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I have 3 Raspberries set up in cases with holes in them. Each Raspberry has a microcontroller and a wireless adapter attached via USB. Two Raspberries have been working fine for 5 months now. However, one setup fails constantly.

I replaced the faulty raspberry with a new one because I didn't have the time to check why it was failing. It just didn't boot, only the red LED was active.

I thought it could be the fuse and just replaced it with a new one. After a few days I got the faulty one booting again, after flashing a new image to the SD card. This didn't last long, though. After a few minutes, I couldn't reboot anymore, same situation - red LED only.

Today, the setup failed with the new Raspberry after 20 days and I think it's the same error. The Raspberries get quite warm - about 55°C, maybe a little more. The wireless adapter seems to produce a lot of heat as well.

Besides that, all setups use the same hardware - because of that, I don't think that its the SD-Card model or any other component.

Why is this setup failing multiple times while the other setups run perfectly?

What do I have to check in order to identify the source of the problem?

Any ideas are highly appreciated.

EDIT: I have to add that all those Raspberries are never shut down. They run like 20 hours until they literally get powered off, until they get powered on again after about 7 hours.

techraf
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s1ck
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2 Answers2

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if you have three identical setups, you may easily swap parts one by one to find the faulty one, start from the power supply, then goes the wireless adapter, then other externally-connected devices, then SD cards, and finally if the problem still persists, you'd better check the back side of your boards to find out the revision and production date and see if there's any difference there.

lenik
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Frequently a power supply problem. Try one amp PS.

user19614
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