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Offline KarlosTopic starter

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Changing heatsinks
« on: September 06, 2003, 01:44:34 PM »
Hi,

I'm currently dragging an old Apollo 040 card out of retirement for my A1200. It's in a bad way but I reckon it could be made to live and breath again.

One of the nuisance factors is the old fan/heatsink. The old fan sounds like a motorcross bike and the heatsink is bonded to the chip.

I have a very low profile, (and quiet) 5V fan/heatsink  I'd like to install in its place, only marginally taller than the original heatsink.

Does anybody know a 'safe' way to remove the old heatsink? I'd rather not take a chisel to it :-)
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Offline KarlosTopic starter

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Re: Changing heatsinks
« Reply #1 on: September 06, 2003, 03:30:08 PM »
Brute force, eh? I do have some scary visions of shattering the ceramic of the CPU however ;-)

I was thinking that I might be able to wedge it off...
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Offline KarlosTopic starter

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Re: Changing heatsinks
« Reply #2 on: September 06, 2003, 03:33:41 PM »
Hey, I got it off!!! :-D

@ Doobrey

I just got the heatsink off no problem. I simply prised it off with a pair of narrow tip pliers. Just gently ease the end vanes of the heatsink and voila :-)

-edit-

The only downside is that the nasty blue coloured glue stuff is still stuck to the CPU. I guess it's thermally conductive though, so I'm not too worried

-edit #2-

Now I just need to find a nice +5VDC line on the card I can tap for the fan. Either that or power it from a connector somewhere...
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Offline KarlosTopic starter

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Re: Changing heatsinks
« Reply #3 on: September 06, 2003, 03:46:28 PM »
With some thermal grease and a pair of small plastic clips ;-)
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Offline KarlosTopic starter

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Re: Changing heatsinks
« Reply #4 on: September 06, 2003, 03:59:46 PM »
Yeah, the old fan was +12VDC. The card is going into a desktop 1200 (I already have a towered 1200 with BlizzPPC).

The fan I have is +5VDC, covers the whole CPU area and is much lower noise :-)

I am thinking to source a pair of connectors so that I can remove the card and simply 'unplug' the fan from wherever I choose to draw power (probably the floppy).

My old desktop (pre tower) had a pair of power connectors that fed power seperately to the motherboard and to the drives via a molex connector I fitted to the back of the case. The whole system was thus powered via two power cables from a 200W PSU. I might do something similar again :-)
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Re: Changing heatsinks
« Reply #5 on: September 06, 2003, 04:13:57 PM »
Indeed it is. I sent it to Vincent who had it for a bit but it tuned out to be wrecked and he returned it a while ago.

I wasnt able to test it myself since I had no desire to rip my 1200t apart for it so it sat idle for a bit.

I went home last week to visit the folks and grabbed a bunch of a1200 bits I had lying around to build myself a 1200 wedge again and thought I'd try the 040 card.

It is wrecked, but I think I know what is wrong with it (the cards boot ROM is physically damaged) so I'm trying to fix it...

-edit-

Incidentally, that's a good memory you have there matey ;-)
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Offline KarlosTopic starter

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Re: Changing heatsinks
« Reply #6 on: September 06, 2003, 04:17:30 PM »
Yeah, I guess, but I dont mind sourcing a 5VDC line from somewhere. A power regulator to step the voltage down might be a bit better, but I'm not sure what the waste is like. Probably more than the resistor...
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Re: Changing heatsinks
« Reply #7 on: September 06, 2003, 04:19:39 PM »
:lol: It seems I used to have one but the last few years have seen it reduced to sieve like powers of retention ;-)
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Re: Changing heatsinks
« Reply #8 on: September 06, 2003, 04:27:52 PM »
Well, V/I = R. In this case my fan is rated at 5V, 0.14A

So 7/.14 = 50 Ohms? Seems pretty low. The closest youd get is what, 47 Ohm resistor?
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Re: Changing heatsinks
« Reply #9 on: September 06, 2003, 04:46:12 PM »
Quote

Brian wrote:
Ehm... resistors ain't a good option to lower V. Sure it does the trick but for it to work it creates heat. For shorter intervalls it'll work but when you're driving a motor for longer intervalls as with the fan you will most likely burn the resistor


Yeah, that's what I was thinking when I worked out the resistance and it came out so low - I can imagine a lot of heat dissipation for 50Ohm...
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Offline KarlosTopic starter

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Re: Changing heatsinks
« Reply #10 on: September 06, 2003, 06:00:56 PM »
Well, the new cooling is working fine and much quiter. The card is still knackered though :lol:
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Offline KarlosTopic starter

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Re: Changing heatsinks
« Reply #11 on: September 06, 2003, 07:02:58 PM »
Wow, my card seems to be a prototype :-o

The rom is socketed (this is where the problems lay. I was just working on it and the label started to peel off the rom chip. Lo and behold, it is an UV erasable kind!

Man, that sure explains a lot :-)

Anyhow. a moment ago I got it to configure, saw that it was working from the early startup.

Things are looking up :-)

-edit-

Famous last words :lol:

Dead again!
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Offline KarlosTopic starter

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Re: Changing heatsinks
« Reply #12 on: September 06, 2003, 09:50:27 PM »
Well, it's up and running again....

I just played AB3D on it for a good 40 mins. Nostalgia overload there.

What I need to do is to desolder the socket and mount the chip directly. A couple of legs are half missing :-)

The problem is that the bloody solder contacts are minute. I get the sense that I will doubtless knack it up...
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Offline KarlosTopic starter

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Re: Changing heatsinks
« Reply #13 on: September 06, 2003, 10:19:42 PM »
Yeah, it is.

The problem is that the socket adds 5mm to the height which causes the ROM chip to be pressed against the top of the SIMM when inserted. This is what has caused the gradual mechanical damage over time.

Without the socket, thered be ample space. I noticed that later revisions of the card all had the ROM directly mounted on the card.
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Re: Changing heatsinks
« Reply #14 on: September 06, 2003, 10:34:53 PM »
Like I said, the solder junctions are tiny and the tracks are really, really thin. I'm not totally convinced I can remove it without damaging it beyond repair.

Just now it's working, but I know that if I just so much as look at it in a funny way, its going to spit the dummy on me again.

Funny, until yesterday I wouldn't have cared about it. Now that I have a use for it, I'm a bit more cautious :-)
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