Hat geantwortet auf: My JBL Flip 4 doesn't turn on and charge.I had the same problem! So yesterday I divided to take it apart and I actully got it to work agian! What you want to redo is take off all of the outside casing and expose the raw wiring of the on button. Once exsposed take off the rubber protected and you’ll find a rectangular ciurxit board connected to a flat blue wire. Unlatch the wire and put it back in and the lights should flash. I will say that it will likely not be water proof so take it with a grain of salt. Let me know if that works.