[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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