My assumption is that it bricked the PSU which caused other hashboards to not work as well. I would like input from others about this assumption.
Discoloration on one of chips (in middle of picture) means that it probably burnt. How or why I am not sure. What that one does I am also not sure. It's name is "copper_26". I'd appreciate if someone more tech-savy with Antminers could tell us what that chip is used for and why might it have burned?
I don't think those are chips,
I think it is literally just a piece of copper. Possibly used to increase the current capacity of the signal. Can't really tell from your photo if it is just oxidation or scorch marks.
That is my guess as well - they are simply thick copper busbars soldered onto the power planes in the PCB in that area and are used to increase the current capacity of the power planes. Only way to tell would be to check the resistance between some of them - if they are all soldered to the power planes it should be very close to zero. While that suspect bar looks funky, to me it does not suggest overheating - more like simple oxidation.
Tip when checking low resistances: First press the meter probes together to establish the resistance of the meter leads. Most of the time it will be around 0.1 ohms. If the meter has a zeroing function, use it otherwise just subtract the meter lead resistance from what you measure across the bars to get the true value.