XU4 died?

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knight
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XU4 died?

Unread post by knight » Mon Feb 11, 2019 12:29 am

I think one of my XU4's may have died.
Previously it was running Android 7 from emmc quite well. However, one day I turn it on and it no longer boots.

The symptoms include:
- Fan immediately goes full speed
- blue light does not stay on nor does it blink even once
- red light on solid
- ethernet link & activity lights are on
- no output at all from the serial console
- voltmeter shows 5.2 volts going to the XU4 while powered on

To troubleshoot this further, I have written a fresh Armbian image to sd card, removed the emmc, remembered to toggle the swtich emmc -> sd, and tried to boot. The symptoms remain the same.

Anyone got any additional ideas to troubleshoot this?

It seems odd how this device could fail. This particular XU4 is only a couple years old, and it only got used 2-3 days out of the week.

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rooted
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Re: XU4 died?

Unread post by rooted » Mon Feb 11, 2019 12:44 am

Try a different power supply. Although the symptoms say it's likely a bad OS I believe.

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Re: XU4 died?

Unread post by odroid » Mon Feb 11, 2019 11:46 am

Did you measure the voltage on 30pin header header 5V rail?
https://wiki.odroid.com/odroid-xu4/hard ... connectors

Can you flash our official Ubuntu image with Etcher?
ubuntu-18.04.1-4.14-mate-odroid-xu4-20181203.img.xz

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Re: XU4 died?

Unread post by knight » Sat Feb 16, 2019 8:07 am

Sorry for the late reply. Been tied up with other priorities.

So here is what I tried:
I borrowed a power supply from a different, working XU4 but the suspect XU4 showed the same behavior

I downloaded ubuntu-18.04.1-4.14-mate-odroid-xu4-20181203.img.xz from here:
https://odroid.in/ubuntu_18.04lts/

I wrote that image to a fairly new 32gb samsung evo sd card using Etcher. The micro switch was verified to be in the sd card position, but the device still does not boot.

Previously, I measured the voltage from the underside of the barrel connector, on the pc board. This time I measured the voltage directly from pin 1 of the 30 pin header. The measured voltage was 5.13v.

This is the first XU4 I bought, and at the time I bought it, I had upgraded the heatsink to one of these:
https://ameridroid.com/products/heat-sink-40x38x36-gold

I noticed that physically touching the heatink during operation could often cause the device to lockup. Who knows. Maybe I put too much heat sink grease on it. Perhaps the grease is touching something it should not.Time permitting, I will remove the heatsink, clean all the heatsink grease off it, then try again.

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Re: XU4 died?

Unread post by odroid » Sat Feb 16, 2019 11:12 am

We've used this Germany thermal paste SG502 which has 1.1E+15 ohms/cm. It is a near electrically non-conductive material. So it couldn't damage your board probably.
https://www.acc-silicones.com/content/p ... sg502.ashx

If you used a different thermal paste while you replace the heatsink, you need to check the characteristics of your thermal paste.
We saw some thermal interface materials have very low resistance and it could cause electrical damages to the board.

Anyway, remove the heatsink and clean the board surface carefully.
And test your board without heatsink.

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