Re: Mitsubishi VS-582R focus malfunctions

From: Mike (temp_at_temp.com)
Date: 06/08/04 

Date: Tue, 08 Jun 2004 17:54:44 GMT

The STK4275 IC heatsink gets so hot, you cant touch it.

the heatsink that has the 2 convergence ICs mounted on, runs reletively
cool.

hmm.

"Mike" <temp@temp.com> wrote in message
news:8c9xc.7403$Oa7.1968@fe1.columbus.rr.com...
> I have this TV I repaired the vertical sections fine with no problem.
>
> The set now produces a picture, with the exception of a bad tuner.
>
> the problem is, the focus will not work properly.
>
> this set doesnt use the typical electrostatic focusing that normal TVs
use.
> This tv uses electromagnetic.
>
> The problem is, sometimes it works, I can refocus it with the 3 pots on
the
> convergence board. Sometimes, the focus just jumps around like crazy.
> sometimes its just one color, sometimes its all 3 colors.
>
> Other times, the 3 pots dont take affect at all, and if so, very little.
>
> it looked like it was a bad solder joint somewhere. I resoldered the
entire
> deflection board, and convergenced board, up and down, left and right and
> still cannot get the focus to act properly!
>
> i cleaned the pots, and it still doesnt help. I need to know exactly how
the
> focus circuit works, and which part(s) are involved into making it focus.
>
> If i pull the 3 plugs going into the convergence board, that are near the
> focus pots, the pots dont work anymore obviusly, but the focus is perfect!
> except for the red, and it wont bounce around at all, until I reconnect
the
> wires to the focus area.
>
> one time I was able to push a little bit on the deflection board, and the
> focus came in clear. but now, I cant do that. I dont see any cracks
anywhere
> on the convergence board, or the deflection board. I only had to repair
one
> trace, due to a fried diode that supplied the vert IC.
>
> Any ideas? please please its beginning to irritate me. Will someone tell
or
> show me exactly which parts, or which area of the deflection board is
> responsible for focus supply and drive??
>
> Thanks!
>
>

Relevant Pages

  • Mitsubishi VS-582R focus malfunctions
    ... resistor or a glass diode, ... Mi> The problem is, sometimes it works, I can refocus it with the 3 pots ... Mi> entire deflection board, and convergenced board, up and down, left and ... Mi> If i pull the 3 plugs going into the convergence board, ...
    (sci.electronics.repair)
  • Re: Mitsubishi VS-582R focus malfunctions
    ... > Could there be an open component rather than a broken trace, ... > Mi> The problem is, sometimes it works, I can refocus it with the 3 pots ... > Mi> entire deflection board, and convergenced board, up and down, left ... > Mi> If i pull the 3 plugs going into the convergence board, ...
    (sci.electronics.repair)
  • Re: Mitsubishi VS-582R focus malfunctions
    ... > Other times, the 3 pots dont take affect at all, and if so, very little. ... > If i pull the 3 plugs going into the convergence board, ... > one time I was able to push a little bit on the deflection board, ...
    (sci.electronics.repair)
  • Mitsubishi VS-582R focus malfunctions
    ... Other times, the 3 pots dont take affect at all, and if so, very little. ... If i pull the 3 plugs going into the convergence board, ... one time I was able to push a little bit on the deflection board, ... I only had to repair one ...
    (sci.electronics.repair)
  • Re: Mitsubishi VS-582R focus malfunctions
    ... is the red convergence, 1 is the blue convergence, one is an STK4275(focus ... > Other times, the 3 pots dont take affect at all, and if so, very little. ... > one time I was able to push a little bit on the deflection board, ...
    (sci.electronics.repair)