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Topic: Arduino Nano damaged. USB wont work. Power issues. (Read 1 time) previous topic - next topic


I just got my arduino nano V3.0 today. I also got an SD card reader and an LCD screen. I decided to connect a speaker to it and use the SD sound library to play music and display stuff on screen. I had it all working good and i was listening to some music when all of a sudden there was a crackle and then the music glitched a little. I then noticed a low hum in the background of the music that wasnt there before. The LCD screen was dim when i looked at it and the back light was flashing lightly. I looked back at my computer and saw "USB device not recognised." down the corner.

I reset the board using the reset button. The board's LED seemed to flicker for about 20 seconds before it started to display stuff on the screen like it was meant to. The board gets stuck with the LED flickering for upto 3 minutes so far. The speaker is quite, USB wont connect, display shows corrupt characters and the volt meter shows 3.1volts on the 5v pole and 3.0v on the 3.3v pole with nothing connected.

Is there any way to fix this? What is broken? What other information do you need?


How did you power it? Only the USB power ? That might be not enough.
How did you connect the speaker, directly to an output or with a resistor of 100...150 ohm.

Disconnect everything, and try to make the Arduino Nano run on its own.
You can use this sketch : http://playground.arduino.cc/Main/ShowInfo
If that is okay, connect the LCD and try that. If that is good, try adding the SD card module.

James C4S

Perhaps something shorted out.

Is there any way to fix this? What is broken? What other information do you need?

Schematic and links to the hardware you used.
Capacitor Expert By Day, Enginerd by night.  ||  Personal Blog: www.baldengineer.com  || Electronics Tutorials for Beginners:  www.addohms.com


I only used the usb power. The voltage readings are the same with the arduino unplugged from the project. The nano seems to be rebooting now. It plays about 1 second of sound and then the rx and tx lights flash even if its connected to a wall plug to usb adapter. Plugging the LCD into an external 3 battery (4.5v) power supply it works fine.


I just looked at it now and the device connects to the computer if i ground the reset pin. Im able to do a loop back test and i can see what im sending. As soon as i remove the jumper from reset to ground, the computer says usb device not recognised.

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