Arduino uno board LED Malfunction???

Other Hardware LEDs and Multiplexing
1

Hello!

I have got a Arduino Uno board. But when I turn it on, the "L" Led on the board itself is weakly flashing and eventually doesn't flash at all.

Is this a board malfucntion, Overvoltage/heating or is the board broken?

Thanks in advance!

kind regards,
-Goldfile

2

The L led indicates that there is no activity, when you upload a piece of coding it starts to flash along with the TX and RX led. I have the same thing and mine works 100%. There is no malfunction at all, so you have no worries about it.

3

Have you written code to flash this LED ? If so don't forget to use pinMode to set it to an output.

4

Hello!
Thanks guys, Now I don't have to worry about my board anymore hahaha.
Anyway, I have recently got another problem with my 5v input pin, Where i would connect everything as should and shown. but when I plug in the 5v pin, the board would turn off, when I raised the pin out it would turn on again??

thanks for your replies!!

Kind regards,
-goldfile

5

What are you plugging into the 5V pin?

6

helo CrossRoads,
I plugged in the vcc in 5v, and everything is correctly plugged in elsewhere.
thanks for your reply

kind regards,
-Goldfile

7

Goldfile:
Hello!
Thanks guys, Now I don't have to worry about my board anymore hahaha.
Anyway, I have recently got another problem with my 5v input pin, Where i would connect everything as should and shown. but when I plug in the 5v pin, the board would turn off, when I raised the pin out it would turn on again??

You are going to have to be a lot more specific with this. You appear to say that when you put 5V into the 5V pin everything turns off and when you remove the 5V then magically everything works despite you having no power to the board.
If this is so you have invented power from nowhere.
As I suspect this is not the case cany you specify exactly what is happening please.

8

sure,
I have an LCD LCM1602 IIC V1.
when i connect the Vcc pin to the 5v pin, and everything else is plugged properly, the arduino just in a blink of a second, shuts down, instantly and when i remove the pin from the arduino, it turns off instantly again.

kind regards,
-Goldfile

9

That sounds like you are shorting out the power supply.
It is down to wiring it up to the wrong pins or the LCD is faulty. Make sure you have the connections right and make sure there is a current limiting resistor in the back light, if it has one.