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Small black laptop cooling fan with wire connector

DBTLAP

DBTLAP CPU cooling fan KSB05105HA-AJ92 5v .35a

SKU CH-H08E-VEGXP

Replacement CPU cooling fan for Lenovo ThinkPad S420 and E420S laptops, tested before shipping

  • Accessory categoryCooler
  • Direct replacement for ThinkPad S420 and E420S
  • 5 V, 0.35 A power draw matches original spec
  • Pre-tested unit ensures reliable cooling performance
  • Single-fan package simplifies installation
  • Verify part number KSB05105HA-AJ92 for exact fit

Replacement Fan for ThinkPad S420 E420S

This replacement cooling fan is built for Lenovo ThinkPad S420 and E420S laptops. It operates at 5 volts and draws 0.35 amps. The part matches the KSB05105HA-AJ92 designation used in service manuals. It is intended for owners who need to restore original airflow after a bearing failure.

Tested Unit with Direct Mounting

Each unit is tested before shipping to confirm spin-up and noise levels. The housing uses the original screw pattern so it drops into the existing chassis without modification. A three-wire connector plugs straight onto the motherboard header. Buyers should compare the product photos with the old fan to verify the connector orientation.

Restores Stock Cooling Performance

Swapping a worn fan for this unit returns the laptop to its factory thermal profile. The jump is worth it when the original fan rattles, stalls or triggers thermal throttling under load. It does not add extra airflow beyond the design specification. Builders looking for higher static pressure or PWM control will need a different solution.

How it compares

Measured against everything we stock in Laptop Cooling Stands & Fans, at today’s prices. Recalculated every night.

Price $17.99
Cheaper than about 58% of the 6,190 comparable items (median $20.99).

Specifications

Product
Accessory categoryCooler

Questions about this item

What 5 V connector standard does the KSB05105HA-AJ92 fan use, and what current does it draw?

The fan runs on a 5 V supply and draws 0.35 A, matching the original Lenovo specification for the S420 and E420S series.

Which screw-hole pattern and cable length fit the ThinkPad S420 and E420S chassis?

The replacement unit mirrors the factory mounting points and connector reach of the KSB05105HA-AJ92, so it aligns with the existing heatsink brackets in those models.

How is the fan swapped, and which step do installers often miss?

Remove the bottom case, disconnect the old 3-wire plug, fit the new fan into the same mounts, reconnect the plug, then reapply thermal paste on the CPU before reassembly.

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