HP EliteBook 840 G3 touchpad button board replacement

Step-by-step HP EliteBook 840 G3 touchpad button board replacement rewritten in our own words from HP's Maintenance and Service Guide, with page citations.

Part you need821171-001HP touchpad 821171-001 for the HP EliteBook 840 G3
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On this page
  1. Applies to
  2. tools and parts
  3. preparation
  4. replacement
  5. Part numbers in our catalog
  6. Manufacturer manual
Source: steps rewritten in our own words (no more than 8 words in a row copied; part numbers, screw sizes and warnings kept as printed) from HP's Maintenance and Service Guide (PDF, printed pages 66–67). Not bench-tested. We have not performed this repair; keep HP's manual open for its illustrations. Scope restrictions below are part of the guide: do not apply it to other models, generations or configurations. Service manuals are written for trained technicians; work at your own risk.

Labels: DOCUMENTED = taken from HP's manual; PROPOSED = our own joining or ordering of HP's directions, not an HP instruction; UNPERFORMED = a suggested check that has not been carried out.

Applies to

HP EliteBook 840 G3. Confirm the exact model on the service label before starting.

HP EliteBook 840 G3 Notebook PC touchpad button board replacement. HP prints this procedure on printed page 66 of its maintenance and service guide, and the spare-part table for this part is on printed page 66.

tools and parts

  • Phillips P0 drivers
  • Static-safe work surface
  • 821171-001 - Touchpad button board for HP EliteBook 848 and HP EliteBook 840. Source: printed page 66.
  • 821172-001 - Touchpad button board w/NFC antenna (not for HP ZBook 15u). Source: printed page 66.
  • 836620-001 - Touchpad button board for HP EliteBook 850. Source: printed page 66.
  • 821153-001 - Touchpad button board for HP ZBook 15u. Source: printed page 66.
  • 821154-001 - Touchpad button board w/NFC antenna for HP ZBook 15u. Source: printed page 66.

preparation

HP prints its tools list and its handling and electrostatic-discharge cautions on printed page 30. Work on a grounded, static-safe surface, keep screws grouped by the position they came from, and handle boards and modules by their edges.

replacement

  1. Detach cable from touchpad to smart card reader board (1), and then disconnect NFC antenna from the NFC module (2). (printed page 66).
  2. Lift the tape, and then remove the 2 Phillips PM2.5x2.5 screws that hold the touchpad button board to the top cover. (printed page 66).
  3. Lift top of the touchpad button board up (printed page 67).
  4. Put the touchpad button board back by repeating the printed removal moves in the opposite order (printed page 67).

Part numbers in our catalog

Check each part page for its source and variant notes before ordering.

Manufacturer manual

HP Maintenance and Service Guide (PDF, HP). Machine-readable copy: /api/guides/hp-elitebook-840-g3-touchpad-button-board-replacement-p66

Key facts

HP document part number
831002-002
Model
HP EliteBook 840 G3
Release year
2015
Screen size
14"
Printed pages
66–67

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