Check the south bridge as well... That's something else I had just thought could be the problem.

my experience with 0023 is the cpu chip is overheating, if you've done the x-clamp mod and tried everything
and nothing works, then do this:

on the cpu side only return it to stock with the original x-clamp.... for some reason with the x-clamp mod
the heatsink is not sitting on the cpu and is overheating....

replacing the original x-clamp on the cpu side only almost always fixes this error for me.

Actually if the chip overheats at all it just shuts off the cores and gives the normal 2RoL... You can literally just take the heatsinks off and start the console to show this, it will shut down the cores in seconds. 0023 has nothing to do with the heatsinks sitting on the cores.

hey guys,

bit of an odd one here, I've got one that doesn't boot up. you hit the power and the center light flashes but never goes solid, and the ring of light never does its little loop (no video or audio out either). sometimes it will RRoD but only after running for a minute, it alternates between 0022 and 0103. I got it apart now and the X Clamp replacement has been done but the holes haven't been drilled in the solid metal part of the case, the replacement screws were way too tight so I loosened them off and now it won't RRoD but it still won't boot up. any guesses?

Can this be posted here?
http://www.x360forums.com

I had the RROD (three red LEDs) a couple of days ago, and after a few attempts to reboot without results, I took a look at the secondary error code, which turned out to be 0020. I then took the thing apart and applied llamma's X-clamp replacement and decided to add thermal paste, since M$ apparently hadn't when the console was assembled.
Now, when I turn it on, it boots to the dash without problems, but the front panel led's don't work, nor does any wireless controller connect, and the CPU gets real hot real fast, causing the fans to go into overdrive.

I guess this could be a possible short between the CPU and the front panel?

Update to my previous post:
I found the problem: while removing the X-Clamps, I accidentally hit one of the resistors near the front panel connector and ripped it partly off the circuit board.
Would it theoretically be possible to replace it, or just bridge the connections to get it back to work?

I apologise for not editing my previous post, but I couldn't find the edit button anywhere near it.