Logitech UE Megaboom based project - Page 1
Forum section: electronics / projects

author: kkrmkr
author_rank: Newbie
timestamp: May 30, 2023, 06:25:02 am
content: HiElectronics is a field I know a significant amount of basics and I keep learning new things every day. I have a few UE Megabooms, first generation bluetooth speakers that were affected by salt water, corroding the charging boards only. Some, I managed to remedy partially, they would convey the power to the rest of PCBs but won't charge the battery. My idea is to integrate the PCBs in some second hand bookshelf speaker units, wire the amp section in bridge mode and power the system using an adaptor for power tools and appropriate DC-DC converter. Charging the batteries will be done externally, just like you charge a power tool battery. Once I have two of these I can get them to run in party mode and create a decent outdoor stereo speaker system. The challenge I am facing is the unit won't stay on if I just power the speaker using my bench PS. So I still need the original battery to operate it. I would like to operate it without the original battery, or even better without the charging board alltogether. Does anybody here have the experience here to guide me in the right direction? It would be helpful to understand if I am on the right track or not too. I'll post some photos and notes soon to give you an idea where I am in my attempt to figure out how to do thathere is the complete assy, 1 is the charging board where the battery is connected to, 2 is the main board with the amplifier, battery management and charging chip, a microcontroller chip and a ton of mosfets. number 3 is the bluetooth board with the on/off and pairing buttons, the bluetooth audio chip and the memory holding the softwarethe charging board I could only see mosfets or components linked to them, I guessed they were turning on the charging path and maybe converting the 5v to 11v for chargingon the other side of the board same stuff PS DC-DC boosterthe main board has 2 or 3 PS ,I assumed for the amplifier, maybe the battery cahrging (wasn't sure why you'd need a second one when the charging board seems to have one already) a battery charging management chip and a microcontroller. There are a few voltage regulators as well. I am not 100% what the microcontroller's main function was. Is this the one that is likely to monitor the battery presence or through the battery module the information is passed onto the relevant chip (microcontroller?)the last board is the bluetooth board containing the audio bluetooth chip and a memory chip with the software. Could this bluetooth chip operate the on/off commands? It si position very close to the on/off buttonthe battery board, I assumed has only duties to do with ballancing and protecting the battery from overheating or overloading

author: kkrmkr
author_rank: Newbie
timestamp: November 18, 2023, 07:39:09 am
content: Just to let those interested know that I managed to understand a bit of how all this works, or enough to remove the battery board and have it working with an 18V power tool battery without blowing blowing up anything

author: davworks
author_rank: Newbie
timestamp: December 28, 2024, 02:08:57 pm
content: Hi! I know this might be a not of a long shot, but would you mind sharing how you got it to work? Electronics is definitely not one of my strong suits, throwing spanners on the other hand... I have tried to replace the batteries in my two megaboom twice! Both times the supposedly new batteries last a few months at best. I've now given up on that route and was thinking "they would make a great outdoor system, if I could power them from a power supply. Any guidence would be much appreciated!

author: davworks
author_rank: Newbie
timestamp: January 01, 2025, 12:30:22 pm
content: For anyone intrested, 8.2V onto the B+ and B- pads of the battery board gets it going, have been running off a 12v SLA for over 2 days via a LM2596 DC-DC module.

author: Bobbito
author_rank: Newbie
timestamp: September 23, 2025, 07:35:46 am
content: I registered to this website just to reply to this. I have been trying to figure this out for days. I put a wire going from the little pins where the battery attaches too and then hooked that up to a battery. and also so a power supply of the correct voltage. Can you possibly give me some details on what you did to make it work without the battery. I hope this gets to you. I don't want this mega boom to go to waste

author: Bobbito
author_rank: Newbie
timestamp: September 24, 2025, 04:23:25 am
content: Which are the correct ones. There is a bunch of stuff saying gnd. Or batt+. Stuff like that. Can you maybe posta pic?

author: fdgb
author_rank: Newbie
timestamp: September 24, 2025, 05:49:17 am
content: :-Many first-gen Megaboom boards won’t run stably without a handshake from the original battery management IC. Even if you supply the right voltage, the microcontroller is looking for a status signal from that chip. One workaround I’ve seen is to leave the battery management board in the loop, but replace the cells themselves with an external DC supply. That way the system still “thinks” it has the battery attached.

author: Bobbito
author_rank: Newbie
timestamp: September 30, 2025, 08:05:08 am
content: Dang that is literally the one piece that I don't have. That sucks.