Measure for 145V–340V across the main capacitor. Check continuity on the 1 Ωcap omega fusible feed resistor. Shorted Bridge Rectifier or main PFC/Switching MOSFETs.
Each switch is typically an (Insulated Gate Bipolar Transistor) with an antiparallel fast recovery diode (FRD). The emitter of the high-side IGBT and the collector of the low-side IGBT connect to form the output phase node (U, V, W) . These outputs drive the motor windings or transformer primary.
is a high-efficiency switching power supply that uses a multi-rail output system specifically designed for HP's proprietary motherboard connectors (typically 4-pin and 6-pin). Primary Side (High Voltage): Contains the bridge rectifier and a large main filtering capacitor
: The most common point of failure for "missing standby voltage." It is the primary controller for the standby rail. ps42419ha schematic top
Connect your microcontroller’s complementary PWM outputs (with dead-time inserted) to HIN1/LIN1 for phase U, HIN2/LIN2 for phase V, and HIN3/LIN3 for phase W. Use series resistors (100Ω) at the gate input pins to dampen ringing.
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
Once I have a better understanding of your requirements, I'll do my best to assist you in preparing a paper on the topic. Measure for 145V–340V across the main capacitor
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.
From a "top-down" schematic perspective, the PS-4241-9HA skips traditional multi-voltage rails (+3.3V and +5V) directly on the main PCB. Instead, it utilizes a modern , leaving downstream DC-to-DC converters on the HP motherboard to handle lower logic voltages.
: Utilizes high-voltage MOSFETs acting as high-frequency switches to chop the boosted DC voltage into alternating pulses for the main isolation transformer. Each switch is typically an (Insulated Gate Bipolar
A high-current bridge rectifier module often clamped to a dedicated internal aluminum heatsink. Immediately downstream sits the Main Bulk Electrolytic Filtering Capacitor (commonly rated around 450V, filtering the high-voltage DC bus).
Hewlett Packard / Lite-On / Chicony variations Max Output Power: 240 Watts continuous