Here are scans of the Wireless Networking Adapter Board.TOPTOP w/RF Shield Cover RemovedBOTTOM
I have a couple of these I'm working on now that have issues. Though I hate to say it, when these things die it seems they're pretty much gone as I've yet to find anything really easy that's going bad on them, it seems to be the main controller IC that's going bad, though I still haven't looked that much into them yet. There is a fuse in there, marked with 'J' and it's a 1-1/4A (1.25A) SMT, but even on an adapter that's completely dead it could still be good and not the cause of it. Makes it a real shame these things cost what they do and when they go belly up don't even have something repairable inside, shame on you M$.
One interesting thing is there is no SIC (Security IC) in these things like on every other 360 peripheral, so that's either being handled by the main controller IC there or there's some other reason that other wireless USB adapters don't work, again shame on M$ for being so greedy with this thing when it's really no different than a Wireless USB adapter ya can get at a lot of places that costs half or less and does the exact same thing, but since every peripheral is made by or has to have their approval they get to really bend ya over if ya want to get rid of the CAT5 to game online.
Thanks to XM202RonFez for sending the Adapters to be used.