Ps42419ha Schematic Work !new! -

If the schematic is working, you should see a stable 12.2V to 12.3V on the yellow wires. Safety and Repair Precautions

This circuit operates even when the computer is off. It provides the "wake-up" signal power.

Professional technicians often use a DIY Test Box with a series lamp (60W/200W) to prevent catastrophic shorts during testing. ps42419ha schematic work

Short the green wire (PS_ON) to any black wire (Ground).

A shorted diode at the output of the standby transformer can also kill the standby rail. If the standby IC looks physically intact, technicians often check these diodes first. How to Test the PS-4241-9HA If the schematic is working, you should see a stable 12

Large electrolytic capacitors on the high-voltage side can fail or exhibit high ESR (Equivalent Series Resistance), leading to fluctuating output or startup failure.

Incoming AC passes through a fuse and an EMI filter to remove noise. A bridge rectifier then converts it to high-voltage DC (around 145V–160V depending on load and region). Professional technicians often use a DIY Test Box

For specific disassembly layouts, refer to HP's Maintenance and Service Guides .

Understanding how the schematic works is essential for repairing this 240W Hewlett Packard (HP) power supply unit (PSU). Primarily used in HP desktop towers, this "80 PLUS" efficient model is known for specific failure points in its standby and primary rails. Overview of the PS-4241-9HA Architecture

Because this PSU contains high-voltage capacitors that can hold a charge after being unplugged, follow these safety steps: