I have a project that is using a Teensy 4.1, the cheep 5v regulator I was using in the project let the magic smoke out for no good reason. I replaced that but now the Teensy boots and runs for about a min then quits. There is a TLV75733P power IC that is supplying the 3v3 and it gets hot then quits supplying power. Since that IC is $0.46 vs a new Teensy 4.1 ~ $40 I want to try and replace it. I have done a bit of SMD work but not tried to remove a tiny chip with a GND pad before so I’m looking for any tips. The PCB of the Teensy has header pins so I can’t really get good contact to a hot plate to preheat the board.
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.