[TechAssist] Re: Hitachi 50UX58B Green Convergence(update)
- From: "Hoyt's TV" <hoytstv@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 4 Sep 2004 08:41:29 -0400
How big and how close are the non magnetically shielded stereo speakers that
are sitting next to it?
Russ Hoyt
Hoyt's TV
Exeter, NH
----- Original Message -----
From: "peter" <pe.kow@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, September 02, 2004 10:34 PM
Subject: [TechAssist] Re: Hitachi 50UX58B Green Convergence(update)
> Would it be possible to have a bad shadow mask Peter Kowalik
> pe.kow@xxxxxxxxxxxx Keith's Stereo Burl ON
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Jim Shupe
> Sent: September 2, 2004 9:45 AM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Hitachi 50UX58B Green Convergence(update)
>
> Hey Alvie, everyone....
>
> To update my previous post, I'm offering the
> following:
>
> I neglected to mention that before I posted the
> request, I had swapped the yoke leads first
> (convergence, red & green), then the deflection yokes,
> and finally I physically swapped the yoke assemblies,
> all with the result that GREEN was always the
> offending color.
>
> After I posted my request at lunchtime (I come home
> and take my shoes off for forty minutes), I put the
> yokes back to original and played with the green again
> for a while... and DUH!!, I realized that I had
> forgotten to check the pattern with no correction
> applied... I unplugged the green convergence yoke and
> saw that the distortion was still in the same corner.
> The only conclusion I can make after all this is
> that the green tube is defective. I can't, though,
> understand WHAT about the tube could be causing this
> problem. Can anyone see anything I've missed?
>
> Thanks to Alvie for the succinct response to my
> post..I think I covered the same territory but in a
> less efficient manner, maybe.
>
> BTW...I didn't consider any of the mechanical
> adjustments because they were all still "doped" from
> the factory... and customer said the problem developed
> a few weeks before the set went dead.
>
> If anyone sees a defect in my reasoning, please
> respond so I don't order a tube and embarass myself.
>
> TIA,
> Jim Shupe, CET
> Lloyd's TV
> Yucca Valley, CA
>
>
>
> --- "Alvie Rodgers C.E.T." <rodgers@xxxxxxxxx> wrote:
>
> > Hey Jim:
> >
> > First check and be sure the
> > "Beam Shape"
> > and "Beam Alignment" adjustment
> > magnets are set up correctly.
> > Affects outside edges.
> >
> > Clear the RAM and check for Red and Blue Offsets.
> >
> > If no help,
> >
> > Do not SAVE to ROM before you're sure what I'm
> > suggesting works.
> > If after all my suggestions below have no effect,
> > then simply turn the power
> > off
> > and back on and you'll return to the old settings.
> >
> > Clear the RAM, then Read the OLD ROM data,
> > then enter the 3X3 mode.
> > Adjust the center (1 point) and outsides (8 points).
> > Can your correct.
> >
> > Continue with 5X7 mode.
> >
> > Use the Calculate function often.
> >
> > Finally you'll have to make a comparison for the
> > adjustment point (location)
> > using
> > a different CRT and Yoke assembly.
> > Do this simply by swapping the Yoke Plug for the Red
> > and Green.
> >
> > Do not pay attention to the fact that the
> > convergence is completely out,
> > just
> > pay attention to the location. While adjusting
> > Green, look at the Red in the
> > same location that doesn't adjust correctly now in
> > green.
> > If you can adjust Green and see the Red functioning
> > correctly in the same
> > location,
> > then it's a conv. yoke problem.
> > If the problem stays the same, you'll at least know
> > the problem is either in
> > the circuit
> > or the DCU.
> >
> > After that, if it's not the yoke, swap the GH and GV
> > signals from the DCU
> > with the RH and RV.
> > Now by adjusting Red observe the Green in the area
> > of fault.
> > Can you correct?
> > Yes, your DCU is defective.
> > If no, the you've isolated it to the Output section
> > from the DCU to the
> > Yoke.
> >
> > ***************************************************
> > Don't forget to check the Hitachi Web Site
> > for any additional information:
> > http://www.hitachiserviceusa.com
> >
> > If this information helps in any way and/or you
> > repair the unit,
> > please POST your findings so that all can benefit
> > from your
> > experience.
> > "Let's work together".
> >
> > Alvie Rodgers C.E.T.
> > Technical Writer/Trainer
> > Hitachi Home Electronics
> >
> > ***************************************************
> > ----- Original Message -----
> > From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxx>
> > To: "Alvie Rodgers C. E. T." <rodgers@xxxxxxxxx>;
> > <jim@xxxxxxxxxxxxx>
> > Sent: Thursday, September 02, 2004 6:05 AM
> > Subject: Hitachi Model 50UX58B green convergence
> >
> >
> > Jim,
> > I am forwarding this to Alvie Rodgers from Hitachi
> > to see what he has to say
> > about it.
> >
> > Bob Waterman, CET. #RI-28
> > Master Technician License #9109
> > Service Manager / Parts Manager
> > Gemini Computer, TV, & Security Alarms
> > (508)695-7302
> > (508)695-7769 FAX
> > geminitv@xxxxxxxxxxx
> > geminitv@xxxxxxx
> > www.geminicomputertvsecurityalarms.com
> >
> >
> > ----- Original Message -----
> > From: "Jim Shupe" <jim@xxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Wednesday, September 01, 2004 4:01 PM
> > Subject: [TechAssist] Hitachi Model 50UX58B green
> > convergence
> >
> >
> > > Hi All....
> > >
> > >
> > > I have a 50UX58B that came to me with just the
> > lower
> > > right corner out of convergence. I changed the STK
> > and
> > > one resistor that had increased in value...but no
> > > help.
> > >
> > > The green also looks thick and out of focus at
> > that
> > > corner, and appears to have hysterisis around the
> > > corner point: that is, when I adjust the line(H or
> > V)
> > > toward alignment, it approaches, then will swing
> > too
> > > far past correct position.
> > >
> > > The degree of distortion appears to be related
> > to
> > > screen content as well...it moves in and out of
> > the
> > > corner with scene changes, etc.
> > >
> > > Has any one seen this or anything similar with
> > this
> > > set?
> > > I talked to Hitachi and the tech said "sorry...
> > no
> > > silver bullet here."
> > >
> > >
> > > TIA
> > > Jim Shupe, CET
> > > Yucca Valley, CA
> >
> >
> >
> >
>
>
>
>
>
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