+12VMAINpositive 12 cap V sub cap M cap A cap I cap N end-sub +12VSBpositive 12 cap V sub cap S cap B end-sub , White: +12V, Blue: -12V) to smooth output.
The PS42419HA is a high-performance, high-frequency power MOSFET driver IC designed for use in a wide range of applications. This device is capable of driving two N-channel MOSFETs in a half-bridge configuration, making it an ideal choice for power supplies, motor control, and other high-power applications. The PS42419HA is known for its high efficiency, reliability, and ruggedness, making it a popular choice among designers and engineers.
Key compatible HP system part numbers include , 508151-001 , 503376-001 , 508152-001 , 611482-001 , 613763-001 , 611481-001 , and 613762-001 .
Marked by the large input capacitor (usually ) and bridge rectifier.
3. Auxiliary / Standby Voltage Circuitry (The Core Failure Zone) ps42419ha schematic top
The PS-4241-9HA uses a proprietary 24-pin connector, but it is not a standard ATX connector. Main power to the motherboard.
The is a 240-watt power supply unit (PSU) primarily used in HP small form factor (SFF) desktops, such as the HP Compaq 6000 Pro and Elite 8000/8200 series . While a full, official manufacturer schematic is rarely released to the public, technical analysis and repair documentation provide a clear "top-down" view of its internal architecture and common failure points. HP PS-4241-9HA Core Specifications Max Output Power : 240 Watts.
From repair forum discussions, the main pins of the PS25A IC have been traced and identified. This pinout is a critical piece of information that effectively acts as a partial schematic for the controller:
Some units fail due to shorted secondary-side diodes or MOSFETs. 📋 Technical Specifications Rated Output Efficiency Rating 80 PLUS Bronze/Silver level (~88.8% average) Input Voltage 100-240V, 50-60Hz Key Components TNY279PN (Standby IC), 12V and 12VSB rails 🔍 Troubleshooting Guide +12VMAINpositive 12 cap V sub cap M cap
Primary winding between bulk cap and MOSFET drain. Auxiliary winding supplies VCC. Secondary winding (center-tapped or single) goes to the output rectifier.
: Many users report this failure occurring after their system was subjected to repeated power cuts or unstable grid voltage. This suggests the PSU's protection circuitry may be overly sensitive or that voltage spikes have damaged a component.
A heavy-duty, high-voltage electrolytic capacitor (typically rated at 400V–450V) that smooths the pulsed DC voltage out of the rectifier. 3. The Standby Voltage Rail (Primary Center-Right)
The auxiliary section operates independently from the main switching circuit to supply continuous power for motherboard wake functions. The PS42419HA is known for its high efficiency,
If the PSU is dead, check the input fuse and the four diodes in the bridge rectifier. Verify Standby Voltage ( 12VSB12 cap V sub cap S cap B end-sub
| Specification | Details | | :--- | :--- | | | PS-4241-9HA | | Brand | HP (Hewlett-Packard) | | Form Factor | Small Form Factor (SFF) | | Wattage | 240 Watts | | Output | 12V DC, proprietary ATX connector | | Compatible Systems | HP Elite 6000/8000 series, HP Pro 6000/6200 series (SFF models) | | Alternate P/Ns | 503376-001, 508152-001, PC8019, PC9058 |
High-side IGBTs require a gate voltage referenced to their emitter (the phase output), which floats up and down. The schematic top shows this clever trick:
Look for small "snubber" capacitors drawn across each IGBT—these are parasitic or optional external components that suppress voltage spikes during turn-off.