ASUS P4B533-VM MOBO Problem
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From: Paul on 24 Nov 2009 05:36 jw(a)eldorado.com wrote: <<snip>> > > Thermal epoxy? I did not know of that. That may be a great idea. > There is thermal grease on top of the chip though. > > Thanks again > > Duke Thermal epoxy is unforgiving. You get one chance to get it right. You can't remove it, without damage to the component you applied it to. I remember one poster here, who managed to glue something on crooked with thermal epoxy, and we had to explain to him, it was going to look like it did today, forever :-) So every time he looks inside the computer, he'll be reminded of the permanence of thermal epoxy. I've heard of some clever individual, mixing thermal epoxy with something else, to weaken the epoxy, with the intention of making it removable. If you've got the time for that kind of chemistry research, more power to you. Paul
From: jw on 24 Nov 2009 06:59 On Tue, 24 Nov 2009 05:36:22 -0500, Paul <nospam(a)needed.com> wrote: >Thermal epoxy is unforgiving. You get one chance to get it >right. You can't remove it, without damage to the component >you applied it to. > >I remember one poster here, who managed to glue something >on crooked with thermal epoxy, and we had to explain to him, >it was going to look like it did today, forever :-) So >every time he looks inside the computer, he'll be reminded >of the permanence of thermal epoxy. > >I've heard of some clever individual, mixing thermal epoxy >with something else, to weaken the epoxy, with the intention >of making it removable. If you've got the time for that kind >of chemistry research, more power to you. > > Paul Nope - I don't have any extra time these days. Thanks Duke
From: kony on 24 Nov 2009 14:13 On Tue, 24 Nov 2009 05:13:05 -0500, jw(a)eldorado.com wrote: >On Mon, 23 Nov 2009 22:10:16 -0500, kony <spam(a)spam.com> wrote: > >>On Mon, 23 Nov 2009 22:04:56 -0500, kony <spam(a)spam.com> >>wrote: >> >> >>>The board appears to use Intel 845G chipset, this is a flat >>>epoxy topped chip rather than a bare flipchip so if it is >>>beyond your means to resolder the loops on you might be able >>>to thoroughly clean off the heatsink base and chipset top >>>(use petroleum solvent if there is stubborn residue >>>remaining) and remount the heatsink with thermal epoxy >>>instead of the clip, but ultimately soldering the loops back >>>on, cleaning off the chip and heatsink, and using thermal >>>grease is a better option. >> >>I think the above is wrong, that 845G chipset is an open >>flipchip so you cannot use thermal epoxy, must instead >>solder the same or replacement loops. > > >What is an 'open flip chip'? Please excuse my ignorance. > >Duke See the pics on this page: http://www.tomshardware.com/cn/642,review-642-2.html The top 845G flipchip has a flipped over die in the center with minimal protection while the southbridge has the die encased in epoxy to create a flat plastic-like top that covers most of the chip, but is not good at tolerating or conducting heat so it can't be used on higher powered chips.
From: kony on 24 Nov 2009 14:18 On Tue, 24 Nov 2009 05:36:22 -0500, Paul <nospam(a)needed.com> wrote: >jw(a)eldorado.com wrote: > ><<snip>> > >> >> Thermal epoxy? I did not know of that. That may be a great idea. >> There is thermal grease on top of the chip though. >> >> Thanks again >> >> Duke > >Thermal epoxy is unforgiving. You get one chance to get it >right. You can't remove it, without damage to the component >you applied it to. > >I remember one poster here, who managed to glue something >on crooked with thermal epoxy, and we had to explain to him, >it was going to look like it did today, forever :-) So >every time he looks inside the computer, he'll be reminded >of the permanence of thermal epoxy. > >I've heard of some clever individual, mixing thermal epoxy >with something else, to weaken the epoxy, with the intention >of making it removable. If you've got the time for that kind >of chemistry research, more power to you. > > Paul Arctic Silver does have instructions somewhere for the mix ratio, it "might" (Or might not) be 1:1 with their grease but personally I would never trust such a mix, would be afraid it would come off during one of the thermal cycles. I do epoxy lots of 'sinks though, or at least used to before things that needed 'sinks more regularly had mounting holes adjacent on the PCB. Main gripe is the epoxy seems to go bad, I end up buying smaller quantities and storing it in the coldest part of the refrigerator, making it seem to stay good for about 2 years tops.
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