D10-240p1a — Schematic [new]

The HP D10-240P1A Go to product viewer dialog for this item.

Design and modification notes

: Rated for high efficiency (80 Plus Gold standard in some configurations). Connector Pinout Guide D10-240P1A D10-240p1a Schematic

Elias looked at the schematic again, focusing on the annotation scribbled in the margin of the third page, barely legible: “To dampen the sound of the earth, one must sing the counter-note. Do not ground to earth. Ground to the void.” The HP D10-240P1A Go to product viewer dialog for this item

Shorted MOSFETs:

Specifically the 12V rail. Faulty transistors like the 65 SL 190D or diodes like the MURF 8 L60 are known to fail. Components: Auxiliary winding on main transformer

D10-240P1A

The is a 240W proprietary switching power supply (SMPS) manufactured by HP (often under the Lite-On or Delta brands) for its small form factor (SFF) business desktops, such as the Elite 8000, 8100, 8200, and 8300 series .

• Components: Auxiliary winding on main transformer, small capacitor (50V, 47µF), startup resistor (high value, 100k-200k, 2W) feeding VCC to PWM IC.
• On the schematic: The yellow "bootstrap" circuit. Without it, the PWM IC never starts.
• Common failures: Startup resistor goes open (no VCC → unit completely dead). Dried auxiliary capacitor causes cycling on/off.