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M-Audio Bx5 repair

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M-Audio Bx5 repair

Postby Hewston601 » Mon Feb 11, 2019 8:36 am

Not sure if this is the right place to post but am in desperate need of help.

Had a house party a couple days ago using my pair of M-audio bx5’s linked to a behringer mixer and my laptop. Someone turned the mixer channel volume to full and the left speaker just stopped working.

The speaker’s front blue light doesn’t turn on when provided with power so it must be a power issue. I opened up the back of the speaker as I’d heard leaking electrolyte for the capacitors could be a problem but couldn’t see anything like it.

Anyone with any ideas to help I would greatly appreciate.

Here’s links to pictures I’ve taken:
https://ibb.co/0GGSqfV
https://ibb.co/48zhHgt
https://ibb.co/xG0b3yT
https://ibb.co/JB8btdP
https://ibb.co/tQ7c6Jh
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Re: M-Audio Bx5 repair

Postby Hugh Robjohns » Mon Feb 11, 2019 10:34 am

Have you checked the mains fuses in the mains plug (if in the UK) and the unit itself (under the IEC inlet)?
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Re: M-Audio Bx5 repair

Postby Hewston601 » Mon Feb 11, 2019 5:14 pm

Hugh Robjohns wrote:Have you checked the mains fuses in the mains plug (if in the UK) and the unit itself (under the IEC inlet)?

Hi Hugh,

Thanks for the reply, I’ve checked the plug fuse and that’s working correctly but can’t seem to find/access the fuse in the speakers due to how it’s built, would you know of a way to access the speakers fuse?

Many thanks
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Re: M-Audio Bx5 repair

Postby Hewston601 » Mon Feb 11, 2019 5:27 pm

Ignore my last reply I just found and replaced the fuse in the speaker and it still will not turn on.

Would hugely appreciate any more suggestions
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Re: M-Audio Bx5 repair

Postby Hugh Robjohns » Mon Feb 11, 2019 6:16 pm

Tiz properly broken then!

I agree that, given the lack of little blue light, the most likely failure is somewhere in the power supply -- although a destroyed PSU could very easily have taken out the rest of the input and power amp stages with it.

Fault-finding will require electronics experience and appropriate test gear/tools to check through the power supply and then the amp sections -- and will also require working on it when it's powered which is inherently a dangerous activity and not one I can recommend online, especially for the novice, I'm afraid.

Your best bet is to find a qualified electronics technician experienced with amplifier repairs. It looks like a linear power supply which makes potential repairs a lot easier than a switched-mode design, but it also looks like it uses chip-amps which can be quite delicate. So repairs could easily end up costing more than a new replacement BX5...

Sadly, house parties and small nearfield monitors don't usually go well together. :cry:

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Re: M-Audio Bx5 repair

Postby Rich Hanson » Mon Feb 11, 2019 7:02 pm

The power supply capacitors can fail with little or no external indication, this happened to both my BX5a monitors within the space of a month. I replaced them and they've been fine ever since (must have been getting on for 10 years since I did that).

They're the big ones in the second photograph, in case you weren't already aware. I can't speak for the BX5 as I have the 5a, but it was recommended to me to replace them with the same capacitance but with a higher rated voltage.

It's certainly worth trying to see if it fixes your problem, as the capacitors aren't that expensive.
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Re: M-Audio Bx5 repair

Postby Hewston601 » Wed Feb 13, 2019 12:09 pm

Thank you very much for your replies,

I'll take them to my local sound/electronics technician and have them take a look, it's easy enough to find replacement amplifies online that I'm considering buying after a quick inspection. Will update with news.

Thank you
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