The junction where the internal high-side and low-side MOSFETs meet. This pin connects directly to the power inductor.
To test the power supply independently of the main video board, you can perform a "force-on" test. Disconnect the power supply from the main board entirely. Using the schematic to identify the pins, bridge the pin to the PS-ON (or Power-On) pin using a 1kΩ resistor. This tells the PWM IC to turn on the rest of the board. Step 4: Measure the Secondary Output Rails
For further research, the following sources were used to create this guide:
The TNY279PN is the primary IC responsible for the standby rail. If your unit has no output and no standby voltage (missing on purple/green wires), this IC or its associated 1-ohm feed resistor are the most likely culprits. ps42419ha schematic work
The HP PS-4241-9HA Go to product viewer dialog for this item.
If the IC needs to automatically start up when power is applied, design a resistor divider from VIN to EN, ensuring the voltage does not exceed the maximum EN pin rating.
is an internal desktop power supply unit (PSU), commonly found in Slimline PC models. While a complete manufacturer schematic is rarely released to the public, repair documentation and official certifications highlight its key operational specifications and common failure points. Form Factor : Slimline/SFF (Small Form Factor). Total Power : ~240W. The junction where the internal high-side and low-side
When you begin your , the first task is to either find the correct symbol library or create it. A typical PS42419HA comes in a small outline package (e.g., SOP-8, TSSOP-14, or QFN-16). Below is a generalized pinout (always verify with your specific datasheet):
: This unit follows RoHS standards; use lead-free solder for all repairs to maintain board integrity.
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 Disconnect the power supply from the main board entirely
Typically ranges between 190V and 210V DC. This high-power rail drives the Y-Main and X-Main boards to illuminate the pixels.
The HP PS-4241-9HA is a reliable but proprietary unit that, when it fails, offers a steep challenge for repair. With official schematics unavailable, this guide serves as the most comprehensive resource compiled from hands-on experience.