Converting from 240v to 117v
Eh, you might.  Can you take the board out and post a picture of the back?  Generally those sort of line voltage selection jumpers change the transformer tap configration.  However, it looks like that they may have cheaped out on this one as there are unconnected pins on the header going to the transformer.  Looks like there should be a yellow and an orange wire there that are not present.  Not surprising as it's made in china - a transformer with no taps will be a little bit cheaper than one with taps.  

Alternately, if you can't take the board out, can you unplug the transformer and line voltage selector and use a multimeter to figure out which line voltage select pins are connected to the transformer header?  If the 117 volt pin is connected to one of the unconnected pins going to the transformer (which I suspect) then you're going to have to swap out the transformer, unfortunately.