Ps42419ha Schematic Top Page

The HP/Compaq PS-4241-9HA is a 240W 80 PLUS certified power supply used in SFF desktops like the Elite 8000/8200 and Pro 6000/6200 series, featuring 90.51% peak efficiency

Features a large high-voltage electrolytic capacitor and an active Power Factor Correction inductor.

From the secondary side—the cool, low-voltage output end—a thin trace left the +5V output terminal and ran back through an optocoupler, . A tiny, sealed IC with a glowing LED inside. On the schematic, it crossed the thick "isolation barrier" drawn as a dashed line. On the primary side, the optocoupler’s transistor whispered back to IC1: "Too much voltage. Slow down." Or, "Not enough. Push harder."

A low-resistance safety flameproof resistor (typically 1 Ω ) feeding the drain pin of the TNY279PN chip. 4. Main DC-DC Switching & Secondary Output (Right Side) ps42419ha schematic top

A common failure point located near the smaller standby transformer. This chip is often identified as having a blown standby voltage IC.

Before analyzing the top-level schematic and circuit board topology, review the foundational operational parameters of the PS-4241-9HA: Specification Details HP / PS-4241-9HA (Interchangeable with PS-4241-9HB) Form Factor Compatibility HP Compaq 6000, 6200, 6300, 8000, 8100, 8200, 8300 SFF Max Output Power Input AC Voltage Range 100V – 240V AC (Universal Input, 50–60 Hz) Primary DC Outputs +12.2V Main Rails, -12V Auxiliary Rail Efficiency Certification 80 PLUS Gold (90.51% peak efficiency at 50% load) High-Level Architectural Schematic Layout

High ESR in primary auxiliary capacitor or secondary output filter caps. The HP/Compaq PS-4241-9HA is a 240W 80 PLUS

The PS42419HA is not a publicly documented industry-standard IC (like an LM317 or a TPS5430). It is most likely a proprietary part number used by a specific manufacturer (e.g., Samsung, LG, Delta, or a Chinese OEM) in a power supply for a TV, monitor, laptop adapter, or industrial device. The following article reconstructs the expected top-level schematic architecture based on common flyback and LLC resonant topologies used in such controllers.

High Equivalent Series Resistance (ESR) or physical leakage in the main bulk reservoir capacitor, or degraded secondary-side output caps.

High-grade, low-ESR electrolytic filter capacitors paired with output inductors to minimize ripple voltage on the final output lines. Common Failure Points & Diagnostic Steps On the schematic, it crossed the thick "isolation

The internal board is designed with a high-density layout typical of SFF units. Key component clusters include:

Check for shorted secondary diodes near the standby transformer.