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--- blog:x68_pro_fault2 [2020/09/15 14:16] – [Sharp X68000 Pro #2] john
+++ blog:x68_pro_fault2 [2020/09/17 13:57] (current) – [Removing IC's from Corroded Board] john
@@ Line 27: / Line 27: @@
 ==== First Interior Pictures ====
-That battery looks like it has leaked :-(
+There's a 1MB memory module which wasn't listed in the auction, so that's a small positive, but that barrel battery looks like it has leaked :-(
 {{:blog:img20200915120908.jpg?200|}} {{:blog:img20200915120919.jpg?200|}} {{:blog:img20200915120944.jpg?200|}}
@@ Line 50: / Line 50: @@
 {{:blog:img20200915124405.jpg?200|}} {{:blog:img20200915132216.jpg?200|}}
+That large green capacitor isn't there on my other board, nor is that //weird// twin resistor on R70.
 ----
@@ Line 56: / Line 58: @@
 So it looks like the IO board (which is the main part I wanted) is a write-off. I can only hope that the floppy drive, main board and RAM module are working... and then try them in various combinations to see if I can improve the functionality of the original system at all.
+----
+===== IC Donation! =====
+About the only way forward from here is to use the intact IC's from the new IO board (the one //with// corrosion), transplanting them onto the old IO board (the one //without// corrosion).
+Corroded IO board, with chips for removal:
+{{:blog:img20200916100513.jpg?500|}}
+Since I'm reasonably confident that the old IO board traces are intact, but that I've already had to replace several of the audio IC's, it's reasonable to assume that there are more faulty IC's.
+To do this, I'll need the following DIP sockets:
+   * 1x DIP 8
+   * 13x DIP 14
+   * 5x DIP 16
+   * 1x DIP 18
+   * 4x DIP 20
+   * 2x DIP 24 double space
+   * 3x DIP 40 double space
+   * 2x DIP 42 double space, half pitch
+==== Removing IC's from Corroded Board ====
+Took images of the IC's I was removing, just to verify with the [[blog:x68000_pro_ic_list|IC list]] I made for the original machine:
+{{:blog:img20200916100353.jpg?400|}} {{:blog:img20200916100439.jpg?400|}}
+{{:blog:img20200916100425.jpg?400|}} {{:blog:img20200916100404.jpg?400|}}
+.... components removed from right hand of IO board:
+{{:blog:img20200916120842.jpg?400|}} {{:blog:img20200916120847.jpg?400|}}
+Now to do the left hand of the board (the part which is heavily corroded)...
+{{:blog:img20200917125713.jpg?600|}}
+That's it. Completely depopulated of all IC's (except the two surface mount chips). Let's jump to installing those IC's [[blog:x68_pro_fault#so_what_now|on the original board]].