[TechAssist] Re: Sony HK short

Air get inside the pix tube???  Just look around at the end of the tube to
see any cracks...
Don B.
Dr. VCR    est:1994
20 Hanson Ave
Kitchener, Ontario
CANADA N2C 2E2
Tel 519-579-7112  Fax 519-579-1996
drvcr@xxxxxxxxxx

----- Original Message -----
From: "mark brock" <brock@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, March 31, 2003 3:11 PM
Subject: [TechAssist] Re: Sony HK short


>
> thats what I did,  had a heck of a bright flash and flash in the neck of
the
> pic tube itself,  then shut down immediately,   the tube did not like it,
> actually groaned and made a weird sound,  I'm confused as to why I need
to
> isolate the heaters from ground  when the KB to Heaters  is where the
short
> is.
>
> brock
> ----- Original Message -----
> From: "Jim Myers" <jr.myers@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Monday, March 31, 2003 12:09 PM
> Subject: [TechAssist] Re: Sony HK short
>
>
> >
> > Mark, sounds like you are confused about how to isolate the heater. It's
> > really quit simple, just cut the circuits on the socket board around the
> H1
> > and H2 socket pins so there is no connection to anything. Then take a
long
> > wire, any color will do, and wrap it around the flyback transformer
core,
> > the part that is outside the transformer body. Use about 4 turns,check
for
> > about 21 volts P-P with your scope then add turns or remove turns if you
> get
> > more or less than 21 P-P, then connect one end of that wire to H1 and
the
> > other to H2 on the CRT socket board.If there are other problems with the
> CRT
> > this will not fix it but it will fix any H to K short because the heater
> > will no longer be grounded through the flyback.
> > **************************************************
> > Jim Myers
> > Since 1972
> > Telrad Electronic Services Co.
> > Fort Wayne, IN 46815
> > *************************************************
> > ----- Original Message -----
> > From: "mark brock" <brock@xxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Monday, March 31, 2003 10:23 AM
> > Subject: [TechAssist] Re: Sony HK short
> >
> >
> >
> > Jeff:  and all
> >     forgive my ignorance here but never had this much problems in past,
> > usually a focus short,  anyway,  with the neck board removed I can
measure
> > 130 ohms from KR to either of the H terminals ( on the tube itself ),
> same
> > with KG,  so the green and red K's have 130 or so ohms between them and
> the
> > heaters.  the blue  ( KB) has 40 ohms,  it appears to be the problem,  I
> > tried to isolate using a donut with 5-6 wraps of red wire to H1 then 5-6
> of
> > white wire to H2,   no help,     I'm not sure about the wraps around the
> fbt
> > core,  thats going to be a short ?  i.e..  shorting H1 to H2 by way of
> wire
> > wrapped around the fbt core ?  is this right,   ( I did it, and it
flashed
> > in the neck, shut down immediately )  undid all the mess,  hooked back
up
> > like normal still have low resistance on KG pin,  what if I do the
> > highvoltage spark from the anode lead to KG?   its the one with the crud
> > arcing to some other pin inside ?   note:  when its cold the ohms are
all
> > the same on  R,G,and B,  but warms up and gets 40 ohms on blue,
> >    in summary, the problem is KB inside the tube,   measured with neck
> board
> > off.  doesn't the rejuvenator just blow high voltage to what ever pin is
> > shorted in an attempt to blast the carbon build up or crud out of the
way
> ?
> >  thanks again
> > brock
> >
> > ----- Original Message -----
> > From: "Shoreline Electronics" <jstielau@xxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Monday, March 31, 2003 8:03 AM
> > Subject: [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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