Teensy 4.0 running hot and not detected

R

RouxBeeDoobyDoo

New member
I've been using a teensy 4.0 for a few weeks now, and just ran into an issue with my Arduino not picking up the board. I've also noticed that it's been getting VERY hot, like uncomfortable to touch, but no burns. I haven't soldered anything new into it, and the only thing I can think of, is that it was running a slightly modified DigitalReadSerial with an added statement for usbMidi send signals.
 
Unless a part failed, I don’t think you can damage a Teensy by running a given sketch alone. Damage would typically be due to some hardware connection exceeding a limit, either voltage or current.
 
Fully agree with Joe's remarks above.
Did you try the "Memory Wipe & LED Blink Restore" procedure as described on this page?

Paul
 
I have tried the Memory Wipe & LED Blink Restore procedure which no light coming on even after 17 seconds of holding the button. Are there any other solutions that people might have? Is it possible to get this one replaced?
 
You have to release the button before about 17 seconds, but after the lights flash a couple times after 13 seconds or so. Is it possible you held the button too long when trying the restore process?

After this, you have to wait until the flash is erased before uploading something or removing power. Flash starts when the light turns on (solid) and ends some non-short time later when the light turns off.
 
I don't think so. I've tried at various different timings, and no LED comes on to indicate the wipe has been activated. No matter how long I hold the button, it doesn't have an LED, and any time I plug it in, it gets uncomfortably warm.
 
No blink at all on the red LED after holding the pushbutton for 13+ seconds is a bad sign. Sad to say, odds are strong the hardware got damaged.

Next step in troubleshooting is to look at the power supply voltages. First is the simplest, just look at 3.3V and 5V (Vin or Vusb) with a voltmeter. If you get 0 volts or very close to zero, that's usually a sign of a metal short. Often those sorts of problems are fixable if you can find and remove the stray metal. Zero can also happen if power is disconnected, but that's not the case if you have parts getting hot. If you see a small voltage, like 0.4 to 1 volt, that's usually a sign of a semiconductor short inside 1 or more of the chips. Those sorts of problems aren't usually fixable.
 
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