Sphere not powering on

Question

I had been going through this sample https://www.element14.com/community/groups/internet-of-things/blog/2019/08/01/azure-sphere-starter-kit-advanced-tutorial

Everything worked in the end. let the device on all night, sending data to IoT Central successfully. I wanted to debug/understand why temperature readings on both sensors were around 34 degrees while I was expecting 20-25.

So I did some visual studio debugging, couldn't really find any issues, the calculation matches the sensor specs. Stopped debugging and as I recall, all leds on the device went dead. Been trying to plug it in/out a few times and once the led came up but went dead shortly after.

Any tips or tricks? As it seems the device is not powering on so the ports in windows aren't appearing either.

peterfenn · Answer

Thomas

To eliminate the computer for a moment from your debugging, try plugging-in a regular +5V phone charger (ie. one with a microUSB connector)

If the green Power LED does not illuminate, I'd suspect a possible hardware fault with the DC/DC regulator on your board

More likely though, is your USB cable. The power management circuitry on the Starter Kit includes under-voltage detection

A marginal USB power connection can cause an excessive voltage drop that will result in no 3V3 output, and that LED not being illuminated

PS: The full schematic is available for you to download at:
AES-MS-MT3620-SK-G_SCH_2019-07-03

-Peter

peterfenn · Answer

Thomas Are you saying that the green power LED is also off? I'd suggest close Visual Studio for now, and do a quick check of the status of your starter kit, as follows: 1) Check that the VBAT jumper is still in place on J9 pins 1 and 2 !!! J9 is located in center of the board, see the yellow box in the image below... 2) Do the relevant ports show-up in Windows Device Manager when you connect the board to your development PC? (ie. three COM ports plus TAP-V9 virtual ethernet adapter) - a simplified view shown here... 3) What is the board's status from the azsphere command-line interface? Enter the following commands: azsphere device show-attached azsphere device capability show-attached The "Enable App Development" capability should list in response to this command... If this capability is not listed (typically as result of the Sphere OS having updated), re-enter the prep-debug command: azsphere device prep-debug -Peter

peterfenn · Answer

PS: Review again the checklist at the " Troubleshooting installation and setup " page: https://docs.microsoft.com/en-us/azure-sphere/install/troubleshoot-installation

peterfenn · Answer

Check the VBAT jumper is in place on J9 pins 1 and 2 ( J9 is located in center of the board)

mvp · Answer

This is an old issue, which was solved. See : Azure Sphere starting kit stopped working and https://www.hackster.io/contests/SecureEverything/discussion/posts/5218 I guess you can alternatively ask for a replacement board, but this choice requires some time. Hope the mentioned solution will help you also. Peter Fenn already informed the manufacturers about this issue!

Sphere not powering on

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