exxos's Atari, Amiga & retro forum

For that many pins, and you’re not worried about the board, turn the board upside down, supported on the edges and use a blow torch to heat all the area where the COU is and then when all the solder is completely melted lift the board and then drop it to cause the chip to fall out.

Nice one, thanks Stephen. I have a 450/600c heat gun and I think most solder melts around 200/250c, so will that be OK? Can I put any liquid that will stop the heat on the board to minimise heat radiating in to the cpu.

It won't be any worse than the thermal impact from wave soldering. The PCB will be soaking up most of the heat.

This is basically the method I used to remove my 060.
Once it was out I used wife's hairdryer on cold just to get the CPU down in temp.
You don't want to thermally shock it.

I would also melt a big blob of solder nearby, then it might be more obvious that your 'up to melting temp' and it's time to remove the CPU.

Oh and you might need thick gloves handy!

I'll keep it's heat sink on, but good advice, thanks.
I've got the heat gun still out from another job so will have a go later. Then I can sell on the Nortel board and free some space. (Assuming there's a demand for it)

So I had a go with the heat gun, 450c setting, moving it over the underside on the soldered pins.
My test solder went soft and stuck to the pcb.
I pulled at the chip gently from the main side, nothing.
Went back for another minute. Everything on the board seemed super hot but no movement from the 68060.
Should I keep going or is there another method?
The solder looks neat with minimal solder in place. 👍

It's a lot of effort, added with the hefty purchase price, for an LC, isn't it?

matt020 wrote: 02 Feb 2024 14:32 It's a lot of effort, added with the hefty purchase price, for an LC, isn't it?

I'm with you on that but it was a punt and could have been a full fat 060. Not sure how much LC chips go for but would like to test it in my Falcon for compatibility. It was bought for $80 so about 70gbp

viking272 wrote: 02 Feb 2024 14:37

matt020 wrote: 02 Feb 2024 14:32 It's a lot of effort, added with the hefty purchase price, for an LC, isn't it?

I'm with you on that but it was a punt and could have been a full fat 060. Not sure how much LC chips go for but would like to test it in my Falcon for compatibility. It was bought for $80 so about 70gbp

This chip definitely doesn't have an FPU, so don't expect it. You can buy an unsoldered LC for about half that price.

You need the PCB really hot and heat soaked to the back to get the chip out, so heat it up well. The surface solder will melt first but you need the PCB hot enough to melt the solder on the other side too.

Once things are hot enough the chip will fall out if you left and drop the PCB.