A20112 Power Supply Schematic [ EXTENDED – Fix ]

AC Live --- Fuse --- EMI Choke --- Bridge Diode (+) --- Bulk Cap (+) --- Transformer Primary (Pin 1) | | GND MOSFET (Drain) | Source --- Current Sense Resistor --- GND Primary | PWM Controller (CS pin) On the secondary side:

Introduction If you’ve landed on this article, you are likely holding a faulty A20112 power supply or trying to integrate one into a custom project. Common in industrial displays, all-in-one computers, and medical cart monitors, the A20112 (often associated with brands like Delta, Lite-On, or Amigo) is a compact, high-efficiency switching power supply. Unfortunately, manufacturers rarely publish official schematics for OEM parts. a20112 power supply schematic

Repair safely – always discharge the bulk capacitor (310V DC) with a 10kΩ resistor before probing. AC Live --- Fuse --- EMI Choke ---

If you have a specific A20112 variant or an unusual failure, post clear photos of both sides of the PCB on electronics repair forums – with the knowledge from this guide, the community will help you map out the exact schematic. Repair safely – always discharge the bulk capacitor

Transformer Secondary (Pin 7) --- Schottky Diode (Anode) --- Cathode --- Inductor --- 12V Output (+) | Capacitor Bank --- GND Secondary The feedback path: