miniDSP 2x4 KIT PSU problems - diyAudio
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Old 12th March 2015, 09:53 AM   #1
PeterRP is offline PeterRP  Denmark
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Default miniDSP 2x4 KIT PSU problems

Trying my luck in here for the first time...
I have a miniDSP 2x4 where I have been so unfortunate to reverse the polarity of the 15V PSU. A snap was heard and a little "magic smoke" emitted.
I can't get ANY directions from miniDSP support as to where I need to do control measuments, to try to locate the problem, and therefor I would like to hear from any members of DIY-Audio if you have ANYTHING for me to go on.
miniDSP says I can send the PCB to them for repair, but the cost of sending it to and back from Hong Kong, by far exceeds the cost of a new DSP.
Hoping for help!
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Old 12th March 2015, 10:29 AM   #2
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The first thing I would be looking for is bulging/splitting electrolytic capacitors... They will go bang (and let out smoke) if polarity reversed. If you are lucky that will be all it was.

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Old 12th March 2015, 10:45 AM   #3
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Can you please upload a high definition picture of the PCB ? A schematic might be even better in order to help you out

Best regards,

Edit: Ive found a picture of the product. Well, the big capacitor next to the power supply socket might be destroyed by now and maybe also the miniature regulator and the DAC chip itself.

This PCB looks like fun, only small SMD components to check

Quote:
Originally Posted by PeterRP View Post
Trying my luck in here for the first time...
I have a miniDSP 2x4 where I have been so unfortunate to reverse the polarity of the 15V PSU. A snap was heard and a little "magic smoke" emitted.
I can't get ANY directions from miniDSP support as to where I need to do control measuments, to try to locate the problem, and therefor I would like to hear from any members of DIY-Audio if you have ANYTHING for me to go on.
miniDSP says I can send the PCB to them for repair, but the cost of sending it to and back from Hong Kong, by far exceeds the cost of a new DSP.
Hoping for help!

Last edited by Gorgomat; 12th March 2015 at 11:11 AM.
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Old 12th March 2015, 12:14 PM   #4
PeterRP is offline PeterRP  Denmark
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Join Date: Oct 2014
Location: Kolding, Denmark, Europe
miniDSP will not release any schematics, or give me indications of where to do measurements.
I will try to change the capacitor and test the regulator...
Thanks for the reply!
Others who might have any ideas..?
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