I wasn't paying attention and grabbed the wrong power supply, 24v, from a box and plugged it into the DC barrel jack. It instantly fried the voltage regulator (AMS1117 5v) on my Uno R3 clone...No surprise there.
I removed the bad AMS1117 using a hot air gun and put on a new one. I then checked everything with a Multi-meter to make sure it was hooked up correctly.
Using the continuity setting, I got a positive continuity result between 5v and Gnd and between 5v and 3.3v.
Using the resistance measurement setting I got a result of about 34 Ohms between 5v and Gnd and about 23 Ohms between 5v and 3.3v.
None of those results are good.
I then took those same measurements on a completely working board: I got no continuity between 5v and Gnd an no continuity between 5v and 3.3v. For resistance I got about 3.1K Ohms between 5v and Gnd and about 2M Ohms between 5v and 3.3v.
I then removed the new AMS1117 that I put on but I still got the same bad results. I also removed the ATMega328P chip and still got the same bad results.
Obviously, I have some other component that is damaged but I'd rather not desolder every component randomly, one by one. I've looked over the board with a magnifying glass but I can't see any other noticeable signs of damage.
Does anyone have any guesses as to what other components could have been damaged or could the PCB traces have been damaged?