Question about Toshiba REGZA 42WLG66 42 in. HD-Ready LCD Television

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When I plugin the two relais on the power supply will swich on and off permanently ! Does anybody have an idea which board can cause this problem

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  • Carlos Santana Feb 23, 2012

    Dear Francoise !
    So far I found out now, is the 12V instabile; it comes up, the relais swiches on, and then the 12V falls down, so the relais swiches off ... and so on.
    The transformer secondary diodes are OK, so it must be the regulator. Unfortunately do I not know how to get it: it is the Allegro STR-W6765.
    It contains the controller and Mosfet. Digikey does not have it; do you know a distributor in Europe ?
    Thanks a lot, regards !

  • francoise cleofas
    francoise cleofas Feb 24, 2012

    hi sir sorry for the delayed response i'm not so familiar with some parts distributor in europe, have you been tried to inquire at shopjimmy.com although usually they have available set or module but you can tried.

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It's hard to pull teeth over the net, however, I would suspect the power supply panel first. You can disconnect the inverter module and see if you get sound back. If its a high end set then the power supply will detect what you have done and not let the set start up completely but you will notice a change in the relay cycle. That will tell you that there's a short on the inverter board.

Posted on Feb 17, 2012

Testimonial: "Thanks for your help dear Jim ! I'll try this weekend and let you know ! Karl"

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