Toshiba 37av502u hum noise

As goofy as this might seem, a large accumulation of dust inside the TV chassis could be the culprit. The dust becomes conductive and drains the charge from the capacitor that keeps the memory "alive" while the set is powered off. I'm a 40+ year veteran TV technician, but I've specialized almost exclusively in antique (1940's to 1970's) all vacuum tube sets for the past 15 years. I can get a dead 1946 RCA 630TS 10" B/W TV (worth about $2,500 as an antique) working again with about 10 hours of bench time. My new roommate, a lady I've known since we were kids, brought a Toshiba 37AV502U with the same "loses its memory" symptom when she started renting my spare bedroom recently. I opened it up looking for a bulging electrolytic capacitor or a dead RTC battery like some computer motherboards. I didn't find any suspicious capacitors and the only batteries this set uses are the AAA cells in the remote. What I did find was A LOT of dust inside the set. Cleaned the dust out, put it back together, and the set is holding its memory now when powered off. Obviously, the dust was creating a shunt path that was bleeding the charge away from the capacitor that stores charge for the memory.

have some to check it for you you might have a power supply problem

Ur power supply board.Transformers have have high voltage gap.This problems must take the tv aparts put some glue arond the transformers,sometime solved this problems,or must replaced all the trnsformers make the humming noise.Brand new tv take it back,where u bought it get a replacement or call the Manufacture help to fix the problems or replaced the part that cause the problem.

Redo it again lost power to tv,sometime loss Data save.Data dossn't dissapper only lost.

It's likely your color wheel rather then your fan. I've replaced quite a few of these and the fans are usually good. Get and estimate - I generally charge $250-350 Total
also google your model # and color wheel to investigate further.

return tv to retailer ?.

Sounds like a fan getting cought on some dust inside you might want to have this serviced if you do not know how to clean it.

The humming would be a fan the buzzing would be the fan getting stuck!!



Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edwy_1a56970cf1ea4620

This does sound like a color wheel. To my knowlege, Toshiba does not sell the Color Wheel seporately. In short, you have to replace the Opical Block. The cost of this is very exspensive and Toshiba may not sell it to you. You may have to go through a Toshiba Service facility to obtain it. Check prices of new LCD sets before investing the money.
Hope this helps,
Skyassoc

Thank you for the info. I would suggest to take it back from where you bought it from if the store will allow a 90 days return and replace it for a new one, or you can contact Toshiba to get it fixed under warranty. There should not be any humming noise on the speakers.

Mine does the same thing!!