Yesterday I was working on an Falcon chipset Xbox 360 and it had the red rings of death. The error code that I read out was 0110 which is a cold or bridged solder point on one of the RAM chips (according to this: http://rrodcure.blogspot.com/2008/05/faq-x...lained-if.html). The only ways I know to fix this is to attempt a reflow of the existing solder or to reball the chip itself. I didn't want to go through the trouble of reballing the chip so I attempted a reflow. I used a heatgun to get each chip hot enough to reflow and still had no luck. Same red rings with 0110 each time. I decided that maybe adding a slight downward force on each chip as it heated up may reconnect a broken solder joint and fix it (unless it was bridged joints). When doing the first chip, the motherboard shifted on my table when adding just the slightest downward force to the chip, causing the whole chip to lift off the board. I've already gone ahead and retinned the pads on the board and chip.
My main question is, where can I find pre-made balls of solder that are the right size for the RAM chips? And also, has anyone else reballed these chips before? I do have a good amount of experience with small electronics and soldering, but am still hesitant and would like to not ruin this Xbox 360. Thanks in advance to anyone that can help me!
EDIT: Also, I've noticed some Xbox 360's don't even have the ram chips on the underside of the board. Would I be able to just remove the 4 on the underside and have it still function?