[TechAssist] Re: Help with Sony KV27ts36, Blows q601& 602

  • From: "GARY" <gchambe3@xxxxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Wed, 27 Mar 2002 18:16:09 -0500


I just realized on the prior post I was wrong!!!!!!
at 30 vac the 135v starts to come up and you should monitor it as ac
increases that it (135v)doesnt increase past 135v. you will reach 135v at
about 50 or 60 vac.
I do apologize.
I have repaired many of these, just spoke before I thought.
I hope this old age doesnt cause more problems.....
(wish I was young again!)
Gary
CHAMBERS TV
BRADENTON,FL
SINCE 1982
----- Original Message -----
From: "GARY" <gchambe3@xxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, March 27, 2002 5:59 PM
Subject: [TechAssist] Re: Help with Sony KV27ts36, Blows q601& 602


>
> Yes, the 135v should be up at 30 vac on variac.
> Done plenty of these.
> you may want to call fulton radio(800-248-0898) and ask them to send you a
> page on this circuit explaing trouble shooting.
> call between 3pm and 4pm est.ask for tech assistance and have model number
> ready.
> I had a copy faxed to me years ago, but was on thermal paper and it faded
> out and is unreadable.It will get you very aquainted with this circuit.
> gives scope readings etc...
> Sounds like a resistor may still be open in this circuit.
> Hope this helps,
> Gary
> CHAMBERS TV
> BRADENTON,FL
> SINCE 1982
> ----- Original Message -----
> From: "Matt De Young" <gibbys_service@xxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Wednesday, March 27, 2002 10:11 AM
> Subject: [TechAssist] Help with Sony KV27ts36, Blows q601& 602
>
>
> >
> > Replaced the caps, and checked resistors.  Changed the 6.8ohm resistor
to
> > 4.7 1/2w.  Now I bring up the AC voltage to 30v(double checked with
meter)
> > and the 135v line is only at about 0.4v.  checked the voltages around
the
> > converter transistors and the voltages are 1/4 of normal I think it
should
> > be.  The part I am worried about is the 135v line, you mention it should
> be
> > at 135v when the variac is at 30v AC.  I just am unsure of this, I do
not
> > want to destroy another pair of $18 transistors...
> >
> > Thanx
> >
> >
> >  Matt De Young @ Gibbys Electronics
> > St. Catharines, Ont Canada
> > gibbys_service@xxxxxxxxx
> >
> >
> > ----- Original Message -----
> > From: "GARY" <gchambe3@xxxxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Thursday, March 21, 2002 9:47 AM
> > Subject: [TechAssist] Re: Help with Sony KV27ts36, Blows q601& 602
> >
> >
> > >
> > > First, make sure the horiz out did not short again, if it did, replace
> > small
> > > electrolytic in base of horiz driver transistor circuit.
> > > Also many times the small caps in the converter circuit must be
changed,
> > > usually marked 224 and 681, six all together.
> > > also make sure the two 82k resistors(in converter circuit) are both in
> > > tolerance,sometimes one will increase in value and off balance the
> > switching
> > > of converter circuit.
> > > to save damage while testing use a variac,start at 0v and slowly
> increase
> > to
> > > 30 v,(while monitoring the 135v)at this point the converter will
output
> > > 135v.any increase above that means a "no go" so shut it down.
> > > good luck,
> > > GaryCHAMBERS TV
> > > BRADENTON,FL
> > > SINCE 1982
> > > ----- Original Message -----
> > > From: "Matt De Young" <gibbys_service@xxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Thursday, March 21, 2002 8:54 AM
> > > Subject: [TechAssist] Help with Sony KV27ts36, Blows q601& 602
> > >
> > >
> > > > This unit blows the voltage converter transistors Q601 and Q602 as
> well
> > as
> > > the fuse resistor.  I have changed the H.O.T. and have soldered all
> > > components in the Horizontal section as well as in the Power supply
> > section.
> > > I have checked the VDR's and they all test open.
> > > >
> > > > Any help is appreciated.
> > > >
> > > > Matt De Young @ Gibbys Electronics
> > > > St. Catharines, Ont Canada
> > > > gibbys_service@xxxxxxxxx
> > > >
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