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To open these you need to pull the front grille off. There are four screws, one in each corner. You'll need to do a bit of prying to get it open as the case is sealed around the edges, but it isn't too terribly difficult. Just take your time.
On the back of one of the speakers, there will be 3 plugs; a green one, a grey one, and a black one. The black one is the power plug. Right below the power plug it says the voltage needed (I could only find one picture online, and it looks like it says 15v, which would be 15 volts). That number is the needed supply voltage, so search google for (number under plug) volt power adapter.
If you can get the speakers open, check for blown capacitors or puffy capacitors. If you see any they will need to be replaced with capacitors with the same UF rating and at least the same voltage and make sure you line up the striped line with the striped line of the motherboard. You'll need to be able to undsolder and solder the caps off and on.
If you see big black marks on the board then the board is basically usueless cause it would cost more to fix then the cost of the board itself. Also check for any blown fuses and if there is you would need to replace them with the same rating.
I know this is a little late, but the power supply that these speakers use appears to be 5mm across. The output specifications are 15V DC, 1000mAh (1A), with the center pin being negative.
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