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Of course, but your blind guesswork / the guesswork of the collective has way higher chance of success then my own.
Without the posts here i would have never ever applied heat to the teensy over a...

okay so apparently it works now.

apologies again i didn't want to be rude with asking about warranty.

with the thought of certain defeat i did rinse it with H2o and ethanol again, did even...

did compare the verbose output of both teensys now.

The healthy working one :

19:19:59.508 (ports 5): WM_DEVICECHANGE DBT_DEVICEARRIVAL
19:19:59.509 (ports 5): found_usb_device,...

No offense taken.
I also did not intend to offend.

Well my first teensy was over a year ago, of course there wouldnt be any warranty on it anymore.
Well...cant help but am disappointed, though...

I practically can reflash the Teensy over and over again when iam pressing the button after the first programming was finished, i can do this up to 3-4 times till the teensy finally fully disconnects...

17:58:10.867 (ports 5): WM_DEVICECHANGE DBT_DEVICEARRIVAL
17:58:10.867 (ports 5): found_usb_device, id=\\?\usb#vid_16c0&pid_0478#00134c0a#{a5dcbf10-6530-11d2-901f-00c04fb951ed}
17:58:10.867 (ports...

reheated all pins at 300°C and also the pins on the chip, did put the iron directly onto the chip too.
Same behavior, no change.
Used a toothbrush with 70% isopropanol 30% aqua dest. to brush off...

Yes of course.

Curious how its possible that they are so sensitive?

I guess unless im able to somehow fix it im not eligible for a replacement as well, i did solder headers onto it after all.
...

non that i can see.
The .65 ( replacement for the two diodes?) looks though as if there would be an air gap between its contacts and the PCB. at least when i look at it under 10x with my microscope....

Greetings,

I did buy a 2. Teensy now after over a year of being amazed by my first.
The first initially had some problems after i soldered the headers on but it was resolved by rinsing it and...