My arduino mega wont power on through usb, nor will it connect to the computer. It wont turn on when through USB. If i used the power supply port it turns on. The USB port on the board gets read hot.
How screwed is it?
The connector gets hot? Or the chip next to it? Either way, sounds like something has failed and needs replacing.
Without you telling us WHAT was connected to it and HOW with a schematic there is not much anyone can tell you other than what you have said.
I would like you to READ THIS and come back to add all the details you missed.
Best guess from the limited info is "yes it sounds broken"
Nothing is connected and its the USB port which is getting hot
What "WAS" connected to the board ?
I have a decent collection of test boards here and none of them have failed in that way when just connected to a USB port.
Use a meter and check if either side of F1, the big green or gold fuse part, is shorted to Gnd.
You can see it on the schematic, connected to Pin 1 of the USB connector.
arduino-mega2560_R3-sch.pdf (47.1 KB)
Guys, we're getting out into the weeds here. The board is damaged. Discard and replace.
Repair is not practical - considering the low cost of Mega clones, and the time it would take to determine exactly what has failed and replace it (which would also require access to hot air rework facilities) makes repair untenable, even if you value your time at minimum wage. There may well be multiple damaged components on the board, too. You probably did something to abuse the power rails, which often takes out the 16u2 (sounds like it's done that) and often takes out other pieces of the power circuit as well.
I found the problem, a bit wire had gotten stuck between the connectors of the USB port underneath the arduino. I presume it was causing a short. Removed the cable back to normal.
I didnt notice the cable until i took it out of my project box.
EndlessOyster:
I found the problem, a bit wire had gotten stuck between the connectors of the USB port underneath the arduino. I presume it was causing a short. Removed the cable back to normal.
I didnt notice the cable until i took it out of my project box.
Well, that is an unexpectedly pleasant resolution!