Why is my jbl boombox not charging or powering on?

I did a complete disassembly of my JBL boombox one. I completely removed the battery from its compartment and tested it on a multimeter it showed 7.3 DC volts. Next with the battery still unplugged from the unit I plugged a 20v 4.5 amp aftermarket charger to the outside port I tested the inside PCB plug to the motherboard and it showed 19.5 volts. I have checked for a continuity and all the circuits none are showing bad. It is still a brick pick a number if anybody has any ideas or pointers please I could use that. You conclusion at this point I would say it's either something bad on the motherboard or a software issue / firmware that I cannot update because it will not power on.

Mar 17, 2024 by Randall J Hole

@randalljhole what voltage do you get on the battery connector when you plug the charger in?

Mar 17, 2024 by oldturkey03

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1 Answer

Hi @tim60682,

have you checked that there's 19V DC on the output plug of the power adapter?

Have you tried a different, compatible, known working adapter to see if the speaker charged/turned on OK?

What have you tried? — jayeff
I did a complete disassembly of my JBL boombox one. I completely removed the battery from its compartment and tested it on a multimeter it showed 7.3 DC volts. Next with the battery still unplugged from the unit I plugged a 20v 4.5 amp aftermarket charger to the outside port I tested the inside PCB plug to the motherboard and it showed 19.5 volts. I have checked for a continuity and all the circuits none are showing bad. It is still a brick pick a number if anybody has any ideas or pointers please I could use that. You conclusion at this point I would say it's either something bad on the motherboard or a software issue / firmware that I cannot update because it will not power on. — Randall J Hole
@randalljhole what voltage do you get on the battery connector when you plug the charger in? — oldturkey03