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Hardware / Re: HOT MINI
« Last post by aBc on May 16, 2024, 05:13:42 PM »
Kudos for the original thought of possibly using the desolder tool. Maybe removal of the teflon tip, replaced with a similar length of the nylon spacer stock (mentioned above) in its’ place, might then work as a pin removal tool?

I really don’t use the desolder pump that I have due to the “shocking” recoil of the thing when working on very small bits. (It’s quite unnerving to me, working so closely and with magnifying headgear on - so I revert to using solder wick instead.)

And I mean, that when you “fire” such desoldering pumps they don’t extend (shoot) that metal plunger out of the end “towards the board”. That’s only extended when you elect to push the “un-cocked” plunger down through the nozzle to clear any hardened solder out of that nozzle. So if the nylon stock could be cut & fitted instead, one might actually have their own special Mac Mini heatsink removal tool?

Well, worth a shot anyway. There’s a project for someone. (You did put the hemostats/forceps back into your fishing tackle box?) ;)

Looks like the processors’ mylar shield stuck to your heatsink (as if often the case). I usually remove that and don’t even attempt to reuse it. Also I peel the original thin foil off on the heatsink, which I assume originally served as a “paste-treated” barrier between the processor and the heatsink.


And looking at the red-outlined area, the white-ish looking areas are where the thing remained “stuck” to the processor (green dots). While the smoother, dark grey areas (yellow dot) might represent where actual heat-exchange contact was no longer in effect. (i.e. baked and separated.)

So whereas most recommend replacing heatsink paste every two-to-four years... some have G4 Mac minis that have never had this done (now, in nearly twenty years!).

Again, it would have been interesting to note the exhaust air temperature of your mini before replacing the paste. But big congrats on a job that many simply choose not to attempt!
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Aha! Whoops! I never thought about the hardenss of the nozzle. I did not actually use this though, just tried it.
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The nozzle of that desoldering tool is made of teflon, which is softer plastic than the one used for heatsink pegs, so it is now damaged.
Judging by the distance the plunger extends from the nozzle and that its not centered, I'd say that your tool is in pretty bad shape. Don't use it on delicate boards, like Mini, because it will scratch them, when you fire it. The effect (movement) is similar to the recoil of the gun - that metal part shoots towards the board.
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Many thanks for this. I'd already got my 1.5Ghz G4 Mac Mini up and running, but I was a little scared at removing those pegs. But I just went back in and it went pretty well. It was seriously caked solid and I had to soak the heatsink in white spirit for an hour. But once cleaned up then with a bit of Noctua's NT-H1 3.5g paste, it was soon back up and running!
I used some forceps (taken from my fishing box!). But I did try a solder removing tool. That has a tube that fitted nicely over the top of the peg. Unfortunately I had no way to push the peg out. However, once I'd reassembled the Mac, then I remembered that if you push the plunger in the tool it does extend a little rod that would likely have worked. Just a thought for somebody to try (..or me if I get a second G4!). Thanks
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I owned Apple computers growing up starting with an LCII.  I just bought a G4 mac mini to play some Escape Velocity.  I loved those games back in the day.
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Hi @Caleb! Just keep in mind the CD image you need to install Mac OS 9.2.2 on the Mac mini G4 is NOT the "generic" CD that is used to boot many other "unsupported G4s". You need specifically the appropriately-named Mac mini G4 Mac OS 9.2.2 CD image.

Get ready to have a USB audio adapter for it. You will probably need it These are easy and cheap to acquire last I checked.

If you run into monitor issues later, let us know...
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Hardware / G4 Mini install OS9
« Last post by aBc on May 15, 2024, 07:34:08 AM »
You won’t need the IDE/SATA bridge adapters if you eventually go with an mSATA config(s) as examined here:
(Costs have come down to the point they're competitive with the old SSD + adapter route.)

https://macos9lives.com/smforum/index.php?topic=5955.msg52638#msg52638

AND for dual boot scenarios... format and partition first with Drive Setup 2.1 and DON’T install OS 9 yet. Instead, after formatting and partitioning... install OS X Tiger on your 2nd partition (after reformatting ONLY the second partition with Tiger’s Disk Utility). Doing this will allow you to disable or omit the first (OS 9 intended) partition from Spotlight’s prying eyes BEFORE even installing OS 9 on the first partition.

All the above to avoid dreaded BTree errors & corruption associated with such dual boot installations.

THEN go back and install OS 9 on the first partition which remains formatted with Drive Setup 2.1. And yeah, you can road test all of this first with your original HD.

As for the exhaust air temp question... there’s a common ignorance that as long as these now nearly 20 year old machines are running fine and not exhibiting any blatant symptoms of overheating, that there’s really no need to clean and renew their heatsink paste. AFTER 20 YEARS! Only a matter of time, ehh?

Anyway, after extensive temp tests here with various versions of the G4 Mac mini - I found that in those minis that had not had paste renewed, that their exhaust air temperatures (from a cold boot) would often reach or exceed 110˚F (after only 15 minutes of runtime). So if your exhaust air temp reaches or exceeds 110˚ after 15 minutes, well... there’s your sign. (Fan racing or not.)

*I’ve supporting images of one of those showing where its’ paste had dried and powdered in some areas, thus losing optimum heat transmission. (Currently those images are now 600 miles away.) ::)

But this might be of some interest:
https://macos9lives.com/smforum/index.php?topic=6875.0

AND... https://www.youtube.com/watch?v=_7iXw9zZrLo

Cheerio  ;)
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I wouldn't go any newer than leopard, but probably just do tiger.
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Actually, if you decide to stay in OS9 only, 256MB is enough. 1GB for OSX is so-so. Maybe for Tiger it is ok, but in Leopard it's a pain.
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