# FMU issues with pixhawk mini

**URL:** <https://discuss.px4.io/t/fmu-issues-with-pixhawk-mini/3826>\
**Category:** Uncategorized\
**Created:** [July 7, 2017, 7:59pm UTC](https://discuss.px4.io/t/fmu-issues-with-pixhawk-mini/3826 "2017-07-07T19:59:08Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Bharath\_Nagarajan](https://discuss.px4.io/letter_avatar_proxy/v4/letter/b/3e96dc/32.png) [@Bharath\_Nagarajan](https://discuss.px4.io/u/Bharath_Nagarajan)\
**Post date:** [July 7, 2017, 7:59pm UTC](https://discuss.px4.io/t/fmu-issues-with-pixhawk-mini/3826/1 "2017-07-07T19:59:08Z")

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Multirotor assembled and QGC tells me it’s ‘armed’ when i input the arming sequence on my radio, but the motors do not spin. the amber i/o led blinks at about 4hz. According to pixhawk 2 this means “No FMU input”

Question 1: Is this the same for Pixhawk mini?  
Question 2: If so how can i fix this ?

Also the horizon and compass do not move when I change the orientation of the board.

Question 3: is this related to the FMU project

sorry for being a n00b, but help would be awesome.  
Thanks in advance!

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**Author:** ![dagar](https://discuss.px4.io/user_avatar/discuss.px4.io/dagar/32/22_2.png) [@dagar](https://discuss.px4.io/u/dagar)\
**Post date:** [July 9, 2017, 4:16am UTC](https://discuss.px4.io/t/fmu-issues-with-pixhawk-mini/3826/2 "2017-07-09T04:16:37Z")

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Can you try flashing PX4 master (under advanced in QGC)? There was a bug affecting the sensors in the pixhawk mini if you don’t have an external compass connected.

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**Author:** ![Bharath\_Nagarajan](https://discuss.px4.io/letter_avatar_proxy/v4/letter/b/3e96dc/32.png) [@Bharath\_Nagarajan](https://discuss.px4.io/u/Bharath_Nagarajan)\
**Post date:** [July 11, 2017, 7:42pm UTC](https://discuss.px4.io/t/fmu-issues-with-pixhawk-mini/3826/3 "2017-07-11T19:42:07Z")

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Ahh yes that worked. However another powering issue exists with my setup. The BEC seems to power the FC {LEDs go on} but the receiver only powers on only with USB. What’s funny is that if I power the FC with both BEC and USB simultaneously and disconnect the USB {BEC only} the receiver remains turned on. Do you have this issue as well?