Hi all,
I am mentoring a group of students that are using the teensy 4.1 , they have been having problems with the VIN source exceeding well above 5 volts because of faulty circuits which led to damaging the teensy. The teensy doesn't get recognized by laptops anymore and the PTC fuse gets really hot when power is applied to it. The intended way to power the teensy was to power it with a 5V LM7805C Voltage Regulator, with a 12V input and a 5V output going directly to the VIN of the board.
When inspecting the damage I could feel that the PTC fuse is getting really hot, the rest of the components are not. I am wondering what this means exactly, from existing posts on this forum I understood that the PTC fuse is rather a resistor that stabilizes the current and doesn't actually blow like a fuse. As the fuse is still getting hot I wonder if the fuse itself may be damaged and/or something on the board might still be damaged? Also, does the PTC fuse in a way save other components from getting damaged or is it more like an indication that something is already or still is damaged?
Does anyone know some troubleshooting steps I could follow in order to find the part(s) that need to be replaced to revive the teensy, that is if it is possible at all?
Thank you in advance!
I am mentoring a group of students that are using the teensy 4.1 , they have been having problems with the VIN source exceeding well above 5 volts because of faulty circuits which led to damaging the teensy. The teensy doesn't get recognized by laptops anymore and the PTC fuse gets really hot when power is applied to it. The intended way to power the teensy was to power it with a 5V LM7805C Voltage Regulator, with a 12V input and a 5V output going directly to the VIN of the board.
When inspecting the damage I could feel that the PTC fuse is getting really hot, the rest of the components are not. I am wondering what this means exactly, from existing posts on this forum I understood that the PTC fuse is rather a resistor that stabilizes the current and doesn't actually blow like a fuse. As the fuse is still getting hot I wonder if the fuse itself may be damaged and/or something on the board might still be damaged? Also, does the PTC fuse in a way save other components from getting damaged or is it more like an indication that something is already or still is damaged?
Does anyone know some troubleshooting steps I could follow in order to find the part(s) that need to be replaced to revive the teensy, that is if it is possible at all?
Thank you in advance!
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