I'm not familiar with that particular printer, but there's bound to be an option to test the LCD panel for operational status. The web page shows that the product line is based on LCD masking. You can remove the print bed and vat and send a job file to the printer if there is no automated test option.

You should see the LCD illuminate from below with the UV LED array (with the cover in place) which will tell you that the active portion of the exposure system is or is not working.

Based on your description, it's probably going to remain dark and require appropriate troubleshooting from that reference.