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Protronics Portable Bluetooth Speakers Repaired

By on February 22, 2021
Protronics Portable Bluetooth Speakers Repaired









Received Bluetooth speaker for repair stating problem sound quality is not as good as earlier and making some vibrating Noise when sound level is high.

bluetooth speaker repair

For testing I have turned on the speaker and found low sound with distorted vibration noise. For further diagnosis I opened the unit.

 For opening you have to pull up the metal meshing using some strong pointed needle type pry tool by corner of the upper frame. After removing the mesh you can find location of the screw.

bluetooth speaker repairing

Be very careful for opening procedure because you never know how things fitted inside.

how to fix bluetooth speaker

After opening I started visual inspection here what I found. Red wire of left side speaker is found desoldered. So I have soldered it back to its place.

how to repair bluetooth speaker

I think this is the cause for the problem but for further diagnosis I did not powered the unit because when we open the unit we have to finish some maintenance work also. Therefore I removed the main PCB & Control PCB for inspection and cleaning.

Visual inspection I did not found any more physical damage on the PCB so I cleaned the PCB with the IPA.

cleaning circuit board with IPA

 Now time for the control PCB ……as control PCB is having switches so cleaning is necessary.

how to repair and fix bluetooth speaker

Cleaned the PCB with IPA. One more thing I found that speakers are not having proper screw system for fitting and it was fixed with hot glue which was out. (Though Build quality of the Unit is very good). This may cause for vibration on high volume.

how to fix a broken bluetooth speaker

Applied fresh Hot Glue on corner of speaker metal part to Plastic Frame. Be careful while applying glue if it go inside the paper cone of the speaker you will spoile the speaker & Do Not use any epoxy or superglue or when you need to remove the speaker for any reason may speaker or plastic frame get break.

fixing bluetooth speaker

After these all process I have reassemble the unit for testing. Powered the unit and played the song. And it sound loud without any vibration noise.

Vibration noise is because of speakers are not fitted properly & Low loudness is because of one speaker is not working wire got disconnected from the PCB.

This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.

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Note: You can check his previous repair articles in the link below:




  1. Albert van Bemmelen

    February 22, 2021 at 1:31 pm

    Quick and decent repair! I guess that it maybe also would be a good idea if also the wires were glued to their positions with hot melt glue. Because the heavy vibrations of those speakers probably could cause this problem again. And the fact that portable devices once in a while tend to fall or are dropped undeliberately too.

  2. Yogesh Panchal

    February 22, 2021 at 7:09 pm

    I did it at the time of final assembling but forgot to take photo.

  3. Parasuraman S

    February 22, 2021 at 10:16 pm

    Well done! Good Job! I too have done a repair of similar set, which was published here long back! Glad to see another one!

  4. Yogesh Panchal

    February 23, 2021 at 1:53 pm

    Thank you! Sir


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