time
> > > > From:<A HREF="mailto:villyboor@xxxxxxxxx";>villyboor@xxxxxxxxx</A>
> > > > Reply-to:<A
> > HREF="mailto:techassist@xxxxxxxxxxxxx";>techassist@xxxxxxxxxxxxx</A>
> > > > To:<A
> > HREF="mailto:techassist@xxxxxxxxxxxxx";>techassist@xxxxxxxxxxxxx</A>, <A
> > HREF="mailto:techassist@xxxxxxxxxxxxx";>techassist@xxxxxxxxxxxxx</A>
> > > > Sent from the Internet
> > > >
> > > >
> > > >
> > > >
> > > > Villy Boor
> > > > Boorelec Durban
> > > > --
> > > >   Perhaps I am a wee bit off the topic but I have been finding many
TVs
> > > > with troubles after the horizontal output has been changed. What I
find
> > is
> > > > if you get the expensive manufacturers transistor all is well, the
> > generic
> > > > fails. My tip here is use 2, parallel them up and there is no need
to
> > > > increase heat sinks as there will be less heat, the input inpedance
> > drops
> > > > so it is more stable, as yet after 2 years on sets where no faults
were
> > > > found and the transistor failed, I have had no returns. Your
comments
> > > > welcomed, Villy.
> > > > On Sun, 15 Dec 2002 08:13:25
> > > > Paul Medvetz wrote:
> > > > >We have a Sony KV-32S35 , Set came in dead with shorted horiz.out,
> > > > reg.Q601 and Q602, Replaced Q601,Q602, Q502, VDR601,R607,C502.Set
now
> > plays
> > > > but Q601,Q602, get very hot just after three minutes,This set was in
> > shop
> > > > two months ago for shorted flyback and horiz.out transistor.Don't
want
> > to
> > > > leave it on any longer I know it will short again,Also I did go over
> > > > connections in horiz. thanks in advance for any help.
> > > > >
> > > > >Paul Medvetz
> > > > >TV- Service-CO.
> > > > >Hazleton,Pa. 18202
> > > > >paulcho@xxxxxxxx
> > > > >
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