The JBL Charge 5 power bank speaker, top view, showing the -Power- button when the speaker is OFF.
When you notice the JBL Charge 5 not turning ON, one or more causes may be to blame…
So, assuming that all the hardware and software in the 5 is working, we cover the last possibility. That is, how to exit service mode, and to get the 5 turning ON again.
First, a symptom of running service mode, is the JBL Charge 5 not turning ON without the charger. Thus, it will not run on the battery while in Service mode.
Moreover, when you do connect outside power, it powers ON right away. And it does so without you pressing the Power button.
Also, you cannot turn off the unit while in Service mode. Well, that it unless you disconnect the power source first. And then, it turns off without pressing the Power button. Thus when this service mode is active, the Power button has no effect.
Finally, none of the buttons seem to work in Service mode, except for the ones that exit this mode. Thus the Charge 5 won’t pair with any devices when you press the Pairing button. Furthermore as stated earlier, the Power button does not switch it OFF either.
This is what someone may have done by accident prior to your JBL Charge 5 not turning ON. So to activate this Service mode, power up the speaker. Then press the Connect+ and Volume UP buttons at the same time. Hold them in until the Charge 5 powers OFF. So this usually takes ten seconds or so.
Note that you can enter this mode as long as the 5 is ON. So it doesn’t matter whether you connect external power or not.
But remember that once in this mode, you can’t exit it without first connecting the charger.
Now you can restore normal operation by ending Service mode. But note that when this mode is active, then to switch it back off, you must connect external power again. Why? Because when this mode is working, the 5 won’t power up without outside power. But you can’t change modes without switching on the unit first. Thus, you need the AC adapter to make this fix.
Finally, at this point, the Power button should work again whenever you turn the 5 ON.
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