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I wanted to know what kind of external power supply it needed. I open the case and saw 4 diodes which tells me is a bridge rectifier circuit. I also looked at the filter cap and saw ????uF at 28 volts. Therefor, I did the Scientific Wild *** Guess( A.K.A. SWAG METHOD) 12 volts AC out at 1.6 amps or higher.
if your speakers have a warranty can you return that to the store with the receipt because the store will replace a new for defective product..or you can go to the web site of the brand of your speaker if you intent to buy the main board you can order trough the online shopping.
Based on your post/description, the Durabrand 2.0 CH USB Speaker System is a basic external speaker that plugs into your PC's speaker/headset output (green jack). It is supposed to get its power from the +5VDC supplied by the USB port. Some USB port have current limiting therefore it can be anywhere from 10 - 500 mA. The power requirement of your external Durabrand speaker maybe beyond what the PC's USB ports can supply. It does not need to be recognized by the OS since it only connects to the USB to get power but there is no data interaction.
Perhaps what you can do is get an external +5VDC power supply whose output is in USB type connector. The current rating would depend on the requirement of your speaker. Offhand, if the speakers are not that big, probably a 1 Amp would do.
This is of course assuming that the Durabrand speaker system is fully functional. If with an external power supply it is still a no go and you have verified that sound do come out of your green jack (with the use of an ordinary headset), then the Durabrand is defective.
Hope this be of help/idea. Post back how things turn up or should you need further information.
Good luck and kind regards.