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1996 compact electronic drum kit.

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Whooping sound. Is this repairable?

When powered on, the unit emits high pitched whooping sounds (see video). I opened it up, hoping to see something obvious, but everything seems fine for a 25yo device. It does this both on battery and on Wall plug. Suggestions?

I don't have access to an oscilloscope, just a soldering iron, multimeter and limited understanding.

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Try the multimeter on the speaker cones or output, and see if the voltage output fluctuates.

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Thanks for the reply. I tried it and saw that it indeed fluctuates. My meter is digital, so exactly how much is hard to say, but I saw over 6V values. What does this mean?

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Maybe a damaged amp circuit? It could be thinking there's a signal, and amplifies to max, then resets. Or maybe interference from another device?

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Yes, that sounds about right. there appears to be done sounds, but that gets mangled and only one channel works. Could it be a capacitor or something? Like replace one component and it works again? Is there a way to test components without removing them? There are no visual effects (leaks, discolouration, smells)

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You can add some ferrite beads to the wiring. May not fix it, but it should help prevent interference.

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@okeribok  that does not sound like interference. It sounds like a bad power supply (MOSFET) or bad power amp. We’ll have to see the boards etc. to help you further. Attach some good pictures of your board to your question. iFixitでの質問に画像を追加する方法

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Okeribok さん、ありがとうございました!
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