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I performed actual IC surgery
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William Beaty
Jan 31, 2019, 4:47:20 PM1/31/19
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I PERFORMED IC SURGERY on an analog amplifier, custom dip-16. Removed
the gold cover. Pretty huge 1980s stuff, gold-on-ceramic hybrid.
But still. This was a custom IC, a patchclamp front end with a peltier-
cooled discrete amp, with a tiny peltier block, thermistor, and a
three-jfets diff amp. And a large piece of a dessicant pellet.
The thermistor had gone crazy from old age, shutting down
their -30C cooling.
axopatch photos
http://staff.washington.edu/wbeaty/chem_axopatch.html#photo
I've never had leadbond chips open before. I mean, besides looking
inside those ancient Western Digital 6805-type microcontrollers with
the eprom window.
Mantis inspection microscopes: still NOT cheap on eBay.
((((((((((((((((((((((( ( ( (o) ) ) )))))))))))))))))))))))
William J. Beaty Research Engineer
beaty a chem washington edu UW Chem Dept, Bagley Hall RM74
billb a eskimo com Box 351700, Seattle, WA 98195-1700
ph x3-6195 http://staff.washington.edu/wbeaty/
the gold cover. Pretty huge 1980s stuff, gold-on-ceramic hybrid.
But still. This was a custom IC, a patchclamp front end with a peltier-
cooled discrete amp, with a tiny peltier block, thermistor, and a
three-jfets diff amp. And a large piece of a dessicant pellet.
The thermistor had gone crazy from old age, shutting down
their -30C cooling.
axopatch photos
http://staff.washington.edu/wbeaty/chem_axopatch.html#photo
I've never had leadbond chips open before. I mean, besides looking
inside those ancient Western Digital 6805-type microcontrollers with
the eprom window.
Mantis inspection microscopes: still NOT cheap on eBay.
((((((((((((((((((((((( ( ( (o) ) ) )))))))))))))))))))))))
William J. Beaty Research Engineer
beaty a chem washington edu UW Chem Dept, Bagley Hall RM74
billb a eskimo com Box 351700, Seattle, WA 98195-1700
ph x3-6195 http://staff.washington.edu/wbeaty/
jurb...@gmail.com
Feb 1, 2019, 2:37:10 AM2/1/19
to
You got to be fucking kidding.
Well almost...
Well almost...
N_Cook
Feb 1, 2019, 3:53:57 AM2/1/19
to
I expected it to be the cause going to gel , like the breakdown of
con-formal coating causing chip failure.
I vaguely remember repairing an STK???? hybrid IC,fairly easy to break
open, that had been dropped and getting away with "bonding" the failed
usonic weld point , with silver loaded paint.
Ron D.
Feb 1, 2019, 2:35:11 PM2/1/19
to
Cool. Surgeries are done on internal battery backed up Dallas RAMS too to access the pins for the battery, The new battery is placed on top.
If you have the map where to remove the Epoxy, You stand a good chance of repair.
Desoldering the chip (heating it) might destroy it's contents.
FYI and ASIDE: Had an ultrasonic bonder at work to play with, but it did not work well.
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