XU4 solid red light after a power outage

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Mims
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XU4 solid red light after a power outage

Unread post by Mims » Sun Aug 12, 2018 10:56 pm

Hello,

My XU4 was shut down unexpectedly during a power outage. I reboot it but only the red light was on, solid red light. I thought it was due to a corrupted eMMc. I burned a brand new image of Dietpi on my eMMc but no success.
Even the fan does not turn on.

Is my XU4 dead or something?


Thank you for your help

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Re: XU4 solid red light after a power outage

Unread post by mad_ady » Mon Aug 13, 2018 12:00 am

You'll need to check that the power supply outputs stable 5V. Also check that the boot switch is in the emmc position. Optionally try with a sd.

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Re: XU4 solid red light after a power outage

Unread post by odroid » Mon Aug 13, 2018 10:55 am

It is very worth to try the eMMC recovery process first.
viewtopic.php?f=53&t=6173

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Re: XU4 solid red light after a power outage

Unread post by Mims » Fri Aug 17, 2018 12:53 am

Power supply provides stable 5.24V.

I followed the steps but unfortunately the red light is solid on and nothing happens :/

Would a UART kit be useful?

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Re: XU4 solid red light after a power outage

Unread post by odroid » Fri Aug 17, 2018 9:05 am

If the recovery(Android image) didn't boot from SD card, your board seemed to be damaged by unknown electrical shock. :(
In that case, the UART kit is not useful.

Did you check the slide switch position carefully?

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Re: XU4 solid red light after a power outage

Unread post by Mims » Fri Aug 17, 2018 2:35 pm

I did :)

There is no way to know what might be the faulty part?

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Re: XU4 solid red light after a power outage

Unread post by mad_ady » Fri Aug 17, 2018 3:53 pm

It is possible that the PMIC has been damaged. You can try to power the board by supplying 5V and GND via the GPIO pins from a stable power supply. Make sure not to short anything, since there is no protection. There's also a wiki page for bypassing the PMIC.

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Re: XU4 solid red light after a power outage

Unread post by Mims » Fri Aug 17, 2018 11:17 pm


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Re: XU4 solid red light after a power outage

Unread post by mad_ady » Sat Aug 18, 2018 1:20 am

Yes. You should try that if it starts via the gpio pins. If it doesn't start, bypassing the pmic may have no effect and the soc may be fried...

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Re: XU4 solid red light after a power outage

Unread post by Mims » Sat Aug 18, 2018 5:18 am

Thank you :)

Unfortunately, nothing worked...

I guess I Will just have to buy a new one.

What can I do to avoid such incident in the future?

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Re: XU4 solid red light after a power outage

Unread post by mad_ady » Sat Aug 18, 2018 1:21 pm

I'd say you may need some sort of UPS or surge protector if it was just a power glitch. It it's weather related (lightning struck power lines) you may get burned by induced overvoltages on the ethernet cable/hdmi port.

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Re: XU4 solid red light after a power outage

Unread post by rooted » Sat Aug 18, 2018 1:45 pm

Yes it seems the XU4 is a bit sensitive to power fluctuation, I lost the network on one of my XU4 after lightning struck a transformer near my house and the power went down.

Luckily it still works with a USB network adapter.

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Re: XU4 solid red light after a power outage

Unread post by mad_ady » Sat Aug 18, 2018 2:18 pm

@rooted: any idea if there are surge protectors for ethernet?

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Re: XU4 solid red light after a power outage

Unread post by rooted » Sun Aug 19, 2018 12:17 am

mad_ady wrote:@rooted: any idea if there are surge protectors for ethernet?
Yep

https://www.bestbuy.com/site/apc-surgea ... Id=9810046

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Re: XU4 solid red light after a power outage

Unread post by Mims » Sun Aug 26, 2018 3:51 am

Thank you for your help. I bought a new one.

Do you know if UPS have surge protecfion by default?
Does a surge protection need to be on the XU4 or can it be on the power outlet?

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Re: XU4 solid red light after a power outage

Unread post by rooted » Sun Aug 26, 2018 4:41 am

Mims wrote:Thank you for your help. I bought a new one.

Do you know if UPS have surge protecfion by default?
Does a surge protection need to be on the XU4 or can it be on the power outlet?
I think it varies, but there old ones I have lying around the house do.

I would plug the XU4 power cable directly into the UPS.

You definitely want to protect the network cable also, I have seen a few people (myself included) lose the network from known/unknown shock.

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Re: XU4 solid red light after a power outage

Unread post by Mims » Sun Aug 26, 2018 6:56 pm

UPS -> multi-socket + rj11 -> any devices

Would it work?

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Re: XU4 solid red light after a power outage

Unread post by rooted » Mon Aug 27, 2018 11:14 am

Mims wrote:UPS -> multi-socket + rj11 -> any devices

Would it work?
I don't know. UPS have more than one plug, why use a surge protector strip instead of the plugs on the UPS?

Don't you mean rj45?

*edit*
You have DSL I guess, if that's the case then yes on the rj11.

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Re: XU4 solid red light after a power outage

Unread post by rooted » Mon Aug 27, 2018 11:23 am

Something like this is perfect if you have DSL based internet. (inexpensive also)

https://www.bestbuy.com/site/cyberpower ... Id=3938808

If you live outside the US you can find something comparable I'm sure.

You could plug your modem + rj11, router, XU4 and still have a free battery backup plug available.

Plus it has four protected plugs on the other side.

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