The 30-pin or 40-pin connector that sends video signals to the LCD panel. Warning: You must set the panel voltage jumper (typically 3.3V, 5V, or 12V) correctly before powering on, or you may destroy the panel.
This is the connection point to your screen. The schematic details the pinout for the 30-pin or 40-pin LVDS header. t.vst59.031 schematic diagram