ESP8266 nodeMCUv2 fails to switch on, create issues with USB - Hardware issue

Other Hardware 3rd Party Boards
1

Hi,
In August 2022 I bought 3 x ESP8266 nodeMCUv2 (AZDelivery)

I programmed them, no problem

About a month ago, one of them didn't switch on any more (LED_BUITIN does not flash any more), USB connected to the ArduinoIDE it claim there was no USB connection.
OK I didn't understand what happen, I put it in drawer, and continued with the two other ones.

Today "the same" thing about with another one !
Prior to do that, I recognized the same "symptoms":
1/ I was reading ds18b20(also by AZDelivery) and gradually it looks like that the temperature indication was not "stable" and decaying, what was read 16.7 seems to be about 1 degree more.

2/ I'm running Linux Manjaro XFCE 22.0.0(latest) - with latest Arduino IDE - by merely plugging the "defectuous" nodeMCUv2, I loose access to my USB port ! I tried to logged off, it didn't restore it, plain hard shut down.
I tried a 2 or 3 times, same behaviour, so it is consistent.

A few time prior to the described issue, I also notice occasional failures to upload, I presume a flash memory issue.

So on the count on three, on remains OK. Are the two to throw to the bin, after only less than 6 months???

Does any one have encounter such issue?
Recommendations?

Thanks

2

Espressif site has diagnostic and firmware upload tools for the ESP8266.

When you were uploading, did you place the board in upload mode manually using the on board button sequence?

Also, have you tried uploading using a different computer?

3

Espressif site has diagnostic and firmware upload tools for the ESP8266

Do you mean this: GitHub - espressif/esp-insights: ESP Insights: A remote diagnostics/observability framework for connected devices ?

When you were uploading, did you place the board in upload mode manually using the on board button sequence?
If you ask if I was pressing on flash button at the right of USB port, answer = no.

It gave me the idea, that it might be possible to wipe out the bin code and have a factory reset, so powered by an usb charger, I pressed for more than 10sec the flash button, I also tried to press together the boot, to no avail.

And because I plugged the usb cable into my PC, again I lost the access to the usb port => restart.

4

Absolutely no. I haven't looked for it lately, but it would be located with all the other utility programs. They all connect to an ESP locally, no network stuff, using serial connection.

5

Then this maybe? Tools | Espressif Systems

But so far no USB connection for me

6

Which utility did you use to test the USB connection? I'm talking about re-flashing the factory firmware (also available on that site).

7

Which utility did you use to fix the USB connection? I'm talking about re-flashing the factory firmware.
??don't understand.
I have an usb keyboard, so I know when I plugging the nodeMCU, I'm loosing keyboard...

8

I don't understand your crazy statement about your keyboard. Struggling to understand why your keyboard would have anything to do with this.

My suggestion:

Use the ESP utilities to re-install the factory firmware.

Thought... do you know what firmware is?...

9

Which ones?

Struggling to understand why your keyboard would have anything to do with this.

Well, I soon as link the PC with nodeMCUv2 by means of USB cable, I'm losing access to USB.
Why I don't understand either, I just observe the fact.

10

You mean, it kills all the USB devices on your PC? If so, the ESP may be shorting USBVCC to ground on board.

What projects did you use it for, before it started doing that? You may have blown the hardware with bad wiring or design.

11

You may have blown the hardware with bad wiring or design.
I believe you're right. I'll investigate as of Friday.

Thx already.

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