I think I also have a SI-727R-DS.
So if it has isolation built-in that means it just plugs into an outlet like a TV, correct? I think I have one in my dedicated Captain Commando cab I just got. Will running power to it from the iso transformer in the cab harm the monitor? I turn it on and it makes a high frequency sound. Also smell something burning, but no smoke. The power cord on the monitor has been cut and connected to the molex connector from the iso in the cab.