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I have a JVC, AV48WP34, with the following problem. The DCU is defective on the convergence module. This was verified by installing it in a serviceable set. I ordered a replacement module and the original failure was corrected, but a new one appeared. When convergence is attempted the blue and green crosshairs are present but the red crosshair is not. It does not appear even when the screen control is turned up. I assume that whatever is causing this red failure may have damaged the original DCU. Anyone have this experience or an idea what might be happening?

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  • Phil Day Apr 24, 2010

    Evidently you did not read what I said in the original note. I am a servicer and already did what you suggest before ordering a replacement SSB-5051A. I verified it is good by checking it in my serviceable set. The problem is some where in the signal board. You need to pay attention. SOME WIZ YOU ARE.

  • Phil Day Apr 24, 2010

    I have a JVC, AV48WP34, with the following problem. The DCU is defective on the convergence module. This was verified by installing it in a serviceable set. I ordered a replacement module and the original failure was corrected, but a new one appeared. When convergence is attempted the blue and green crosshairs are present but the red crosshair is not. It does not appear even when the screen control is turned up. I assume that whatever is causing this red failure may have damaged the original DCU. Anyone have this experience or an idea what might be happening?
    I verified the new unit is good by checking it in my serviceable set. the problem must somewhere in the signal board area.

  • Phil Day Apr 24, 2010

    I verified the replacement board is good in a serviceable set.

  • Phil Day Apr 24, 2010

    Do you have another solution to my problem?

  • Phil Day Apr 25, 2010

    The replacement convergence module checked good in a serviceable set.

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I had an issue similar to yours and found the information at the following website extremely helpful:

http://www.hometheatershack.com/forums/diy-repair-maintenance/5600-crt-based-rptv-convergence-repairs.html

Hopefully you will find the same.

Posted on Apr 25, 2010

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Hi Phil
Couple of questions for you bout the problem.

  • Where did you get the replacement board from.
  • Is it a second hand or salvaged part, or new from manufacturer.
  • Does it appear to be used at all.
I would remove and re-seat all connections to and from the board also. I ask about the origins of the board, i have had faulty reworked boards from suppliers previously myself. Or may have come out of a problem set and recycled for spares. Is worth checking with the suppliers of the part for any warranty they offer, and use this to help get to the bottom of the problem. It may mean getting another board, to eliminate it as an offending part.
regards robotek

Posted on Apr 24, 2010

  • Graeme Ross
    Graeme Ross Apr 24, 2010

    Sorry mate... the system did not allow me to see your comments till after I posted, "already verified board a good worker in other set". My advice not much help to you either.

  • Graeme Ross
    Graeme Ross Apr 25, 2010

    I am a advocate of Murphy's law. Sometimes, for inexplicable reasons, a Tech can face the most confusing circumstances, often bearing totally ZERO rhyme or reason.
    In my more than 20 years running service departments for electronics, strange problems will periodically prevent the progression of a job. This could be on a set of unknown reasons for its failure, and then the consequential new symptoms.


    • It may have suffered a power surge, a lightning strike

    • poor connectivity of disturbed connections

    • crappy lead free soldering

    • low quality parts
    Of course these failure inducing contributing factors can sometimes eventuate to situations where the original symptomatic fault is solved by replacing parts, to find that a completely new problem arises from the service work.
    I know that you as a tech as probably painfully aware of "the Curse". I know you are looking for a fix to the problem, but changing out further parts is the only way you are going to get through this one mate. If you have a serviceable set at your disposal, then you have all you need to get to the bottom of this.
    I hope that someone can allude to a more direct solution for you here, Good luck.


    regards
    robotek

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Surrounding components needs to be checked at the DCU.
There may be weak capacitors and or resistance at the voltage input and output points on the circuit itself there by damaging the unit. Incorrect voltages will cause IC's to fail over a period of time.

Posted on Apr 23, 2010

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