With this Instructable, I will show you how to repair a Phillips BT2500, or any other Bluetooth speaker.
Mine wasn't working any-more because the micro USB de-soldered itself from the main board.
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Step 1: Take Appart the Bluetooth Speaker
First thing, you need to remove all the screws from the speaker.
You can then unplug all the components:
- Main board (Amp + Bluetooth interface)
You need to identify the problem at this moment.
Step 2: Gather Replacement Parts
Instead of soldering a new Micro USB to the board, I decided to pump it a bit, and change it's form factor.
I took a battery I got from an old asus tablet pc. I bought a micro USB 5V 1A battery charger ( https://www.amazon.fr/XCSOURCE-chargeur-batterie-... ).
I also got a power switch from and old ATX psu.
Finally I used a old philips radio that my dad use to have when he was young!
I used it's original speaker and potentiometer.
The bluetooth speaker was 8 Ohms and 3 Watts and I replaced it with a larger 8Ω 2W speaker.
The battery is also 3000 mA/h, way bigger than the previous 750 mA/h one.
Step 3: Put Everything Back Together
Now, you just need to adjust the old radio. I cut some slots for the micro usb and switch with my dremel.
Soldered everything and testing it along the way.
It's now over you have a brand new "retro" looking bluetooth speaker!