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troubleshooting no boot
2019 年 02 月 26 日
New Member
Forum Posts: 1
Member Since:
2017 年 01 月 17 日

Ive been using the 86duino as a car pc that plays MP3s for serveral years. It recently stopped working and would not boot and display anything out of the serial port.

I bought a new one and it worked for a while but eventually had the same problem. I noticed the 12v to 5v converter in the car is only outputting 3V and has to be the original cause of the problem. But when plugging it to a PC usb port it still doesnt display anything on the serial port. I verified the PC usb port is outputting 5v and it worked correctly when I tested the new one. Both the green and red internal lights are working.

I took the reflash boot image that makes the LED blink slow fast slow and it does indeed make the LED flash in the correct order. But there is still no communication with the serial port.

Is there some places to start troubleshooting what exactly is wrong with it? Could I send it back for repair?

2019 年 08 月 20 日
Forum Posts: 228
Member Since:
2014 年 04 月 01 日

Hi, pinchy,

From your post, i think your board is 86Duino One, it need to work under enough voltage and current.
The voltage of PC's USB should be 5V, it is no problem, but the current is not likely.

The below picture is the result of my USB Detector for 86Duino One:

The electric current is 0.512A when 86Duino One is working.
The 0.512A is over the max current of USB 2.0 (max. 0.5A) on PC.
Maybe you should try USB 3.0, it max current is 900mA.

If we have only USB2.0, there are two steps to work for 86Duino One via USB2.0:
1. Use the terminal block, input 6V~24V to 86Duino first.
(Find the terminal block from
2. Plug the USB cable in 86Duino and the USB2.0 port on PC.

After the above, you should see the 86Duino serial port appears in device manager.
Then try to upload any program to 86Duino.


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