Trouble shooting Logic Board

[hansthegerman]

How's it goin guys. I've started playing around with iPhones since last summer and I gotta say, they're a lot of fun. I've fixed my personal iPhone many times and then a buddy of mine came with his iPhone. Apparently he said he had it in his pocked during an absolute down pour, and after that day, it started acting "funny". A few weeks later, it crashed and would not restore. So I took a look at it for him and kept getting the USB data failure issue, whatever code that is. I swapped his logic board into my phone that I know is good and the error kept popping up, so i know its gotta be the logic board. Tried restoring using many different iOS version(2.0.0, 3.1.2, 4.0, 4.2 etc) none of which worked, keeps gettin stuck on "waiting for iphone" and the iphone gets to the screen where it has the apple logo with the status bar but doesn't do anything. Now it doesn't show any indication of water damage so it definitely didn't get soaked. I'm thinking that maybe a solder connecting to something was hot when he had it in his pocket, a little moisture hit it and fractured it. I was hoping to get some trouble shooting help to get this bad boy back up and running(iPhone 3G, 16gb btw) I took a butane soldering iron and using the flame I heated up the solders hoping to melt them around the baseband thinking that maybe the fracture occurred here but that didn't fix anything. I still get the same error. The thing doesn't work to begin with so I'm willing to try things that could possibly break the phone. I don't care enough about this to get a new logic board. Since I got my own and my buddy said i could keep it, I'd rather keep my buddies for parts then actually fixing it if it requires getting a new logic board. Anything I should try/test?