[TechAssist] Re: Hitachi 50UX58B Green Convergence(update)
- From: "peter" <pe.kow@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 2 Sep 2004 22:34:33 -0400
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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