Converts AC input into high-voltage DC (around +400V). Key components here include the bridge rectifier and the main filter capacitor.
Centred around the FAN6300 controller IC (U1) and a MOSFET (Q13), this section "switches" the DC voltage at high frequencies through the TR1 and TR2 transformers to step it down. 17ips62 schematic diagram
Includes line filters (LF2, LF4) and fuses (FS1, FS2) to protect the board from power surges and prevent electrical noise from leaking back into the mains. Converts AC input into high-voltage DC (around +400V)