I have two dead Teensy 3.6 boards that died without obvious cause.
Each one had an audio adapter soldered in place (piggyback) and a ground wire to my oscilloscope, but no other connections to the Teensy other than the USB port. Each worked in the evening, was unplugged from USB overnight, and simply failed to light up when plugged in the next morning. In both dead boards the resistance between the VDD network and ground is about 53 Ohms, which causes the board to draw enough power to shut down the resettable fuse.
Static? USB surge? Excessive heat while soldering, with delayed failure? In both cases the audio board headphone output was connected to a mixer, and there is a significant ground loop problem in this lab -- but I can't see how that would fry anything on the Teensy.
Anybody have any thoughts?
I'll start pulling components off and testing them, but without a component placement guide it's more complicated than I'd wish.
-- Craig
Each one had an audio adapter soldered in place (piggyback) and a ground wire to my oscilloscope, but no other connections to the Teensy other than the USB port. Each worked in the evening, was unplugged from USB overnight, and simply failed to light up when plugged in the next morning. In both dead boards the resistance between the VDD network and ground is about 53 Ohms, which causes the board to draw enough power to shut down the resettable fuse.
Static? USB surge? Excessive heat while soldering, with delayed failure? In both cases the audio board headphone output was connected to a mixer, and there is a significant ground loop problem in this lab -- but I can't see how that would fry anything on the Teensy.
Anybody have any thoughts?
I'll start pulling components off and testing them, but without a component placement guide it's more complicated than I'd wish.
-- Craig