Well, your slides operate on voltage from your COACH battery, which is, of course, kept charged by your Converter. It sounds like your battery has been discharged and your Converter may or may not be damaged.
From what you describe the circuit board, I would suspect that you need to replace it first, then recharge the battery with a portable battery charger and then see what is functioning before you replace the Converter.
If you are going to use a portable generator in the future then you must make sure you are wiring it properly to your RV. A lot of people do not and they get this kind of problems.