If 5Vsb is missing or fluctuating, proceed to inspect the secondary side of the standby circuit. Step 3: Components Inspection
Before analyzing the internal schematic logic, technicians must grasp the operational parameters defined in the HP PS-4241-9HA Technical Certificate: Rated Specification 100–240 V AC (Universal Range) Input Current / Frequency 4.0 A Max @ 50–60 Hz Total Max Output Power Peak Efficiency 90.51% at 50% Load Form Factor HP Proprietary Custom Desktop Phase 1: Main AC Input & EMI Filtering Stage
The input stage and standby section are functional. Proceed to Step 3. Step 3: Simulate the "Power On" Command
What is the computer showing? (No power, blinking light, clicking noise) What voltages have you measured on the output pins?
Outputs the stable +12V rail. A secondary-side supervisor IC monitors the rails for Over-Voltage Protection (OVP), Under-Voltage Protection (UVP), and Over-Current Protection (OCP). Common Failure Points and Troubleshooting
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With the PS-ON signal jumpered, measure the secondary outputs: Powers audio amplifiers and general logic.
The PS-4241-9HA is a proprietary power supply manufactured by Hewlett-Packard, delivering up to 240W of power to the host system. It is exclusively designed for HP's Small Form Factor (SFF) line of business desktops, which includes models such as the HP Elite 6000, 6005, 8000, 8100, and similar systems like the Z200. Its compact design is tailored to fit the tight internal chassis of these SFF computers, making it a common component in corporate and educational environments where space is a premium.
Knowing the exact specifications is the first step in any troubleshooting or replacement process. The PS-4241-9HA has the following key technical details:
“It’s just dead,” the foreman had said. “No smoke. No pop. Just… nothing.”
The PS25A IC is a crucial component that monitors key voltages and manages the power sequencing and protection features [18†L16-L17]. Based on repair findings, the pinout for this IC is as follows:
is a widely deployed, 240-watt proprietary Desktop Power Supply Unit (PSU) designed by Hewlett-Packard. Certified under the 80 PLUS efficiency standard
(e.g., blown caps)?
Smooth the final +12V, +5V, +3.3V, and -12V outputs. 3. PS42419HA Schematic Work: Troubleshooting & Repair Steps When dealing with a non-functional PS-4241-9HA Go to product viewer dialog for this item.
RDS(on)cap R sub cap D cap S open paren o n close paren end-sub MOSFETs on the secondary side to minimize power loss.
If absent, trace the schematic to the .
