[TechAssist] Re: Sears 509.14359, JVC chassis A67, trapezoid picture.

  • From: "George" <grndmstrg@xxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Thu, 30 Oct 2003 22:46:08 -0800

Kevin,

When a short appears on one of the coils it causes an imbalance in the
magnetic field that is generated which prevents the beam from moving as much
at one end, hence the trapezoidal raster. As for ringing yokes you should
ring each vertical and each horizontal coil separately with damper resistors
remove (one end will do) which I am sure you did if you used Sencore
equipment because that is the procedure in their manuals.

George
Afana Electronics
Moreno Valley, CA

----- Original Message -----
From: "Kevin" <kevintv@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, October 30, 2003 11:00 AM
Subject: [TechAssist] Re: Sears 509.14359, JVC chassis A67, trapezoid
picture.


> Swapped both vertical and horizontal with same trapezoidal shape.  How
> does the yoke fail so that it gives such a strange picture?  Both the
> vertical and horizontal yokes ring good on my Sencore.  Thanks.
>
> 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 Tel-Tek
> Electronics
> Sent: Thursday, October 30, 2003 5:12 AM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: Sears 509.14359, JVC chassis A67, trapezoid
> picture.
>
> A few years ago...answer would have been yes. With Pincussion circuits,
> answer is now 50%.
>     A quick test...change the leads (Vertical) on the yoke or the plug,
> if
> the configuration of the trapezoid remains the same, it's the yoke. Your
> next question will be can I remove the yoke and screw one
> on.....No....all
> will give you poor convergence.
>
> -Ed-
> Tel-Tek Electronics
> Ontario-Canada
>
> teltek3@xxxxxxxxxxxx
> ----- Original Message -----
> From: "Kevin" <kevintv@xxxxxxx>
> To: "TECH-ASSIST" <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, October 30, 2003 12:08 AM
> Subject: [TechAssist] Sears 509.14359, JVC chassis A67, trapezoid
> picture.
>
>
> > This TV is made by JVC for Sears.  The set is only 4 years old and has
> a
> > trapezoidal picture.  The picture is about 1/3 the width
> (horizontally)
> > on the top and 1/2 the width at the bottom.  Plus the convergence is
> way
> > off.  Does this sound like the yoke?  How would I test if it is the
> yoke
> > or not?  TIA.  By the way, this yoke is bonded to the tube.
> >
> > Kevin Wilks
> > Kevin's TV & Video Repair
> > Penticton BC Canada
> > kevintv@xxxxxxx
> >
> >
> >
> >
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