[TechAssist] Re: Sony HK short

Did you try just using the wire wrapped around the flyback core method?


Also....don't overlook the possibility of a problem in the blue driver
circuit.

==========================
Jeff Stielau
Shoreline Electronics Repair
344 East Main Street
Clinton,CT 06413
860-399-1861
860-664-3535 (fax)
jstielau@xxxxxxxx
==========================
"If you push something hard enough it will fall over."
Fudd's First Law of Opposition - Sir Sidney Fudd


----- Original Message -----
From: "mark brock" <brock@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, March 31, 2003 8:38 AM
Subject: [TechAssist] Re: Sony HK short


>
> Thanks Gary,George,Kevin and Tommylee,  for the info.  I used one of those
> red and white donut coils off of the old rca's  have several of them and
> used in past but won't work on this set,  I tried everything still either
> all blue bright with retrace and shutdown or  no picture at all,  when I
> isolated it in the past I looked for 21 volts peak to peak on the wire
ends,
> then attached to heaters after they were cut from the rest of the world,
> wonder if thats enough for this big Sony ?  it just went to black screen
> when I did that,  thought I blew it all together but when re connected was
> back to the blue screen,    this one may be shot ?  wish I still had a
> rejuvenator,  would be the second time I've needed it in about 5 years.
if
> I knew it would work this set would warrant its purchase,   I'll try some
> more and let you know what I find.
> brock
>
> ----- Original Message -----
> From: "Gary McCartney" <gary@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Sunday, March 30, 2003 11:34 PM
> Subject: [TechAssist] Re: Sony HK short
>
>
> >
> > I just did one with the torroid core donut last week. Worked fine. The
> > best thing about it rather than using turns of wire around the flyback
> > core, is that you don't have to guess at how many turns to make the
> > proper filament voltage. Just wrap 5 turns around one side of the donut,
> > then 5 turns at the opposite side and you have a 1:1 ratio transformer.
> > Slice the traces to the heater pins on the CRT board and connect the
> > primary winding to the circuit traces and connect the secondary winding
> > to the heater pins. Done.
> >
> > Only problem is I don't know where to get any more torroid donuts with
> > the proper characteristics for this purpose.
> >
> >
> >
> >
> > Gary McCartney
> >
> > McCartney Electronics
> > 7134 Fife Rd, RR 7
> > Guelph Ontario Canada N1H 6J4
> > Fax: (519)821-1530
> > email: gary (at) number63.ca
> >
> >
> >
> >
> >
> >
> > tomlee wrote:
> > >
> > > I remember somebody said about the  small  ferite donut can do the
> > > job.Primary on one half .Secondary on the other half .
> > >  I think it is a good idea. I never try but I will do it when The fly
> back
> > > does not have place to wind the
> > > wire.
> > > Dang
> > > TD electronics
> > > ----- Original Message -----
> > > From: "Kevin" <kevintv@xxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Sunday, March 30, 2003 1:28 PM
> > > Subject: [TechAssist] Re: Sony HK short
> > >
> > > >
> > > > Isolate the heater from ground.  There are a couple of ways to do
> this.
> > > > The easiest way is to take an 18-22 gauge insulated wire and wrap
the
> > > > middle of the wire 2 or 3 turns around the ferrite core of the
flyback
> > > > and then solder one end to H1 and the other end to H2.  You should
> > > > measure the heater voltage before disconnecting the heater circuit
> from
> > > > H1 and H2.  You may have to play with the gauge of wire and number
of
> > > > turns to get it close to the original heater voltage.  Unless
> something
> > > > else happens to the pix tube, this should be a permanent fix.
> > > >
> > > > The second way involves using a 120 volt to 6 volt transformer.  But
> > > > this way is more difficult because you have to have the type of
> circuit
> > > > that has a relay that is activated by the micro and then the relay
> turns
> > > > the set on.  Also the transformer costs more money than a piece of
> wire.
> > > > The wire method also is easier to figure out (at least for me!)
> > > >
> > > > Kevin Wilks
> > > > Kevin's TV & Video Repair
> > > > Penticton BC Canada
> > > > kevintv@xxxxxxx
> > > >
> > > > -----Original Message-----
> > > > From: techassist-bounce@xxxxxxxxxxxxx
> > > > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of mark brock
> > > > Sent: Sunday, March 30, 2003 12:18 PM
> > > > To: techassist@xxxxxxxxxxxxx
> > > > Subject: [TechAssist] Sony HK short
> > > >
> > > >
> > > > I have a 35" Sony in with bright blue and retrace then shutdown,  I
> find
> > > > 46
> > > > ohms from KB ( pin 10 ) to either  H1 or H2,  tried the hk short
> removal
> > > > using hivoltage to G1 and G2 but no help,  since the short doesn't
> > > > involve
> > > > G1 and 2 should  I be arcing the H's or KB pins instead ?  may have
to
> > > > try
> > > > the isolation procedure  if so,  is this put on the H1 and H2 either
> or
> > > > both
> > > > or do I Isolate KB from the board ?   now are you as confused as I
am,
> > > > I've
> > > > had good luck in past by using the G2 procedure,  anyway,  customer
> > > > won't do
> > > > the new tube thing but willing to spend a little on a short term fix
?
> > > > sure
> > > > appreciate any clarification on this method.  thanks for all your
help
> > > > brock
> > > > Brock Electronics
> > > > R.R.4 box 237
> > > > 5208  cr.3385
> > > > Independence Ks. 67301
> > > > 620-331-0235
> > > > fax  331-7191
> > > >
> > > > brock@xxxxxxx
> > > > mailto:brock@xxxxxxx
> > > > Zenith*Philips*Peavey*Fender*Crate
> > > > we work on all brands,makes,models
> > > > of anything that plugs in the wall
> > > >
> > > >
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