this post was submitted on 14 Jun 2024
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Are you sure you replaced the 5v regulator with a pin compatible one?
The tlv75733 is a linear regulator, so if you are giving it more voltage than it was set up for, it will get hot, as it has to soak up the difference.
Does the teensy act the same when powered by USB instead? If not, it's not the tlv.
Edit: the tlv has a thermal shutdown, so the shutdown is a direct result of the overheating.
Follow up edit: https://forum.pjrc.com/index.php?threads/one-component-on-teensy-4-1-gets-very-hot.62255/
Yes, The 5v regulator is the same and it is outputting 5.01v under load and 5.12v no load. Not sure why the first went bad but I’m guessing the POS 5v reg sent a spike on the 5v rail when it went bad and that damaged the TLV75733. The Teensy acts exactly the same connected to a USB unmounted from the board. It boots, runs for a min while the TLV heats up then the 3v3 drops and the Teensy crashes.