The HP PS-4241-9HA Go to product viewer dialog for this item.
: Driven by a PWM controller chip to feed the main step-down high-frequency transformer. 3. Standby Circuitry (The 12VSB Top-Level Flow)
The PS42419HA acts as the primary controller. Its standard pin functions (typology) are:
Many PS-4241-9HA units suffer from a failed TNY279PG IC. The TNY279PG is a Switcher IC that generates the 12V Standby rail ( 12VSB12 cap V sub cap S cap B end-sub ps42419ha schematic top
The PSU shows no output because the green/purple standby lines are dead. This is frequently due to a failure in the TNY279PN IC and its associated 1-ohm starter resistor.
is a 240W proprietary power supply unit (PSU) commonly used in HP Compaq and Elite series Small Form Factor (SFF) desktops. Finding a complete official schematic is difficult because HP often treats these as proprietary, but technical repair resources and pinout data provide the necessary details for troubleshooting. Model Number : PS-4241-9HA
Powers the chipset when the PC is off.
If the fan spins and you measure +12V on the yellow wires and +5V on the red wires using a digital multimeter, your PSU is successfully jumping. Sourcing Schematics and Replacement Parts
Synchronous rectification systems and heavy-duty diodes transform the high-frequency AC into stable, low-voltage outputs.
This IC integrates a 700V power MOSFET and a PWM controller. It takes the rectified high-voltage DC and steps it down to a stable +5VSB to communicate with the motherboard's power button. 3. The Secondary Stage (Outputs) The HP PS-4241-9HA Go to product viewer dialog for this item
. While public schematic diagrams for this proprietary unit are generally unavailable, technical forums often provide repair insights on its PFC and standby circuits . Find additional technical data in this Scribd document Samsung TV Power Supply Schematics | PDF - Scribd
: If you need to verify its performance without a schematic, you can check the 12V rails (12V1, 12V2) for stable DC terminal voltage during load. Safety Warning
is structured around a topology utilizing active Power Factor Correction (PFC). Because it is a proprietary HP business-desktop supply, it does not output traditional 5V or 3.3V lines to the motherboard; instead, it outputs variations of 12V rails , leaving the 5V/3.3V down-conversion to the motherboard's VRMs. 1. Input Stage & EMI Filtering Standby Circuitry (The 12VSB Top-Level Flow) The PS42419HA
Often stepped down from the 12V rail using DC-to-DC converters on modern PSUs, or generated directly via secondary transformer taps on this model.
: Official HP support suggests replacing the entire unit rather than attempting internal repairs.