nRF52832 module dead once being mounted on custom PCB

[Avadacadabara]

Dear all,

We're developing a custom HW with several nRF52832 chips on one board. For convenience we applied third party module instead of building minimum system by ourselves.

But one of the module at certain position cannot be detected by JLINK. Peripheral circuits are similar for all six modules but only the one in the middle comes up with such problem. We've tried the module independently before mount it to PCB and it works. But the module is dead once we soldered it to PCB.

What might be the cause of that?

Thanks ahead,

Ava

FYR, following pics are scopes our SCH and PCB file of two nearby modules(above description indicates the module on right hand side):

[Avadacadabara]

Solved, we mounted inductors to enable the DCDC and it can be detected by JLINK.

But only this module has such restriction.

[ketiljo]

If you tested with the DCDC enabled before you mounted the module and the DCDC inductor was missing or not correct, this will happen as the DCDC can't supply the device if it's not working. If the DCDC wasn't enabled, it should work with the internal LDO.