I recently was browsing eBay for a broken pair of Galaxy Buds that I could salvage some pieces from to make some nice wooden Bluetooth speakers. eBay is loaded with these buds, either with one or both not working or an assortment of other issues. So I found a decent pair for like $12 and waited for them to arrive.
The buds showed up a few days later and I charged them and linked up to my phone for some testing. Both buds were charging fully and both linked up to my phone. I played some high frequency tones through each and to my surprise, the left bud that was supposedly broke, was emitting a faint sound. Upon further inspection, the covers over the speakers themselves seem to get clogged with debris.
I pulled the cover plate off with a pin, then cleared everything with some isopropyl alcohol. After a second test, these buds were working as good as new! Upon further research and examining other buds, this seems to be a common occurrence. I can’t say that every pair on eBay being sold as broken will be repairable, but I would be willing to bet that there are quite a few on there that can be.
So, if you’re in the market for some nice earbuds with active noise cancelling, look into purchasing these broken buds on eBay.