1PCS For JBL Flip 4 Bluetooth Speaker Motherboard E322002 CX-0812W - AliExpress
So, I have this old JBL Flip 2, it didn't turn on, that was an easy fix, however, it stopped producing audio, I hooked up the speakers directly to my headphone jack
ORIGINAL JBL Flip 4 Parts Main Board/Speaker/Battery/Charging AUX Port Etc | eBay