Ps42419ha Schematic Work !!top!! Link

PS-4241-9HA

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

• Samsung LN40A550P3F
• Samsung LN46A550P3F
• Possibly other A550/A650 series.

• Space-efficient power control: The PS42419HA packs regulation and protection features into a tiny footprint, making it ideal for constrained PCBs.
• Battery-friendly: Designed for low quiescent current, it stretches battery life in intermittent-use devices.
• Protection-first: Built-in safeguards (thermal/shutdown and short-circuit protection) simplify design and improve reliability without extra components.

• ElektroTanya (elektrotanya.com) – search Samsung LN40A550 → download service manual (PDF). The PSU schematic is on pages ~50–60.
• Manualslib / ManualsPlus – service manual often free after short wait.
• Badcaps.net forums – users post PSU schematics and repair tips for PS42419HA.

Design Considerations for PS42419HA Schematic Work

The moment of truth came with the "paperclip test." Connecting the green wire to the black (ground) on the ATX connector, the fan spun to life. A steady 12.2V appeared on the meter. The "clicking ghost" was gone, and the PS-4241-9HA returned to service, proving that with a solid schematic and a little patience, even "obsolete" hardware can find a second life. Key Technical Specs for the PS42419HA ps42419ha schematic work