Hi guys,
i have nodemcu 1.0 board, when i connect it to laptop through USB i got windoes message device not recognized....when i put other nodemcu board, everything is working fine....this way i excluded driver problem...
how to repair nodemcu who is reacting on reset, i see led diode blinked once reset button is pressed....is there any help how to repair, solve problem
First confirm that they have the same USB/serial chip (usually CP2101 or 02)
they have the same chip, CH340G
Maybe the CH340 may have failed.
You could check with a magnifying glass if there is something wrong with the soldering of the USB connector.
Already checked visually everything.... And see nothing strange... Some tests could solve problem... But I do not know how to rest it... Is there any other way to try ro upload code instead of using USB
You can use external USB to TTL converter, you might have one if you have been using any boards without USB.
hey @kmin again you 
man i have this board and i need it...i have no TTL converter....how can i fix board, do you have any tutorial or knowledge how to test it, how to fitgure it out where is the problem..
Nothing genius comes to my mind, your description smells like hardware problem with CH340. Many years I haven't been playing with esp8266, but as far as I remember you can program them with arduino board as well. If you have one, make some search online for tutorial.
Hi @neznamnista.
One of the possible causes of this problem is a short circuit or problem with external circuitry connected to the Arduino board.
Make sure the board is not sitting on anything conductive that could short the contacts on the bottom of the board. Make sure there isn't any conductive debris (e.g., strands of wire or component leads) on the board or on the surface the board is sitting on.
If you have a shield or any external circuitry or components connected to your Arduino board, try this experiment:
- Disconnect the USB cable of the Arduino board from your computer.
- Disconnect any shields, modules, external circuitry, etc. from your board.
- Connect the Arduino board to your computer with a USB cable.
Now check to see whether Windows is now able to correctly recognize the board. If it does, you know the problem was caused by the external circuitry. You can then focus your attention on identifying the specific problem with the circuit and resolving it.
It's not anything similar... Windows is able to connect all other boards from Uno to node but this one is making problem and I want to solve it.....if I am able to use it I will use it but I thought it is possible to determine problem with some tests... But as I see now no tests like that
I provided one such test in my previous reply. Please perform the test and then add a reply here on the forum thread to tell us the result.
I found TTL adapter and connected to broken NODEMCU using rx/tx pins....and it started to upload but suddenly stopped...what does it mean, which part is broken?
here it is how it looks on SM:
══ IROM 272448 code in flash
esptool.py v3.0
Serial port COM9
Connecting........___
Chip is ESP8266EX
Features: WiFi
Crystal is 26MHz
MAC: 44:17:93:11:31:b9
Uploading stub...
Running stub...
Stub running...
Configuring flash size...
Auto-detected Flash size: 4MB
Compressed 310704 bytes to 226265...
Writing at 0x00000000... (7 %)
Writing at 0x00004000... (14 %)
A fatal esptool.py error occurred: Failed to write compressed data to flash after seq 1 (result was C100)
This error might be caused by the communication lines between the computer and the microcontroller on the board not being able to support the rather high default upload speed. If so, the problem should be fixed by reducing the upload speed, which is configurable via a convenient menu.
Select Tools > Upload Speed > 57600 from the Arduino IDE menus and then try uploading the sketch again, just as you did before. Hopefully this time the upload will be successful.
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