Electronics > Repair
Sonicare tootbrush teardown and repair
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reagle:
Just posted the writeup of my Sonicare toothbrush repair.
http://kuzyatech.com/philips-sonicare-hx6710-teardown-and-repair

Spoiler alert- I can't believe they don't conformally coat these things!
amyk:
I can't believe it has a PIC! A toothbrush needs 14KB of program memory...? :o

But certainly, it would be even more surprising if it was an AVR.

Did you see if there were any interesting signals on the serial port? If I were you my curiosity would at least make me try probing and dumping the firmware, if only to see if they'd put some sort of self-destruct counter in there (unlikely, however.)
george graves:
It would have been hilarious if there was a 328p DIP in there running an arduino boot loader.  Now *that* would have been funny.
Stonent:
I think when Dave did his toothbrush teardown he found a microcontroller in it.



amyk:
That was a 4-bit mask ROM (3kB) controller with 40 bytes of RAM, something more expected for this application.
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