Quectel EC25 Mini PCIe USIM detection problem (USIM_VDD=0V)

[Robin_Xiao]

I’m having the same issue here, but was wondering if the missing 15k pull-up between USIM VDD and DATA could be the cause.

Posted detail here

EC-25 Sim Detection issue, CME error 10, USIM VDD 0V

Hi We have around 100 terminals that use EC-25 Mini PCIe module for comms. Some of them works flawlessly Some will drop offline here and there that can resume connection randomly or by rebooting or by re-inserting sim card A few that never connects The issue is pretty much same as described in Quectel EC25 Mini PCIe USIM detection problem (USIM_VDD=0V) AT log will show CME error 10, basically can’t find sim card The Usim VDD is 0V on faulty ones, 1.8v on good ones On a closer look on the …