Ps42419ha Schematic Top May 2026

80 PLUS certified, with a typical efficiency of 90.51% at 50% load. Schematic and Component Breakdown

The "schematic top" refers to the primary side components responsible for the initial AC-to-DC conversion and standby power generation.

The is a 240W 80 PLUS-compliant power supply unit (PSU) primarily found in HP Hewlett Packard small form factor (SFF) desktop computers. This switching power supply is known for its high efficiency (over 90% at typical loads) and custom compact layout. Technical Specifications and Architecture Rated Power: 240 Watts. Input Range: 100–240V AC, 50–60Hz, 4A. Output Rails: Main +12V (cumulative). 12VSB (Standby Voltage). ps42419ha schematic top

Uses high-frequency transformers and FETs to convert the high-voltage DC into regulated output voltages. Common Faults and Repair Solutions

A critical part of the board, often driven by the TNY279PN IC . This IC manages the 12VSB standby voltage that allows the computer to boot. 80 PLUS certified, with a typical efficiency of 90

This stage uses a dedicated controller and MOSFETs to ensure efficient power draw, maintaining a voltage of approximately 390V–400V across the main filter capacitor when active.

Repairing this unit often involves troubleshooting the standby rail, which is the most frequent point of failure. This switching power supply is known for its

The AC input enters through a fuse (often 4A) followed by an EMI filter consisting of X/Y capacitors and inductors to reduce noise.