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

  • From: "Matt De Young" <gibbys_service@xxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Wed, 27 Mar 2002 10:11:22 -0500


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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