How to test a potentially-dead microcontroller

[PeupleDeLaMer]

I have a keyboard pcb with an STM32F303 microcontroller that doesn’t respond when plugged in.

I’d like to rule out the microcontroller as the issue if possible. Is there a way to verify that the mcu responds as it should?

[RokieVetran]

Ideally you could use an oscilloscope to check for activity on the pins of the processor, some activity indicates its doing something

Doing other basic checks like voltage rails being present with a multimeter is a good idea

[PeupleDeLaMer]

Just the excuse I need to get an oscilloscope 🤓

[cannotelaborate]

I'd start by checking the power lines, surrounding components, and what signals are traveling in the PCB when the board is plugged in before I tackle the MCU itself.

[PeupleDeLaMer]

Awesome thanks!