# VOXL 2 Mini apps IMU showing "PCB damage" / clock line disconnected

Source: https://forum.modalai.com/topic/5211/voxl-2-mini-apps-imu-showing-pcb-damage-clock-line-disconnected
Category: VOXL 2 and VOXL 2 Mini (https://forum.modalai.com/category/26/voxl-2-and-voxl-2-mini)
Tags: voxl-2-mini
Posted: 2026-05-19 13:46:57 UTC by cbay
Replies: 1 · Views: 871

## cbay · 2026-05-19 13:46:57 UTC

Running into intermittent IMU dropouts on my VOXL 2 Mini (M0104, SDK 1.8.06). VIO works for a while, then voxl-inspect-vins shows IMU_MISSING and pose stops updating for several seconds at a time. It recovers, but only after a service restart.
Checked journalctl -u voxl-imu-server and found this on startup:

```
trying BMI270 on bus 3
NOT BMI270, WHOAMI returned 0, expected 36
trying ICM42688 on bus 3
ERROR in test_basic_read, read the same values twice
WARNING initializing 42688, clock line may be disconnected, trying to turn it off
42688 IMU works without clock line, this indicates PCB damage
```
The driver is falling back to clockless mode on the ICM-42688p and running degraded. CPU isn't overloaded, no vibration during dropouts (just handheld walking around). Is "PCB damage" here a hard fault that needs RMA, or is there a config workaround?

## Reply by Paul Nusser (ModalAI staff) · 2026-05-20 17:25:25 UTC

Hi Cbay, 
There is a small clock buffer on the edge of the PCB. An RMA can only replace the whole board, not replace a single device. The part to check would be here: ![image (1).png](https://forum.modalai.com/assets/uploads/files/1779297839725-image-1.png)