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Topic: Mega2560 board, IC7 gets very hot? (Read 8016 times) previous topic - next topic


Hello all!
I haven't been able to participate on this for a while.
First of all, board has been powered mostly from USB, sometimes with a lab power supply, which has a variable voltage, but I've been using it with 12V.
I found the schematic for the board(on the product page, what a surprise  :smiley-roll: ), and have been doing some trouble shooting with it, and it looks like the IC7 just has gone bad for some reason. The FET it drives is ok and working fine, and the resistor and LED are fine ok, led lights up when driven externally. The 3.3V regulator is also working as expected, which really shouldn't be an issue, because it's behind the FET but checked it anyways.
For now, I just removed the IC7 from the board, and have to live without that 3.3V when on USB power. Maybe I'll get a replacement IC for it later.



Apparently i have done the same mistake with UNO Rev3. Powered through USB port and gave 5v input in Vin simultaneously.
Now the op amp VCC and Ground pins are shorted.
I could not upload any code and the led connected to pin13 is always on.

Is there anyway i can make my UNO work? Would it be fine if i just replace the component.

Any comments would be helpful.

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