Powers on, audio on, back light on, but no picture at all. I replaced the main board. Still didn't fix the issue. I originally thought it would be the T-con board. But this tv apparently does not have a T-Con board. Does anyone have any answers? It's a 2year old tv!! 4k!!!
There is a T'Con board. Without it, no LCD display will go on. It is a built in unit in its display. It cannot be replaced at all. If you wish to get some details; check the sites linked here.
https://elektrotricks.blogspot.com/
https://electronicshelponline.blogspot.com/
Faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault. Search the site by type in the Brand Name of your set, in its search bar at the right side column, and press enter. See it in by Webview with mobile or by desktop. Mobile View has no search box. Screen-shots to defective LCD panels are given. You can see and compare to that to your TVs', and can make sure about the fault to an extent.
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