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What component did I break?


kanaaudio
(@kanaaudio)
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Hi guys 🙂

I made a quick "boombox" for my wife when this hole covid19 issue hit Denmark back in march, and the country went into lock-down, so she could continue her work-outs from home.

I made it from the C-note kit from partsexpress and essentially, its just the two bookshelf speakers stuck together with a bluetooth board and battery inside.

I has worked wonders up until now, and I am hoping you would have a qualified guess as to what is broken.

I get, what I fell like is, full power from one side. The driver moves and vibrates as normal. From the other side I get only about 10 % power. I still feel the vibrations, but they are very small. Whereas I can see the good driver move as normal, I can't really see any movement in the other. Almost no sound is produced by the bad one.

So - I just figured I'd hear what your thoughts where, before I end up taking everything apart 🙂

How to I best troubleshoot? Is it most likely the crossover, driver or even the card? I guess I can rule out the components inside if I unsolder the driver and put that crossover on the good driver in stead?


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TVOR-Ceasar
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In general, the Troubleshooting, in this instance, would be to:

1. Switch the left / right speaker leads to see if the problem follows the wires. If the problem moves, it is before the speakers.

2. Test the inputs with a known, good, amplifier. If both sides work, then it is a problem with the on-board amp.

3. At this point, you have to decide how advanced your skills are in order to further troubleshoot. If you are not confident or not knowledgeable enough to do component level repair, then replace the amp with a similar rated unit. Otherwise, dive into the fun world of electronic repair.

 

Who knows, you may dig into the wiring and find something worked loose (best case scenario). Or, you may have to replace 1 or 2 components.

Remember, it is always a good thing to have enough "known good" parts lying around in order to verify other unknown parts. It helps make the initial diagnosis a fast process.

-Charlie
https://www.youtube.com/user/TheTrueVoiceOfReason


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kanaaudio
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@tvor-ceasar
Thanks for that guide. I was hoping for an answer in the lines of “oh, that’s clearly because of ... “ :-D. 
But I guess only very few things ever work out that way. 
Anyway, this gives me some structure to start from. I wouldn’t be able to troubleshoot the crossovers or the amp board, so let’s hope it’s one of the first two. I guess I could always switch the side connections on the crossover as well, same as for the drivers. That would give tell me if some of the crossover components are done, but I wouldn’t be able to figure out which. 

Anyway, I’ll dive into it, thanks ceasar 


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TVOR-Ceasar
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@kanaaudio

Anytime. 👍 😀 Let us know what you find when you start getting into it. There's always a chance that someone else may have an idea that may fix it, or at least be more definitive.

-Charlie
https://www.youtube.com/user/TheTrueVoiceOfReason


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123Toid
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@kanaaudio

Just to clarify, you have one stereo amplifier?  And you hooked up each "speaker" to either side of the amplifier?  If that is the case, it sounds like an amplifier issue or bad connection.  Definitely do what @tvor-ceasar said first and then report back. 

https://www.youtube.com/123toid


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kanaaudio
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@123toid
Yes I used one DA KAB-250v3 and connected the outputs to each of the crossover units that came with the kit.


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123Toid
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@kanaaudio

definitely switch the wires around.  Like @tvor-caesar said it'll let us know where the issue may lie, then we can help point you in the right direction from there. 

https://www.youtube.com/123toid


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kanaaudio
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@123toid

Ok, will do - thanks


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kanaaudio
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@123toid @tvor-ceasar

I finally had some time to work on this issue. It turned out to be pretty simple to solve actually. The problem was caused by the volume control. The mounting nut hadn’t been fastened tight enough from the beginning I think, so it was possible to overturn the volume knob. So when the mechanics of the volume control knob was at its max, you would be able to continue turning the knob, but really you were turning the volume control board inside the enclosure instead. Causing some of the wires to loosen.

Once I reattached those wires properly, everything was back to normal. 


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TVOR-Ceasar
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Posted by: @kanaaudio

@123toid @tvor-ceasar

I finally had some time to work on this issue. It turned out to be pretty simple to solve actually. The problem was caused by the volume control. The mounting nut hadn’t been fastened tight enough from the beginning I think, so it was possible to overturn the volume knob. So when the mechanics of the volume control knob was at its max, you would be able to continue turning the knob, but really you were turning the volume control board inside the enclosure instead. Causing some of the wires to loosen.

Once I reattached those wires properly, everything was back to normal. 

 

Posted by: @tvor-ceasar

...Who knows, you may dig into the wiring and find something worked loose (best case scenario)...

See? You are a born troubleshooter and you didn't even know it!
That's really good news and I'm happy to know you fixed it. Must be a +1 in the wife's scorebook. 🙂

-Charlie
https://www.youtube.com/user/TheTrueVoiceOfReason


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kanaaudio
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@tvor-ceasar

haha it’s funny you reposted that, I was thinking about writing some joke about best case scenarios like ceasor said, but I lost confidence in my English vocabulary and phrases so I dropped it. 
But thanks for the guidance, it will definitely come in handly - next time it might not be so obvious. 

And yes, it’s definitely a +1 since our government just issued a second lockdown due to covid, and all gyms are closed once again, starting tomorrow. She’s back at it in the garage. Couldn’t have come at a better time 🙂


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TVOR-Ceasar
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You are absolutely welcome for the help (even though it was your own eagle eye that found it) and always willing to do so. My hope is to give people the confidence to narrow down a problem, any problem, in as efficient a way as possible, and to be excited to be fixing something. I want others to be curious as to how things work, rather than just be an "end user." That's how I see DIY. 

I think your vocabulary is quite good. Go ahead and "let it fly". You'll only gain confidence by doing. I wish I was as fluent in other languages than my own.

Hopefully the lockdown won't be too long. At least you'll be cranking the music until you can get back out. 

 

-Charlie
https://www.youtube.com/user/TheTrueVoiceOfReason


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kanaaudio
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@tvor-ceasar

Thanks, I’m glad you think so. A country this small needs the means to communicate with the rest of the world and since danish is only spoken by around 6 million people, English is mandatory throughout most of the years of school. 
Plus of course, the internet, movies, about every instruction manual, etc. doesn’t hurt either. 
Have you ever seen a Danish movie? We have a lot of them, and they are good I think, but I don’t think they roam the world like American movies do 😉 


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TVOR-Ceasar
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I've seen quite a few films from many different countries, but I can't definitively say any have been Danish. I'll say my answer is: maybe. 😀

-Charlie
https://www.youtube.com/user/TheTrueVoiceOfReason


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