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The schematic will show several Zener diodes (marked ZD###) protecting the gates of MOSFETs. These fail shorted frequently. ps42419ha schematic work

This power supply is a proprietary "Custom" type. If you are performing a "schematic work" repair and find components like the PWM controller or high-side MOSFETs are faulty, it is often more cost-effective to replace the unit. You can find replacement modules on platforms like Scribd or through specialized hardware retailers. Ps42419ha Schematic Work [SAFE] Search for (use exact quotes for better results):

Troubleshooting and Repairing the HP PS-4241-9HA Power Supply If you are performing a "schematic work" repair

Always discharge the main high-voltage capacitor before touching the board. Check Standby Voltage: Measure the purple/green wire for +5V or +12V standby (depending on the specific HP pinout). Visual Inspection:

Most PS42419HA devices use Type-II compensation. A typical network: