is a 240-watt proprietary switching power supply unit (PSU) used heavily in Small Form Factor (SFF) desktop computers. It is prominently found in business-class systems like the HP Elite 8000, 8100, 8200, and Pro 6000 SFF series. Finding a precise layout schematic for the top layer of this board is essential for component-level diagnostics and board repairs.
is a widely used manufactured for corporate-class HP Elite and Pro Series desktop computers. Finding an official "top-level" circuit schematic for this unit from HP can be incredibly difficult due to proprietary manufacturing. However, engineering reverse-analysis and common workshop repair histories yield a highly accurate technical roadmap of its component layout, main rail distributions, and top failure points.
This is the most frequent culprit when a PC won't power on at all. If this chip burns out, the "missing standby voltage" prevents the motherboard from sending the power-on signal. Faulty Feed Resistors:
Features a large high-voltage electrolytic capacitor and an active Power Factor Correction inductor. ps42419ha schematic top
: This repair video covers instances where the PSU is completely non-functional, common in HP Compaq 6000 Pro systems.
The top-level circuit block diagram moves sequentially through these stages:
Technicians tracking the schematic output paths must note that HP utilizes a . Do not attempt to force splice this unit onto generic 24-pin computer hardware without an inline conversion adapter. The main wiring bundle consists of: is a 240-watt proprietary switching power supply unit
AC Input -- Fuse -- NTC -- CM Choke -- X-Cap -- Bridge Rectifier (+) --- HV Startup Resistor --- Bulk Cap (+) ------> Transformer T1 primary start | | +-----> PS42419HA Pin 1 (D/ST) | | Transformer T1 auxiliary winding --> Diode --> VCC Cap (+) --- PS42419HA Pin 2 (VCC) | +-----> Zener OVP PS42419HA Pin 6 (FB) <---- Optocoupler Transistor Collector | | GND Optocoupler LED cathode ---- TL431 Cathode TL431 Ref ---- Resistor Divider from Output (+) TL431 Anode ---- GND (secondary)
: The power-on command indicator line. In a healthy, un-triggered state, it hovers near 4.4V to 5V DC .
Powers the chipset when the PC is off.
The PS-4241-9HA is known to develop specific faults, particularly due to electrical stress (power surges, brownouts, or abrupt power cuts). Below is a summary of the most frequently reported issues and their observed fixes, based on real repair logs from forums.
A heavy-duty, high-voltage electrolytic capacitor (typically rated at 400V–450V) that smooths the pulsed DC voltage out of the rectifier. 3. The Standby Voltage Rail (Primary Center-Right)
💡 If you're repairing this unit, consider replacing the TNY279PN with a slightly higher-rated 20-watt version for better heat tolerance. Are you planning to repair a faulty unit or is a widely used manufactured for corporate-class HP