Question about Sharp Aquos LC-20B4U-S 20 in. LCD EDTV

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Sharp aquos hums

Hums

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Check and replace the audio output board. Visit the site named 'Electro-help' for more details. Click this link. View it in "Timeslide" or "Flipcard" option, which can be selected from the drop down box menu by the [Sidebar] tag, at the top left corner of the display window. You can also click the [Home] tab to see the latest updates. It will make search easy. There are more than 1350 posts to different brand TVs now. Pull up older posts there.

Posted on Dec 01, 2012

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Posted on Jan 02, 2017

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1 Answer

Will not spin out, just hums


Probably a capacitor problem, see Amazon.

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1 Answer

Our Sharp R-4H88 microwave popped a fuse. Door switches, all OK. High voltage rectifier shows "infinite" R. both directions. H.V. xformer hums when plugged in with door shut. I'm stumped!


If the HV rectifier circuit shows infinite resistance it may be that the transformer winding has failed on one side. Don't forget you must measure this at a point where the diodes are not in the measurement path. It can still hum in this situation.

I have to say this, be exceedingly careful that the magnetron HV capacitor is discharged, not storing a lethal voltage as it can do.

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hums as in it did not turn on and pump water or hums like it should be running great?

Rod
US Parts Center
888-521-6183

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BEARING NOISE IN FRONT END RT SIDE DODGE SUV DORANGO COULD IT BE CV JOINTS OR BEARING IN FRONT HUMS


Most likely it is the RH front wheel bearings. CV Joints don't usually make any noise until you turn a rather sharp corner. I would advise you to replace the bearings and seals in both front wheels if the bearings are in fact noisy. Jack up the front and spin each wheel, you'll soon hear the sound of rumbling bearings.

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The problem could be the high voltage fuse or the magnatron assembly. replace both to be safe. good luck.

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1 Answer

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When it hums, is it running? Or does it not run when it hums? I'm assuming it runs when you say you have to turn the therm off to get the noise off.. If it's humming and not running, you have big problemo friend..

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