All done!
I can haz pr0n tiem naw?
One of the offending chips:
Off it comes, and the pads get cleaned and fluxed ready for the socket. :smile:
Socket soldered into place:
Repeat three more times, and the shiny new chips that Hikey programmed for me can be inserted.

As mentioned, I tested the card between replacing chips so that if there was a problem with the card booting, I would know that the last piece of work would be the most likely cause. There were no problems at all :smile:
The card, as modeled by Taj's motherboard :smile: (it's on my worktop being given some love in the other thread).
So, like before, I'll do some tests with various CPU-intensive software, and see if I can get any more freezing. I'm convinced it's solved now though, as my machine has now been running for quite some time with your card in place. Before, it would hard-lock within minutes without cold air being blown on it, and not even a power-cycle could bring it back without letting it cool down.
Now, all seems great!

:drinkin:
If all goes well, she could well be back home with you early next week, Steve!
I think I have a few little fans that could be placed on the 040, but they'll have the PC motherboard-style 3-pin header plugs on them. But I think I've also got some Molex HDD-style power plugs that I could solder onto it instead if there's one free in your A4000. :smile: I'll have a rummage tomorrow.
Cheers!