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All was working fine till I left my Pi 3 b+ board turned on for around 4-5 days along side windows on my monitor.

Now, when I connect power to it, only red power led glows constant red. Yellow led doesn't glow and the board refuse to boot. I freshly installed Raspbian Buster but it didn't change anything.

Then I used a usb drive for booting just in case my memory card is corrupted(installed Raspbian buster on usb drive), but still nothing good(I didn't change OTP as I am using Pi 3 b+ here). So, clearly corrupted memory card is not the problem here.

I then used my multimeter to check continuity and voltage, to check if led was broken or USBs don't work, but still everything is continuous and all USBs are working fine. Power supply is legit too.

I don't think that the board is defective as I didn't tweaked anything and even multimeter shows some areas(where I tested) are working fine.

Can anyone suggest the solution to this or any troubleshooting options?

UPDATE I will keep my PI in freezer for some days just to try it for a last time. I will get back to the solution then(if any).

  • I'm not sure, but I don't think "buster" can boot from USB - I know it won't on pi4 (yet) - have you tried a different SDcard instead? or perhaps stretch on the USB – Jaromanda X Jul 16 '19 at 2:18
  • I tried stretch on USB but still it doesn't work. I am going to use another SDcard just to check if card is corrupted or not. I will come back later after that. – K_lash96 Jul 16 '19 at 5:52
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    Possible duplicate of Raspberry Pi 3b+ not booting. Also read the The Boot Problems Sticky. – Ingo Jul 16 '19 at 10:59
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    If you have found the reason or a solution, so please make an answer to finish the question and show others that is has a solution. – Ingo Jul 16 '19 at 22:44
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    "I think I shorted 3V3 with 5V" - This is more relevant for diagnosing a non-working board than the question itself. – Dmitry Grigoryev Jul 18 '19 at 7:24
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*Update:

I tried cooling my Pi but the same thing appears - only red block glowing pwr led. So, I bought a new Pi 3 b+ and it is working ok.

Power supply was not the issue. As I commented earlier, I might have shorted the 5V and 3V3 that seems to be the issue.

Anyways I would be closing this question as solved.

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