# LimeSDR failed

**URL:** <https://discourse.myriadrf.org/t/limesdr-failed/5220>\
**Category:** LimeSDR\
**Created:** [4 October 2019 09:18 UTC](https://discourse.myriadrf.org/t/limesdr-failed/5220 "2019-10-04T09:18:05Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![DmitryP](https://avatars.discourse-cdn.com/v4/letter/d/bc79bd/32.png) [@DmitryP](https://discourse.myriadrf.org/u/DmitryP)\
**Post date:** [11 October 2019 09:22 UTC](https://discourse.myriadrf.org/t/limesdr-failed/5220/4 "2019-10-11T09:22:07Z")

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HI @andrewback and @Zack!

Thank you for your replies!

I haven’t used external PSU. My LimeSDR was used to broadcast analog television through only one channel. Since I do not have a license for these frequencies, I used only half the transmit power. The RF receive functions were not used and the television was about a meter away. I decided that an external PSU would not be required in these conditions. Was I wrong? Is it possible that insufficient power damaged the board?

I found two cases when people faced a similar problem without an external power source.

On Feb 23 2019 user @G0MJW

> [@External power supply damaged board?](https://discourse.myriadrf.org/t/external-power-supply-damaged-board/1207/60):
>
> No nothing - and I wasn’t even using an external supply when it happened. It was just running off USB, idling as I was doing DATV stuff. Worked earlier and then was cold and dead. I see the ferrite choke identified above has failed and there is a low impedance on the far side of it. I think something has failed in the power supply, or worse. No idea how to proceed apart from sending it back.

On Jul 3 2017 user @Jagmills

> [@No power for a new LimeSDR](https://discourse.myriadrf.org/t/no-power-for-a-new-limesdr/1412):
>
> Hi all, I finally received my LimeSDR board yesterday. Sadly, I don’t think it is receiving power at all over USB, as nothing at all happens when being plugged in frowning I’ve already fired an email off to Crowd Supply, but thought I’d post here with my troubles in case I’m missing anything completely obvious. I have the board with the female micro-USB socket on it. I’ve used two different cables, one stolen from an external HDD I have, which spins up when using both cables. No LEDs light …

As I wrote before, I had experienced “Gateware version mismatch” errors. Please see the following screenshot.

 ![LimeSDR_gateware_mismatch](https://canada1.discourse-cdn.com/flex034/uploads/myriadrf/original/2X/5/55836dffa314a4daf2e1e2405924c1ad75e65cb3.png)  
The firmware was updated using LimeUtil as described in quick start guide and returned no errors. No settings were modified in Lime Suite GUI. Maybe these errors caused the power circuit failure?

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