# New LimeSDR USB no power

**URL:** <https://discourse.myriadrf.org/t/new-limesdr-usb-no-power/6627>\
**Category:** General Discussion\
**Created:** [18 October 2020 15:13 UTC](https://discourse.myriadrf.org/t/new-limesdr-usb-no-power/6627 "2020-10-18T15:13:55Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![jaspid](https://avatars.discourse-cdn.com/v4/letter/j/5fc32e/32.png) [@jaspid](https://discourse.myriadrf.org/u/jaspid)\
**Post date:** [18 October 2020 15:13 UTC](https://discourse.myriadrf.org/t/new-limesdr-usb-no-power/6627/1 "2020-10-18T15:13:55Z")

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I just received my LimeSDR unit and I haven’t been able to connect to it. I haven’t seen any LEDs light up when I’ve connected it to usb. I’ve tried three different computers with three different operating systems. I opened an RMA with Crowd Supply and they told me to come here first. Doing research I found some commonly requested measurements.

Here is what I get on my board when connected to USB port on Mac:

Vcc Ext: 3.8V  
Vcc Int: 0V  
FR38 to GND outside (closest to USB port): 5.16V  
FR38 to GND inside: 0V

Continuity  
FR38: open  
FR38 inside to GND: short

Are there any other measurements to take or anything else I can do?

Thanks.

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**Author:** ![andrewback](https://avatars.discourse-cdn.com/v4/letter/a/22d042/32.png) [@andrewback](https://discourse.myriadrf.org/u/andrewback)\
**Post date:** [20 October 2020 09:04 UTC](https://discourse.myriadrf.org/t/new-limesdr-usb-no-power/6627/2 "2020-10-20T09:04:41Z")

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@Zack could you advise, please.

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**Author:** ![Zack](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/zack/32/89_2.png) [@Zack](https://discourse.myriadrf.org/u/Zack)\
**Post date:** [26 October 2020 07:16 UTC](https://discourse.myriadrf.org/t/new-limesdr-usb-no-power/6627/3 "2020-10-26T07:16:33Z")

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Hi @jaspid,

Ask CrowdSupply for RMA, please. Sorry for that.