Originally Posted by Dmitriy
Please share some picture of pressure film before lapping and after. Very interested to see your results.
Will take a pressure test before doing anything. Then one after lapping the HS. Depending on how the pressure test looks, ie if it's perfect I'll stop there, but if it's not I'll lap the IHS and take another pressure test. Will post all 3 (or 2 depending on 2nd test) in order.
btw: They shipped my stuff today, ordered last night at like 11pm and they shipped on Saturday. UPS Ground, if I'm lucky it will be here Monday.
Oh, big question. Should I do my pressure tests/lapping before or after I delid the CPU? I'm thinking the deliding process using the Anvil method might create slight deformations of the IHS, so should I lap before or after for best results?
Or maybe lap it before, then after I get the CPU DeLided, cleaned, thermal'd and reassembled just check to make sure the IHS didn't deform by running it over 2500 grit paper to see if it made any high spots. That might be the best, because I rather not lap after deliding I would assume without the glue it might make it more likely to get dust/water inside the IHS during Lapping... (anything over 1500 grit you should wet sand)
For the CPU I picked up $4.99 assorted autobody sandpaper. Comes with 1000, 1500, 2x 2000 and 2500 grit sandpaper. Then I'll use autobody rubbing compound w/ microfiber cloth to get a glass finish on the CPU.
Anyone got any comments on what I intend to do? have a few days before I have everything so if there are any further requests, comments or suggests let me know. (note: will take pictures of the chip before removing thermal paste, after it's cleaned and with new thermal paste)
Another question, anyone ever tried lapping the chip? Might sound like a horrible idea, but it is metal and probably a few thousands thick so lapping with 2000/2500 grit paper shouldn't penetrate the chip I would think. hmmm wonder if a pressure test between the chip/IHS would be worth doing? (note only have 3 pressure test pads total...)
Edit: Had an idea just now, if I take black magic marker and paint the entire surface of the IHS, then rub it against dry 2000 grit paper it will take the black off where it contacts. So if there are dips, pits, etc it will leave the black marks in those spots. And if there are high spots it would leave black between them. I can do this with the Heat Sink, IHS and chip. Have the think a bit if I can find something perfectly flat small enough to fit inside the IHS (ie chip side) to check that side of the IHS for flatness. I can take pics of them painted and after sanding, to show the prevalence of highspots/pits/dips ect on the chip/ihs/hs. prior to lapping, then against after lapping to see improvements. In addition to the pressure paper tests of course.Edited by JacekRing - 8/3/13 at 9:23pm