CS-LIME-27 (LimeSDR XTRX v1.3) - Hardware defect detected, unable to start via mPCIe, request support

Projects LimeSDR
1

Hello MyriadRF Team,

We have encountered a hardware issue with our CS-LIME-27 (LimeSDR XTRX v1.3) module. During initial testing, we found the device cannot be used normally due to quality problems, and we are requesting your support to check and process a refund.

Below are the detailed diagnostic findings:

Issue Description:
We detected a defect during diagnostics of the LimeSDR XTRX v1.3 module.

  1. When connecting via USB:
    When the module is connected via USB, after IC28 (ideal diode simulator, MAX402000ANS+ in our revision), we see a voltage of 5V on the VCC_EXT line, while the nominal range is 3.3 - 5V.
    - The FPGA IC starts up, and the LED indicators work (LED2 is constantly on, LED1 cycles once per second).
    - We have not yet tested PC connection functionality in this state.

  2. When connecting via LimeFEA mPCIe v1 (built-in USB):
    When connected through the LimeFEA mPCIe adapter, 5V appears on the VCC3P3_MPCIE input line. Downstream of IC23 and IC24 (ideal diode sim