I have a Teensy 4.1 wo ethernet I got from a friend who said it wasn't working correctly. Well, friend of a friend so I don't have much information on what it was used for when it started acting up. The pads are cut to separate vin from vusb so I'm assuming it was powered by some kind of external battery or other supply. I do have a couple other Teensy's myself so I know my setup should work properly.
It does power on and work with 5v on Vin or usb by jumpering the Vin/Vusb pads. I reset it by holding program button and the blink program seems to be working properly.
I noticed the voltage regulator (or something around it) was getting pretty hot pretty quick.
I was able to pull voltages and am reading 4.54v on the 3.3v pin. It was pulling around 410mA from the power supply. I'm reading around 11.1ohms from 3.3v to Gnd. The program button doesn't seem to change the voltage on the 3.3v pin but does reset the Teensy program. It stops it and the red led by the usb lights up, but the program doesn't seem to restart after releasing the program button. Cycling the power restarts the blink program. I think I saw on one post here where that program button should put 3.3v to gnd possibly but not for sure.
Again, it is powering up and connecting to the pc via usb. I do not think it came with pre-soldered leads so I looked over and tested the ones that have been soldered on. They appear and test ok, but I guess something could still be wrong there. I've read a lot on here with low or no voltage on the 3.3v pin but nothing I've seen reading higher than the 3.3v.
Just wondering if anyone has any suggestions on where to start troubleshooting. I haven't really left it on for very long as I don't want to completely destroy it since it's getting so hot. I'm attaching two pics here as well.
Thank you in advance for any help or suggestions.
It does power on and work with 5v on Vin or usb by jumpering the Vin/Vusb pads. I reset it by holding program button and the blink program seems to be working properly.
I noticed the voltage regulator (or something around it) was getting pretty hot pretty quick.
I was able to pull voltages and am reading 4.54v on the 3.3v pin. It was pulling around 410mA from the power supply. I'm reading around 11.1ohms from 3.3v to Gnd. The program button doesn't seem to change the voltage on the 3.3v pin but does reset the Teensy program. It stops it and the red led by the usb lights up, but the program doesn't seem to restart after releasing the program button. Cycling the power restarts the blink program. I think I saw on one post here where that program button should put 3.3v to gnd possibly but not for sure.
Again, it is powering up and connecting to the pc via usb. I do not think it came with pre-soldered leads so I looked over and tested the ones that have been soldered on. They appear and test ok, but I guess something could still be wrong there. I've read a lot on here with low or no voltage on the 3.3v pin but nothing I've seen reading higher than the 3.3v.
Just wondering if anyone has any suggestions on where to start troubleshooting. I haven't really left it on for very long as I don't want to completely destroy it since it's getting so hot. I'm attaching two pics here as well.
Thank you in advance for any help or suggestions.