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Electronics => Repair => Topic started by: selfrepaircare on July 31, 2019, 03:23:35 am

Title: Help Fixing whining Noise from drivers in speaker
Post by: selfrepaircare on July 31, 2019, 03:23:35 am

I got a hold of these bluetooth speakers but when powered on, there's a constant high pitched noise. I tried digging online for a fix and what I did find was info on ground loops but I don't have the speaker plugged in (it has a battery) and I don't see anything out of the norm on the inside.

Besides the whining these are decent speakers that I'd hate to throw out. I did some trial and error to narrow down what's causing the whining by unplugging the internal connectors of the battery, DC connector, and the speakers, while flipping it on when each was unplugged and I believe that its definitely being caused by the drivers.

Does anyone know what the problem could be or a potential solution?

Here are some pictures of the internals:
(https://i.imgur.com/I2lLhGC.jpg)

(https://i.imgur.com/k1HTHRM.jpg)

(https://i.imgur.com/RJNjFZh.jpg)

(https://i.imgur.com/8R49oAy.jpg)

Title: Re: Help Fixing whining Noise from drivers in speaker
Post by: oPossum on July 31, 2019, 03:34:38 am

Could be a cheap filterless class D amp chip. Hissing is somewhat normal for them.