Power supply service — If the bearing in a PSU cooling fan fails, what is the recommended component to replace?

Introduction / Context:
A failing power supply fan can lead to overheating, instability, and safety hazards. Servicing internal PSU components exposes technicians to dangerous voltages and stored energy, even when unplugged.

Given Data / Assumptions:

• Typical consumer/office ATX-style PSU with sealed enclosure.
• Fan bearing failure is diagnosed (noise, wobble, stalling).
• Standard safety practices are followed.

Concept / Approach:

Industry best practice is to replace the entire PSU rather than open and repair it. Inside a PSU, capacitors can retain lethal charge. Replacing only the fan or bearing requires opening the case, which most vendors discourage and which voids safety certifications. A new PSU restores safety compliance and reliability.

Step-by-Step Solution:

Verification / Alternative check:

Vendor service policies and A+-style training emphasize replacing the PSU rather than servicing internals in the field.

Why Other Options Are Wrong:

Replacing only the fan or bearing requires opening the PSU and is hazardous; replacing the case accomplishes nothing; “None” is incorrect because replacing the PSU is the recommended practice.

Common Pitfalls:

Running systems with a failing fan, attempting a DIY fan swap without proper discharge tools, and choosing a low-quality replacement with inadequate protections.

Final Answer:

Replace the entire power supply unit (PSU).