When the Power button on your JBL Boombox 2 speaker is not working, this likely means one or more things.
Either…
So, assuming that the speaker is okay, we discuss here the last possibility. That is, how to get your JBL Boombox 2 out of service mode.
First, when in this (often called ‘weird’ or ‘secret’) mode, the speaker can power ON. This speaker does indeed run on the internal battery while in Service mode. Furthermore, the Power button does not turn it off. So without exiting this mode, it will not turn off until the battery runs dead. So when Service mode is in effect, the Power button does not work.
Finally, none of the buttons have any effect in Service mode, except for the ones needed to exit this mode. E.g. The speaker won’t pair with any devices. And as mentioned, the Power button does not switch it off either.
This is what you may have done by accident. To turn on this Service mode, power up the speaker first. And then press the Bluetooth and Play-Pause buttons at the same time. Hold them in until the speaker powers OFF. This which usually takes ten seconds or so. This mode is now active.
Find these buttons pointed out in the next picture. Note that you can enter this mode as long as the speaker is ON. It doesn’t matter whether external power is present or not.
Now you can restore proper operation by disabling this mode. Note that as long as there’s enough battery energy, you won’t need the adapter to switch off Service mode. But you can connect the adapter if you wish.
Finally, at this point, the Power button should work again, whether or not you connect the AC adapter.
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