Wow, I didn't mean to start an argument here.
I have connected it to a computer and it made no difference, as I mentioned though the user interface relies on the OSD and I never saw this monitor in a working state so I can't tell what input is selected and whatnot. I can randomly stab buttons and hope for the best but even the buttons are unlabeled. Either way something is clearly broken.
The T-con board is trivial to replace, it's held in by a few screws, two big FPC cables to the panel and two LVDS cables to the interface board. I have checked voltages and didn't find anything unreasonable however without any service literature I can only speculate. I did find a datasheet for the panel but I don't have any reasonable way of capturing the signals from the LVDS interface to analyze them in any meaningful way. Since the T-con board is considered part of the panel assembly the datasheet doesn't even describe precisely what it does.
I may have to just replace the T-con board and see if that fixes it, I hate to buy parts and then find out the problem is something else. Most sellers won't take returns on something like that for obvious reasons, too many unscrupulous people who will try to return the defective one or damage the new one and then send it back as defective. My whole group was laid off recently so I've postponed any non-essential expenses for the time being.