I repaired my 1989 A2000 back in 2006 for a bad battery leakage. I thought I cleaned the PCB properly with a special battery spill cleaning formula but some remained on the CPU socket.
I had a black/green/yellow... screen at boot-up since a week or two. After a general cleaning with a scilicone based contact cleaner, I made it work intermittantly. I then isolated the issue to the CPU.
Seeing the socket leads being very corroded, I decided to replace it. Some of these 64 pin sockets are still available from Digikey at a reasonnable price.
Unsoldering this thing was quite a challenge since the lead used back then was not RoHS at all! :eek:
I managed to remove it bit by bit by cutting it in 4 parts. I felt like a dentist removing a wisdom tooth!
Well, after cleansing and all, tada!!
Soldering back the new machined socket was easy as 1-2-3.
It worked right-a-way!
Ok now back to my RGB to YPbPr circuit...
http://www.retronicdesign.com/en/new-product-in-developpement-amiga-rgb-to-ypbpr-components-video-converter/Cheers!