360's rrod, what a nightmare, i have repaired around 10, and so far, about 3 are still working, i have always removed the xclamp on the gpu not cpu, as afai understand it, the gpu is getting to hot and the ball grid becomes cracked because of no help from lead free solder, so more pressure other than xclamp. seems like xclamp warps the board around the gpu and hairline cracks result in failed contact in the grid. so i use different methods trying to see if any fix is good, including drilling holes for 5mm bolts, and using standoffs, usually 4 x 1mm washers on each bolt, then tighten up real good. then power up and see if rrod is gone, if not, then i use tea towel method around gpu, leaving fan connected and duct in place, cpu this way does not overheat and gpu gets so hot it burns fingers at a touch, let to cool down, then retry, and for sure, rrod is gone, but, thats not the end of it, i would have more chance backing a 3 legged horse to win a race at the grand national than the rrod not coming back. and come back it does, so where now. shim? 1mm shim, tighten down gpu heatsink again with 1mm alloy shim neatly in place and arctic 5 in place, overheat again with tea towel around gpu heatsink, let cool, power on, and rrod gone, but the bitch of rrod comes back
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bang head against wall and give up, nah, go buy some nylon kit off some freak on ebay who claims no expanding coz they are nylon not metal blah blah, fitted this nylon bolt/washer kit and rrod is still present, out with the tea towel to overheat the gpu heatsink once again, let cool down, power up and bingo, rrod gone, in addition, fitted xcm power fan, the one that goes just below the cpu, see if a combination of the nylon fixtures and the xcm fan resolves the trouble, nah, the guy back on the phone even earlier than i thought, 1 day later with rrod back, so, a lot of time i have spent with these dam 360's, and i am really close to knocking it all on the head
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, anyway, good luck fellow 360 fixers, im sure i can find something better to do with my time.
H Man