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Wow thanks for that, I think you've nailed it. It's definitely on the power rail as the caps next to it have 24v across them and then it drops to 5v on the other side.

Wondering if anyone can identify this chip on my Powerbook G4 Titanium. I have a feeling it's failed as it's getting super hot as soon as I plug-in the power chord and the machine won't boot.

I followed your advice and tried my flux pen and dragging the iron across the pins. It was definitely much easier and quicker than the solder paste and heat gun I had been using. 

I just got both of them working. ;D I must have removed and re-soldered the SoC 5 times on each board and I still kept getting the same error. In total frustration I took one of the boards to the kitchen sink and gave it a good scrub with soapy water and a toothbrush. You would scarcely...

Thankyou that is a huge help. I'm going to go back and very carefully redo the SoC pins.  Ive been looking for the problem on the software/firmware side. The problem occurred in both boards that I made and my thinking was that it would be difficult to repeat the same problem twice on both...

I recently decided to try and make my own scsi2sd v4.2 from the project shared on github. I've managed to build 2 boards and flash a hex file to the cypress chip and then upgrade the firmware. It's at this stage I've come unstuck. I have not been able to get the board to work on a compact mac...