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Gently deliding soldered CPUs: Which heating source?

post #1 of 8
Thread Starter 
Hi, I want to delid my 955BE after some successful practice with my dead old Athlon64 x2 4800+ and my fully working Athlon II x2 2xxE <- probably razor method.

What would be the most gentle heating source for soldered DIEs (955BE)? I've seen methods with: torch lighter or the like, electric iron, soldering bolt and heatgun, There also was a guy in this forum, wo sanded the whole HIS stun.gif
I've seen a view posts about some kind of liquid that softens soldering tin (after ~30 min. of application time you can peel it off), but nobody used this for deliding as far as i know, would this even be possible?!

Thanks
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post #2 of 8
I would probably try a hot-air reflow station with temperature control if you have one.
post #3 of 8
Thread Starter 
I've got a simple heat gun, but without accurate temp control (two-step switch). Repaired some PS3 consoles from rlod in the past...
How much degrees would I need? Edit: If it's the same kind of solder (same melting point), I would be fine, right?
Edited by IrvineG - 1/23/16 at 12:53pm
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post #4 of 8
post #5 of 8
Thread Starter 
I thought about it once again: Since we exactly know (more or less) where the DIE is soldered to the HIS, shouldn't we focus more on heating up that single spot? If I use a heat gun / reflow station, I would heat up everything. If I use a soldering bolt (or maybe a torch lighter), I'm able to focus on heating up the soldered spot.
Edited by IrvineG - 1/26/16 at 10:37am
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post #6 of 8
You should try to keep the heat mostly uniform.
post #7 of 8
Delidding a soldered CPU? Seems counterproductive. But anyways, you don't want a gentle heating source, the longer it takes to remove the lid, the more heat gets transferred to the die. You want something heavy duty and VERY hot that will melt the solder instantly so you can pull the lid off immediately - something like a Weller 100w - the lid should be loose in less than half a second and the CPU will still be cool to the touch.

edit- This is the same technique for soldering batteries to prevent damage and potential explosions.
Edited by 8 Lug Mike - 1/30/16 at 2:29pm
post #8 of 8
Battery tabs are spot welded on with a very hot very quick burst because you don't want the chemical contents to get hot, and because the surfaces are just plain nickle plated metal tabs.
Unfortunately the thermal expansion of copper is about 6 times higher than silicon. It's OK for the CPU to get to solder melting temperature for a short time, and I am sure Intel/AMD use some sort of reflow heating profile.
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