Schematics typically show a 12V input stage, buck converters for 5V, 3.3V, and 1.2V (core voltage), and specific LVDS output pins.
Supply voltage for the panel (VCC_PANEL). This is selected by JP1 . t.vst59.031 schematic diagram
Firmware is usually loaded via the USB port. Format a USB drive to FAT32, copy the .bin file to the root directory, and power on the board. Schematics typically show a 12V input stage, buck