Without a physical schematic, professional repair follows a logical flow: board circuit diagram - HP Support Community - 8314868 25 Feb 2022 —
The PS-4241-9HA is a proprietary 240-watt power supply unit (PSU) manufactured by HP for use in its small form factor (SFF) desktops, particularly within the Compaq and Elite series. Given that schematics for proprietary PSUs like this are rarely made public, the information in this guide has been compiled from hands-on technician reports and hardware documentation to serve as an essential resource for repair and troubleshooting.
The AC voltage is rectified into pulsating DC by a bridge rectifier and raised to a stable high-voltage DC bus. ps42419ha schematic work
| Original Part | Schematic Symbol | Replacement | Note | | :--- | :--- | :--- | :--- | | 1N4148 | D### (Fast switching) | 1N4148 or 1N4448 | Do not use 1N4007 here | | SR5100 | D### (Schottky) | SB5100 or 10U100 | Must match voltage | | PC817 | IC### (Opto) | LTV817 or K1010 | Pin compatible | | TL431 | IC### (Shunt reg) | TL431A or KA431 | Always use A grade | | 2.2Ω resistor | R### (Fusible) | Metal film or fusible | Do not use carbon |
Typically ranges between 190V and 210V DC. This high-power rail drives the Y-Main and X-Main boards to illuminate the pixels. Without a physical schematic, professional repair follows a
Using the schematic, locate the gate drive resistors connected to these MOSFETs. When a MOSFET fails short, it frequently sends a high-voltage spike backwards through its gate pin, destroying the small surface-mount gate resistors and the driving PWM controller IC. Always replace the driving IC and check the surrounding diodes and resistors when replacing shorted primary transistors. Cold Solder Joints
Contains a slow-blow fuse (typically 5A/250V), a metal oxide varistor (MOV) for surge suppression, and a network of X/Y capacitors and common-mode chokes. | Original Part | Schematic Symbol | Replacement
Open the datasheet for your specific PWM IC (common in PS42419HA is or FAN6755 ).
It started with a rhythmic clicking—the sound of a relay desperately trying to engage. A veteran HP workstation, powered by the PS-4241-9HA
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