Well, if it's like the other controllers that "require" their LCD, some can be run "headless" by finding the two wires that act as "keyswitch".
In other controllers like my Fusin kit, which used a LiShui controller and I think a KingMeter LCD, there is a wire with battery voltage on it, and another wire with no voltage on it when the unit is "off" but after you engage power with the buttons connected to the LCD, the second wire then also has battery voltage on it, passing it back to the controller.
Since yours doesn't work you can't measure for this, but anyone with a working LCD would be able to do so.
Once you know which two wires they are, you can just connect them together, with or without the LCD attached at all, and the controller should operate at least in basic mode. It may only work at the firs tpower level if there are multiples, if those levels must be changed every time you power on.
Another way to find the wires may be to open the controller, and find the thin wire that goes from the input side of the low-voltage regulator to the connector on the LCD. That wire would be teh one that gets power from the LCD when the LCD is turned on (button push), and so would be the one you'd need to connect to battery power to turn it on.
https://endless-sphere.com/forums/viewt ... 66#p584366
has that info for my controller; the arrangement is likely similar for yours.