So, putting the blowtorch to the chip on a brick outside should combust a layer of epoxy. Moving in circles around the die location (in the middle), I get the nice candle-like flame.
Show this thread
-
-
Once the yellow flames disappear it then gets dunked into water immediately - this induces a thermal shock around the die. The spent epoxy then just rubs off in water by fingerstrength. After two runs of this, the legs gave enough purchase to break off the majority of the epoxy
1 reply 0 retweets 0 likesShow this thread -
To finish off, I used a scalpel dragged backwards over the die, and then some IPA and a cottonbud to clean off the remaining epoxy. So, here is the result on a slide... You can see the die is fully exposed! o/
pic.twitter.com/g0fyId75cB
1 reply 0 retweets 1 likeShow this thread -
And here it is under a microscope!! :D sokephitosnfrok just poking my phone over the eyepieces... you can make out some of the details... Though I need to improve the lighting a lot and the imaging. Early days!!pic.twitter.com/wl94AxBBjT
1 reply 0 retweets 1 likeShow this thread -
Here is a photo courtesy of @adhorden's phonepic.twitter.com/qKAHfw74iv
1 reply 1 retweet 6 likesShow this thread -
So, now I need to maybe do another attempt and read more of
@marcan42's and@johndmcmaster's stuff to work out what is going on in this custom toaster controller x-P1 reply 0 retweets 0 likesShow this thread -
As an aside, the AMAZING Aidan at
@makeinsalford machined me this! (Still need to add the screws) for this neopixel microscope light mount :D can't wait to try it out properly!pic.twitter.com/2vf9p0ZJpz
1 reply 0 retweets 2 likesShow this thread -
Thank to
@leedshackspace for the blowtorch and microscope access!!! :D first successful run.2 replies 0 retweets 6 likesShow this thread -
Replying to @LargeCardinal @leedshackspace
Hector Martin Retweeted Hector Martin
This decap was done with the exact same method, except instead of a blowtorch I used a gas range, and instead of thinking about flames I just cooked the thing until I was pretty sure the epoxy had sufficiently decomposed. Dunk then scrape scrape scrape.https://twitter.com/marcan42/status/1013072621460549633 …
Hector Martin added,
1 reply 0 retweets 2 likes -
Replying to @marcan42 @leedshackspace
Very nice! :D What do you use for the lighting in the first photo? I'm going to reconfigure the extant microscope in the hackspace :P
1 reply 0 retweets 0 likes
Replying to @LargeCardinal @leedshackspace
There's a ring light around the objective, and I may have used some random flashlight on the side to get more interesting contrast on top.
10:13 AM - 28 Oct 2018
0 replies
0 retweets
1 like
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.