Hi, I have a Jasper trinity 16mb XBOX 360 s.Dumped the nand successfully. Flipped over tho board and went to solder the yellow wire (point c in diagram) and had a terrible time. The point disappeared on me. It's just a black spot now. I tried cleaning with alcohol and used plenty flux and just can't get any solder to grab the point that was once there. Is there an alternative point I can use?