The primary input from the power supply section. 5V Standby: Generated for the processor and USB ports. 3.3V VCC: Powers the main SoC and memory chips. 1.2V/1.8V Core: Essential for the MStar processor logic.
Crucial for setting the panel voltage (typically 3.3V, 5V, or 12V) to match the specific LCD panel being used. T.sk105a.03 Schematic Diagram