Over time, heat dries out the large electrolytic capacitor, causing its Equivalent Series Resistance (ESR) to spike. This starves the main circuit under heavy loads.
When repairing an ADP-160ER without power output, focus diagnostics sequentially across the components listed in the technical schematic: Blown Blown MOSFETs and Capacitor Failure Adp-160er Schematic
However, I can give you a for how to approach reverse-engineering or troubleshooting a similar power supply unit (PSU), plus steps to locate official documentation. Over time, heat dries out the large electrolytic