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Testing & Repairing a Y-Buffer board

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    Testing & Repairing a Y-Buffer board

    I know that the upper and lower Y-Buffer boards have something wrong with them. When they are plugged in I get a D12V error code. When I leave them off, there is no error.

    What exactly goes bad, the surface mounted ICs? How do I test these boards (other than plugging them in)? Do I need to replace the ICs to repair the board? That's an obvious, kind of dumb question but I have to ask.

    I'm not to keen on soldering surface mount IC's with 60 pins but I also don't want to sped $150 on new boards.

    The boards are

    LJ41-02760A (upper)
    LJ41-02761A (lower)

    The TV is a Sanyo DP42746.

    I've already replaced the bad caps on the main power board and the Y-SUS.

    I've been through this thread https://www.badcaps.net/forum/showthread.php?t=18707 and it was helpful including the links.

    #2
    Re: Testing & Repairing a Y-Buffer board

    Look over each IC closely if they don't have heat sinks attached. Lots of times in the center of the IC on the bad one you might see a hole or burnt mark.

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