How-To: expose flip chip CPU dies

How-To: expose flip chip CPU dies (if this video to long, watch first 6 minutes and jump to 17:00) Warning: Do it only on a good ventilated working area or the fumes can be damage your lungs. Wearing a mask and protect your eyes. A collection of CPU GPU Die-Shots can be viewed on flickr: https://www.flickr.com/photos/1305612... step by step: (0:04)removing chip from package (1:41)preparing chip and removing solder balls (2:30)fill chip in epoxy (5:25)sanding to remove first metalllayers (8:31)continue with 9µm lapping film (10:57)finishing with 3µm lapping film presanding with: 3M 268L Microfinishing Film (30µm) prelapping with: 3M 662XW Diamond Lapping Film (9µm) endlapping with: 3M 661X Diamond Lapping Film (3µm) http://www.grafik-feti.de/ftp/Die-Sho... attention: after a while of lapping the chip becomes more and more concav and get a vacuum effect. It's hard to lift the chip up. If you continue, the cornes will be lapped earlier than the middle. It's not seen in the video, but some times I fix the chip with a heatgun at 100°C - 120°C. To fix it: Heaten up booth sides of the chip and put the non lapped side on a cold metall plate. If you do that, the lapped side is going to be straight or convex and you can continue with lapping. Check it with a blade and a light source. http://www.grafik-feti.de/ftp/Die-Sho... Music by NICOLAI HEIDLAS ("MODERN THEME”)   / modern-theme-free-background-music