Question Vizio 70” TVs dark screen

Jan 28, 2020
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I have a 70” Vizio e701i-a3
It had backlight no picture I replaced tcon board and it worked perfectly for a couple minutes then slowly faded to black.
I saw on a forum that there were some bad tcon boards out there so I ordered a new tcon board and the tv came on stayed on too except now there is a dark area on the bottom two thirds of the tv.
I was wondering if it is a lvds ribbon? Or something else?
Any ideas
TIA
Ed
 
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