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Sharp aquos LC-20S5U will not power on. red light in front is on when power is turned on red light goes off and nothing happens.

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The power board has failed and while possible to replace, is pretty expensive if the unit isn't under warranty. You can't get the part or schematics directly from Sharp unless your factory service. Tritronics might have it, but you'd have to check with them as to availability and price - and you'll pay retail. Secondly, I've seen malfunctioning supplies damage the control board. If you find the inverter supplies are damaged on the panel, go shopping.

Only thing I can offer in terms of repair is check the main filter caps on the secondaries of the inverter supply. If I remember correctly, they're 2200uF @ 25V and 1200uF @ 35V. They'd be "pregnant" or out of tolerance. You have to pull all of them and check with a meter to confirm.

DO NOT USE STANDARD CAPS. You MUST use caps rated for high heat (105 degrees C) and high ESR. They're designed to handle the frequency used for the supply and don't drift as the set plays. MCM offers these caps in their components section.

Good luck,
Mark

Posted on Nov 15, 2008

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