Then, i took the working motherboard and i started to solder the RAM chips in one of the free "socket" on the motherboard. Unfortunately, cause my distraction, during this process I've broken one pin of the chip. So i resigned to forgot the memory update and, taken again the solder wick, i desoldered the few pins that i've soldered before.
All of this went ok, so I put the motherboard back in the case, connected al the cables and turn on the console. No problem, indeed.
But, after i think 1-2 minutes, maybe more, some intermittent artifacts appeared on the screen and they made the xbox frozen.
So i rebooted it and the artifacts comes up during the flubber. I rebooted again and the xbox froze with intermittent artifacts directly on the "ind bios loading" screen.
For some period the xbox had the FRAO, but as soon as i checked with the multimeter the fifth LPC point voltage (that initially was 0.2, and then it came back to normal to 3.2v) the xbox again show artifact on the ind bios loading screen and froze.
What could be happened? Could be one of the original RAM chip broken? maybe the one under the socket where i tried to solder the chip. There is a way to understand if one or more ram chips are fried? (even if i don't understand how it could be possible)
I've checked for broken trace, shorts etc. around the place were i tried to solder the chip, but nothing.
Edited by Difio, 17 October 2011 - 11:00 PM.