[TechAssist] Re: Hitachi 50UX58B Green Convergence(update)
- From: "Damon" <damon101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 4 Sep 2004 04:58:33 -0500
Hey! We had a Toshiba PTV with a bad red tube also!! Upper Right Corner was
bent and blurry and had that "hysteresis-like convergence" too..... Bent and
Blurry.......reminds me of some Phillips alignments I've done...
The Vacationer
Damon Brunger
----- Original Message -----
From: "tvservice" <tvservice@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, September 03, 2004 9:03 AM
Subject: [TechAssist] Re: Hitachi 50UX58B Green Convergence(update)
| Jim,
| I have had the same problem in Toshiba F line on the red tube
| lower left corner folded over and would not adjust
| replacing crt fixed
| Robert
| tvservice@xxxxxxxxxxxxx
| H & H Electronics Inc
|
| ----- Original Message -----
| From: "Jim Shupe" <jim@xxxxxxxxxxxxx>
| To: <techassist@xxxxxxxxxxxxx>
| Sent: Thursday, September 02, 2004 8:44 AM
| 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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