Production boards are non-functional.

[EGawtry]

We have developed our application on a custom prototype board with a nrf52832 (laird BL652) and it works great.  We got in our production boards and all the IOs on the processor are not working.  It seems to program correctly from the JTAG (same code), just no response anywhere, UART, GPIOs, SPI, TWI nor BLE.  We have ohmed out all the connections and they are identical to the prototype board.

Anyone seen this before?  What are we missing?

Thank you,

-Erik

[ketiljo]

If you set up your project to use the 32 kHz crystal oscillator and your module doesn't have this, you will see weird behavior. 

[EGawtry]

Was just informed by the tech that the TWI/SCL pin (36) is stuck at 25 Ohms to ground.  Is that a bad chip and could that be causing this?

[ketiljo]

It can be caused by over voltage or ESD, hard to say. Remove the module and measure it again to verify if it's the chip or something else.