A20112 Power Supply Schematic ((new)) May 2026

Repair safely – always discharge the bulk capacitor (310V DC) with a 10kΩ resistor before probing.

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. a20112 power supply schematic

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. Repair safely – always discharge the bulk capacitor

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: Common in industrial displays

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