iPhone 5S water Damaged, Phone works, no LCD with Replace, Bad Chip?

I have a 5s a customer brought in w/ severe water damage to lcd flex area and no power. After I went through my usual regiment of solvents, the mobo is now clean(See before and after pics) and it powers on. Everything works except there is no image on LCD. I have tried the original, along with 2 brand new LCD's, but still no image. It may be the backlight, or whatever controls the LCD image. Anyone have a schematic and no which I should start with? Where can I get the chips? Thanx.