swapping CPU's - good ways to pull a CPU

[Patrickool93]

The same happened to me, but I just forced it in, and it works fine, but it can be difficult because it's bent so oddly.

 

[Unknown_K]

My Newertech 040/50 CPU upgrade came with a CPU prying device that got my 040/33 out of my 950 very easily. It looks like a small fork but the teeth are very small and there are alot of them.

 

[fidel]

... chip puller tools...
... I use a tiny screwdriver and slowly pry around the processor until it pops out.

When I was ready to restore the LC back to the 631, I got in a hurry and bent the pins. Some of the pins may bend at the middle of the pin, rather than at the point where it meets the processor package. If this happens, it's hard to straighten them out.

Butter knife, again: multiple bent pins can be straightened by inserting an object - substantially as wide as the gap - between rows of pins, then twisting that object along its long axis, using the base of the adjacent row of pins as the fulcrum. This trick works vertically, horizontally, and diagonally on the face of the pin-side of the chip. Assess your progress by sighting edgewise over the chip along any row of pins - up, down, or diagonally - to ensure that all in that row are as neat as fence-posts.

For middle-bent pins you may have to go at individual pins with a pair of surgical tweezers or a hemostat (which is a very useful tool to have, btw, so grab one if you see one - or talk to your dentist).

As for chip removal, I recommend a gentle twisting action along the shaft of a good-quality, small, flat-bladed screwdriver - such as you'd find in a jeweller's set - and lots of iterations of insert-twist-withdraw-sideslip-insert...

 

[risc_management]

... chip puller tools...
... I use a tiny screwdriver and slowly pry around the processor until it pops out.

When I was ready to restore the LC back to the 631, I got in a hurry and bent the pins. Some of the pins may bend at the middle of the pin, rather than at the point where it meets the processor package. If this happens, it's hard to straighten them out.

Butter knife, again: multiple bent pins can be straightened by inserting an object - substantially as wide as the gap - between rows of pins, then twisting that object along its long axis, using the base of the adjacent row of pins as the fulcrum. This trick works vertically, horizontally, and diagonally on the face of the pin-side of the chip. Assess your progress by sighting edgewise over the chip along any row of pins - up, down, or diagonally - to ensure that all in that row are as neat as fence-posts.

For middle-bent pins you may have to go at individual pins with a pair of surgical tweezers or a hemostat (which is a very useful tool to have, btw, so grab one if you see one - or talk to your dentist).

As for chip removal, I recommend a gentle twisting action along the shaft of a good-quality, small, flat-bladed screwdriver - such as you'd find in a jeweller's set - and lots of iterations of insert-twist-withdraw-sideslip-insert...

Next time you are in 1995, bring me a hemostat (joking, of course)

Actually, your advice is very sound and useful in this thread. I wish I'd had it back when '040s cost real money. I had tried the butter knife and needle nose pliers, but I just couldn't get them aligned well. I believe I got pissed-off on the final attempt and just gave up on the poor 630.

I still have it in storage }

 

[LCGuy]

You should get it going again! 68LC040s are dirt cheap, and that Mac is like, practically brand new :O