Hello, I will try to help you, if you have t-con with two flex to the display I suggest this practice
I will indicate a practice, always very carefully and fiddles with the unplugged TV
try disconnecting one of the two flexes that go from the t-con to the display and test if you have an image in the middle of the screen, if this does not happen connect it (eye, well connected) and disconnect the other and try again, if you see image in the middle of the screen is the bad display, I can indicate a practice to solve it in the best case
when I connect dvd to the TV if there is sound but with hdmi and vga not only with cable that has a lot of pins. source voltages are 23.6v and 3.2v what I need is to test signals. I tried the t-con with a lcd tool tester I do not know if you know it or not. And I get the colored bands with thin vertical stripes. And another thing when I turn off alone almost 20 minutes when plugging it with the button does not turn on it stays locked I have to remove cable and return to put it in. I don't have an oscilloscope to measure signals that very expensive. I'm going to mount a probe.