[TechAssist] Re: Sony HK short

Yes, isolate both heater pins by disconnecting them from the heater
circuit.  They will still measure a dead short to each other, which is
normal.  If this doesn't bring back a good picture then your picture
tube is shot.

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
support@xxxxxxxxxxxxxxxxxx
Sent: Sunday, March 30, 2003 2:52 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: Sony HK short


Kevin,
With this method, do you still isolate both heater pins?
I've always been a little cautious to do this. It just seems it would
make a direct short to ground on the heater pins. Then, just
wrap it around the flyback a couple of turns?

Jeff Dougherty
Intrepid Video TV/VCR
263 S Front St
Steelton PA 17113
fax...717-564-4952
www.intrepid-video.com www.tech-repair.net

----- Original Message -----
From: "Kevin" <kevintv@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Sunday, March 30, 2003 4:28 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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