Lol, as I read this, I find myself excited. It is "Something." Words of wisdom; low heat, little time...flux is your friend, multimeter is very useful (necessity), and a magnifying glass will reveal a LOT. Beware of moving anything, beware of where you set your work down (or mount), and follow the "path." Glad somebody fixed their issue. Tiny bits of solder in the area you are working with will usually be the culprit unless you "lift" another part. ANOTHER idea; splatters. Sometimes you might think all is well, go to move your soldering iron, and then a little bit splats somewhere. A SLIVER, smallest amount, will give you goofy errors. This is awesome work guys. Sharing is caring, good hunting;-)
Edit: don't be too proud or impatient to go over your pcb and literally go systematically over it with the magnifying glass. There are different types/sizes. Have fun, and 99% is repairable if you do make a mistake. ALSO, those are some TINY points. I HIGHLY recommend taking some old pcb (from a dvd drive that is broken, or other electronic device that is broken) and practice. OR, find a friend or somebody who is experienced. I can always see it, "Can this be fixed?" threads/posts on here with pictures of burns, lifted components, solder covering multiple components, etc. Be smart, NOT impatient.
Edit: don't be too proud or impatient to go over your pcb and literally go systematically over it with the magnifying glass. There are different types/sizes. Have fun, and 99% is repairable if you do make a mistake. ALSO, those are some TINY points. I HIGHLY recommend taking some old pcb (from a dvd drive that is broken, or other electronic device that is broken) and practice. OR, find a friend or somebody who is experienced. I can always see it, "Can this be fixed?" threads/posts on here with pictures of burns, lifted components, solder covering multiple components, etc. Be smart, NOT impatient.