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Short the green wire (PS_ON) to any black wire (Ground).
The PS-4241-9HA is a compact, non-modular power supply developed by Hewlett-Packard (HP) for its business-class SFF desktops [17†L7-L9]. It delivers reliable 240W of continuous power, which is sufficient for the moderate processing loads of office and home environments.
| 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 | ps42419ha schematic work
On the schematic, find the output pin (connector CN1, pin 1 or 2). Trace this back to the transformer. Do you have 5V? No. Trace back to the primary side.
The PS-4241-9HA is a switching power supply designed to convert 100-240V AC input into stable DC voltages (primarily +12V). Its work can be divided into several functional blocks: Short the green wire (PS_ON) to any black wire (Ground)
Because the PS-4241-9HA schematic relies on an active power factor correction boost layout, the primary-side DC bus operates at dangerous voltage thresholds up to .
Usually shorted (Drain to Source) or leaky. | Original Part | Schematic Symbol | Replacement
If the green wire registers an open-circuit voltage of roughly ~4.3V to 5V, but bridging it to ground yields no output from the main rail, the primary bulk section or supervisor loop is faulted.
: Monitor the high-voltage main smoothing capacitor for signs of swelling or leakage. Repair and Testing Steps
Most PS42419HA devices use Type-II compensation. A typical network:
: If the computer tries to turn on but clicks or shuts off right away, look at the large main filtering capacitor . These can bulge, leak, or dry out over time, causing unstable power delivery.