That PDF has a enhance web site for Roku.
I’ve discovered two pages that would possibly let you:
There could also be different pages in this web site extra related for your type.
In addition to that, there may be an professional Service Department Website, the place you’ll fill out a kind and publish to get enhance from a Service Technician. That web site is right here:
From what I will be able to inform from the more than a few paperwork I’ve learn, you might have put in some instrument for your pc, or the TV itself, that permits you to test your settings, and likewise replace the TV instrument. You might discover a atmosphere there that may assist.
Other than that you’re going to wish to ascertain your TV cable to Computer is hooked up to a supported port, that may deal with the enter/output you expect out of your Display.
Beyond this I’m out of concepts, however any person else in our Forum could also be extra acquainted with your form of TV and be capable to come up with extra technical recommendation.
Good good fortune resolving this factor.