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

  • From: "Don Hartigan" <hartstv@xxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Thu, 28 Mar 2002 13:01:57 -0400

Matt, I scanned & emailed the power supply for this unit to your email
address.Did you receive it?......Don ..........
HARTS-TVCR''ASC''
9-Robert St.,Oromocto,NewBrunswick,CAN
Tel#506-357-9785Fax#506-357-6010
----- Original Message -----
From: "Matt De Young" <gibbys_service@xxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, March 28, 2002 9:43 AM
Subject: [TechAssist] Re: Help with Sony KV27ts36, Blows q601& 602


>
> If I understand this correctly,  the voltage measurement is off of the
> emitter of q601.
>
> I'll jumper the relay and test again..
>
> thanx.
>
> ----- Original Message -----
> From: "Damon" <DAMON101@xxxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Wednesday, March 27, 2002 10:32 PM
> Subject: [TechAssist] Re: Help with Sony KV27ts36, Blows q601& 602
>
>
> >
> > Did you jumper the relay 1st before bringing up the variac? You need to
do
> > that. You may also have to take it up up 60 v ac to get an unrounded
> signal
> > , but the duty cycle should be apparent at 30 volts ac. This duty cycle
> > should be 50% so that both the transistors are doing equal work,
tolerance
> > is 51-53%, but I don't trust that!   30 volts AC should measure about
> > 42-43 Vdc (30v x 1.4 = peak ac). Run it at 30 vac, but bring it up
gently,
> > you should be able to see a balanced waveform before you even get to 30
> vac.
> > Now if it looks balanced, then verify at 30, then gently up to 60  to
test
> > for minor slope and flat top (minor ringing on leading edge of flat
top).
> >
> > If it looks good at 60 Vac then start looking at the horiz circuit or
> > especially look at the AUDIO circuit for shorts, the audio circuit has
no
> > shutdown or fusing protection on quite a few models, they just started
to
> > fuse those circuits in the last 2 to 3 years.
> >
> > Might be smart to remove the horiz output and audio output (or disable
the
> > audio B+) to test the power supply and save those transistors. BTW $9.00
a
> > transistor is rather hi in my opinion, check
http://www.mcmelectronics.com
> > or some where else.
> > Damon Brunger
> > damon101@xxxxxxxxxxxxxx
> > Telrad Electronic Services
> > Ft Wayne, IN 46815
> > ----- 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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