I have redone the solder connections on the board (I bought better solder and put the iron at a higher temperature). You can see what it looks like now: imgur.com/a/7VWUD. One thing I still don’t know how to do is fix the solder bridges between the components (I have circled the area I am talking about with red circles). How can I go about fixing them?
Also, now when I plug in the board it makes a noise that gets high pitch, then goes down to a low pitch hum, and then just crackles. I have attached a video to show: vid.me/Pzcc . Interestingly enough if I unplug it and replug it back in immediately I only get the crackle noises, but if I wait 10 or so minutes and plug it back in I will get the high and low pitch hum again. My guess is this has something to do with a capacitor.
How can I go about fixing this?