Electronics > Beginners

Pulling my hair out. Circuit boards stop working once shipped to client and more

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Psi:
Also its common for even genuine chips to come in a few different looking versions depending on the factory they were manufactured in.

OwO:
 :palm:
No triaging work has been done so far, and already starting to blame parts.
This is not how you do troubleshooting, you start from the symptoms and work backwards from there. The OP has not even said HOW the devices are malfunctioning.

Example troubleshooting steps:
Device not showing up on WiFi? => Attach the debugger and verify the MCU is running. MCU not running? => Attach debugger again and see where the execution is at, or even reset MCU from the debugger and step through the code. Debugger does not see MCU? Check all supply rails. Unsolder MCU, solder onto an arduino board to check if the MCU is functional.

NOT
Device not showing up on WiFi? => Is my LDO blown? Is my programmer broken? The MCU is counterfeit!

Please if you aren't going to actually troubleshoot it, at least describe the symptoms so we can have a better guess.

Jackster:
I am not blaming parts or anyone. Just pointing out something that looks odd to me. I am not making any presumptions here.
The text was barley visible when I got the tray.

mcinque:

--- Quote from: OwO on June 05, 2019, 12:25:58 pm --- :palm:
No triaging work has been done so far

--- End quote ---
I think it's correct, debugging is essential.
You must absolutely understand before WHERE the boards failed.
Only after discovering a problem you can solve it.

Jackster:
Just soldered on a new ATMega328p that I ordered last night.
Does not burn the boot loader.

Thinking the ATMega that I had already had a boot loader or by pure chance it burnt on that board.

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