inverter issues somone please help...?

A fuse doesn't blow for no reason. Some component failed in the inverter, and that is why the voltage is high.

For the other, it appears it is dead, something failed.. but can't tell from here.

Those are switching power supplies. Overload could kill some parts inside even it has so called short circuit protection. Especially those cheap made unit using cheap parts and poor assembly. I spent two weeks to repair one my computer power supply because it turned into smoke in front of me. It has so many damaged parts after I trouble shoot it for weeks. Finally I fixed it but I spent on parts cost close to the same unit price. If you like to repair it as your electronic training skill,open it to see any burnt parts first. Second, go to website get the circuit diagram or some thing close to it. Or locate the main control IC (phase lock loop IC ) , mark down the name of IC then search this parts related circuit. And then read those circuits until you fully understand it. Then go back to your defective unit to figure out how it works and what might be the possible failure. Take the parts out and test them. If you found some bad one, replace them and test again.