[TechAssist] Re: Horizontal output overheating.
- From: "D Panday" <dpanday@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 16 Dec 2002 10:31:16 -0500
Totally agree, I remember HITACHI uses 2 or 3 resistors in
they HOUT emitter cct on the older unit.
Panday
>From: "Jose Reyes" <jr@xxxxxxxxxxx>
>Reply-To: techassist@xxxxxxxxxxxxx
>To: <techassist@xxxxxxxxxxxxx>
>Subject: [TechAssist] Re: Horizontal output overheating.
>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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