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Small green circuit board with a silver power button and fingerprint sensor area

DELL

Dell Precision 7770 7780 Power Button Board FP WMMY2

SKU CH-7TKA-5YJCE

Genuine Dell OEM power button board with fingerprint reader for Precision 7770 and 7780 laptops

  • Genuine Dell OEM part for Precision 7770 and 7780
  • Power button board with integrated fingerprint reader support
  • Exact replacement for Dell part number WMMY2
  • Designed for laptops equipped with optional fingerprint reader
  • New condition ensures reliable performance from installation

Power Button Board for Precision 7770 and 7780

This genuine Dell OEM circuit board replaces the power button assembly on Precision 7770 and 7780 laptops. It is specifically designed for units that include the optional fingerprint reader integrated into the power button. The part number is WMMY2.

Fingerprint Reader Integration Requirement

This board only functions on systems originally configured with the fingerprint reader on the power button. Installing it on a model without that option will leave the biometric feature inactive or cause a hardware mismatch. The connector and firmware expect the reader hardware to be present.

Verify Laptop Configuration Before Ordering

Confirm your Precision 7770 or 7780 shipped with the fingerprint reader on the power button. Check the original specifications or the device manager for the biometric device listing. This part is not compatible with standard power button boards that lack the fingerprint sensor.

How it compares

Measured against everything we stock in Cable Locks & Laptop Extras, at today’s prices. Recalculated every night.

Price $6.99
Cheaper than about 83% of the 8,808 comparable items (median $16.99).

Specifications

Product
Brand nameDell

Questions about this item

Which Dell Precision models use the WMMY2 power button board with fingerprint reader?

The WMMY2 board fits Precision 7770 and 7780 laptops that were built with the optional fingerprint reader integrated into the power button.

Does this board replace the power button on a Precision 7770 without a fingerprint sensor?

No, this circuit board is only for systems that have the fingerprint reader on the power button; it will not work on models without that feature.

What part number identifies the genuine Dell power button board for Precision 7770 and 7780 with fingerprint reader?

The Dell part number is WMMY2, which matches the fingerprint-reader power button board for Precision 7770 and 7780 laptops.

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