Originally Posted by Mr. K6
Hmm... that's odd. What grit sand paper did you use? I wouldn't go less than 600-grit. Also, how thick was the shim? Again, I wouldn't go thicker than 0.025". Also, how was the thermal contact of the AS5 when you put the shim on and off? Was the GPU completely covered and the excess pushed to the sides (see my pics)? I just pulled off my keyboard to take a look at my GPU and my thermal pads on the top RAM are touching the RAM and the heatsink, although they aren't as compressed as I would like them to be (something I will work on soon). Anyway, sorry to hear it didn't go so well, maybe third times a charm?
Second shim though, though I started rough, I stepped down to 1000 grit, then used rubbing compound, metal polish, and finally, toothpaste to smooth it down. Then 'washed' it in isopropel alcohol to remove all the chemicals. That thing positively GLEAMED, even shiner and smoother than the bottom side of the heatsink. And I compared it to the original .025 thick copper sheet I started from and it was visually thinner (I don't have a micrometer). AS5-wise, I made sure the GPU was completely, but VERY thinly covered, and did the same on top of the shim. Honestly, I think I simply made the shim convex shaped because of edge sanding effects...causing only the center to be touching the heatsink and GPU.
I'm done for right now, about to go on the road a while. Also, I'm pretty smart with computers, but there's always a risk every time I crack open the laptop, screw or unscrew the bolts, pop the cover, etc. I'm just going to take a break from tinkering...maybe attack it later after I've been on the road a while.