Ps42419ha Schematic Top |work| Jun 2026

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

For further exploration, refer to the and relevant HP service manuals for the specific desktop model you are working on. Always prioritize safety when handling internal PSU components, and consider using an adapter board if replacing the original PSU with a standard ATX unit.

The PSU is divided into primary (high voltage) and secondary (low voltage) sides, separated by a distinct barrier on the PCB. A. Primary Side (Hot Section)

[ AC Main Input: 115V / 230V ] | [ Input Fuse & EMI ] | [ Bridge Rectifier / PFC ] | +------------+------------+ | | [ Standby Circuit ] [ Main Switching Rail ] (TNY279PN Switcher) (Main Drive Transistors) | | [ Missing Standby Voltage? ] [ Missing Main 12V Rails? ] - Check 1-Ohm Resistor - Check Output Cap ESR - Replace TNY279PN - Check Optocouplers - Inspect Shunt Diodes - Verify PS-ON Shorting Issue A: Dead Standby Rail (Missing Standby Voltage)

Technicians regularly document recurring component failures on the PS-4241-9HA ps42419ha schematic top

. It is commonly found in small form factor (SFF) desktop systems such as the HP Compaq Elite 8000, 8100, 8200 Pro 6000/6005

: Includes a fuse, EMI filter, and a bridge rectifier to convert AC to high-voltage DC.

The PS42419HA schematic top provides a visual representation of the device's internal circuitry, highlighting its key components and their connections. The top-level schematic diagram consists of several main sections:

The PS-4241-9HA is built around a IC, manufactured by Silicon Touch Technology Inc. (SITI). This IC is a 3-channel secondary monitoring and protection controller responsible for: The HP/Compaq PS-4241-9HA is a 240W 80 PLUS

If the PSU is dead, check the input fuse and the four diodes in the bridge rectifier. Verify Standby Voltage ( 12VSB12 cap V sub cap S cap B end-sub

: Find the 8-pin (7 pins present physically) IC on the primary side of the standby transformer.

A low-resistance fusible feeding resistor (typically 1 Ohm ) acts as a sacrificial protection mechanism for the TNY279PN. Nearby components include high-speed switching diodes and specialized Zener diodes regulating reference thresholds.

Located near the AC input socket. It filters electromagnetic interference and protects against surges. Bridge Rectifier: Converts AC to DC. Main Electrolytic Capacitor ( CMAINcap C sub cap M cap A cap I cap N end-sub ] - Check 1-Ohm Resistor - Check Output

3. Auxiliary / Standby Voltage Circuitry (The Core Failure Zone)

| Block | Function | Key Components | |-------|----------|----------------| | | AC line filtering and DC conversion | Fuse, NTC, X/Y caps, bridge rectifier | | Primary Power Stage | Switching and energy transfer | PS42419HA, MOSFET, current sense resistor, transformer primary | | Startup & Auxiliary | IC bias and post-startup power | High-voltage resistor, auxiliary winding, VCC capacitor | | Secondary Rectification | Output voltage generation | Schottky diode, output capacitor, choke | | Feedback Isolation | Closed-loop regulation | Optocoupler (e.g., PC817), TL431 shunt regulator | | Protection Circuits | Fault handling | OVP, OCP, OTP sense resistors/diodes |

Analyzing the top view of the PS-4241-9HA motherboard reveals a classic split-plane configuration separating the high-voltage Primary Side from the low-voltage Secondary Side. The board layout follows a directional current path designed to minimize electromagnetic interference (EMI) and regulate thermal dissipation. 1. AC Input & EMI Filtering Stage (Rear Entry)