If your JBL Flip 4 speaker refuses to turn on, see the JBL Flip 4 Won’t Turn On problem page for possible causes and solutions. If your JBL Flip 4 speaker will not charge or won’t hold a charge, see the JBL Flip 4 Will Not Charge Or Won’t Hold a Charge problem page for possible causes and solutions. Connect to the charger and once you see light on remove charger, press connect + button and volume up together until it turns off, it solved mine, the same problem.