Question about Hitachi 50UX57B 50" Rear Projection Television

1 Answer

Strange Image Flubbering/Convergence Problem, Flutters From Dark Picture To Light Picture.

I recently picked up this 50" Toshiba RPTV free from a friend who upgraded to a big plasma, and didn't want to try and mess with this one. One symptom I've noticed is that the screen will go from being normal brightness to suddenly much darker. I have attempted to re-converge the image with the convergence board I unscrewed off the front of the TV. Although when I attempt to align the colors, it will sometimes be fine, normal colors, normal brightness, and I can get the picture relatively converged, but then one of the colors seems to flubber around. It then seems to switch from normal brightness to darker brightness and the convergence is completely different from what I was just converging. I haven't done anything other then tool around with the convergence board, and I gave it a well needed dusting. Thanks for any help, ~Trevor

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  • George B Dec 05, 2006

    To sum up the above. The convergence does NOT stay. I forgot to mention that my specific model # is 50UX7K, manufactured in 1991.

    Anyone help greatly appreciated,

    Thanks much,

    ~Trevor

  • George B Dec 09, 2006

    Thanks for the help, I'll replace the STKs and see if it helps!

    ->Oh yeah, the RPTV is a HITACHI, NOT a Toshiba, which I mistakenly typed above!

  • George B Dec 09, 2006

    I ordered replacement parts for all 4 of the STKs, they should come in a few days.

    Can you explain a little bit more what a Hyper Module is? And where I might find it? I've looked through the service manuals PDF but haven't found it yet. Does it have a different alternative name?

    Thanks!

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You "tooled around with the convergence board" well this chassis has several problems if the convergence doesnt hold replace both stks resolder around that area per tosh tech bulletin the bright problem is probably the hyper module all toshs should be checked with toshiba website to see if they were part of the recalls for power supply caps

Posted on Dec 09, 2006

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1 Answer

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Your convergence has failed and needs to be repaired. Once quick test is to goto your convergence menu and see if you can adjust red and blue. If not its has failed and needs to be fixed. You can call in a repair shop or you can get the parts and instructions from www.TvRepairKits.com and do the repair yourself. Its a fairly easy DIY fix.

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ADJUST THE ELECTRICAL FOCUS. AND THERE IS A MECHANICAL FOCUS ALSO. SET THE ELECTRICAL FOCUS BY LOOKING DIRECTLY INTO THE TUBE AND ADJUST IT SO THE TUBE SURFACE IMAGE IS SHARPEST. THEN LOOKING AT THE REAR OF THE SCREEN ADJUST THE MECHANICAL FOCUS, ON THE LENS UNTIL IT IS SHARPEST. ALSO IT MIGHT NEED A CLEANING OF LENS&MIRROR. DIRT AFFECTS BLUE LIGHT FIRST.

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The colors seperating is a convergence problem, as far as being dim this may be related but the TV likely needs service adjustments.

convergence output IC problem. convergence board would have to be removed - remove and replace 2 STK IC's and check the surrounding resistors. Shops usually $200-$400 Be sure to vote/rate me if this helped Thanks!
See link for more detail
http://www.ehow.com/how_4575598_yourself-projection-tv-repair-convergence.html

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good this tells you that the convergence IC's need to be replaced
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also check r417 if bad replace.
replace 2 ea sth 392 110
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you have done said it vertical lines then you will have to take your tv to a tech for repairs.good luck.

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