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Introduction

Use this guide to replace a damaged or faulty speaker in your HP ProBook 640 G4 laptop.

The speaker is responsible for producing sound from your device. If you are experiencing issues such as no audio, distorted sound, low volume, or crackling noises, the speaker may need to be replaced.

Before starting, check your system volume settings and test your audio with headphones or external speakers to make sure the issue isn’t related to software or audio drivers.

Make sure to power off your laptop and disconnect it from any power source before beginning the repair.

What you need

Step 1 Lower Case

HP ProBook 640 G4 Speaker Replacement, Lower Case: step 1, image 1 of 2

HP ProBook 640 G4 Speaker Replacement, Lower Case: step 1, image 2 of 2

Loosen the eight 2.5 mm-long Phillips captive screws securing the lower case.
Captive screws cannot be fully removed.

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Step 2

Insert an opening pick into the seam between the lower case and chassis, and twist it to create a gap.
Insert an opening tool into the gap.
Use the opening tool to pry around the entire perimeter of the device until the lower case fully releases.
Remove the lower case.

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Step 3 Battery

HP ProBook 640 G4 Speaker Replacement, Battery: step 3, image 1 of 3

HP ProBook 640 G4 Speaker Replacement, Battery: step 3, image 2 of 3

HP ProBook 640 G4 Speaker Replacement, Battery: step 3, image 3 of 3

Use a Phillips screwdriver to loosen the six 2.5 mm-long captive screws securing the battery.
Captive screws are not fully removable—they only loosen.
Slide and lift the battery out.

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Step 4 SSD

HP ProBook 640 G4 Speaker Replacement, SSD: step 4, image 1 of 3

HP ProBook 640 G4 Speaker Replacement, SSD: step 4, image 2 of 3

HP ProBook 640 G4 Speaker Replacement, SSD: step 4, image 3 of 3

Loosen the four captive 2.5 mm-long Phillips screws securing the SSD.
Captive screws cannot be removed.
Grip the SSD and slide it out while lifting up.

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Step 5 RAM

HP ProBook 640 G4 Speaker Replacement, RAM: step 5, image 1 of 3

HP ProBook 640 G4 Speaker Replacement, RAM: step 5, image 2 of 3

HP ProBook 640 G4 Speaker Replacement, RAM: step 5, image 3 of 3

Two clips secure each RAM module in place, one on each side. Using your fingers, spread the clips away from the RAM module.
Repeat for the other RAM module.
Remove each of the two RAM modules.

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Step 6 Internal Casing

HP ProBook 640 G4 Speaker Replacement, Internal Casing: step 6, image 1 of 3

HP ProBook 640 G4 Speaker Replacement, Internal Casing: step 6, image 2 of 3

HP ProBook 640 G4 Speaker Replacement, Internal Casing: step 6, image 3 of 3

Remove 5 2.5 mm Phillips head screws.
Remove 12 6 mm Torx head screws.
Remove 2 2.5 mm Phillips head screws.
Loosen 4 2.5 mm Phillips head screws.
The 4 2.5 mm Phillips head screws do not come out; only loosen and are built into the frame.
Loosen 4 2.5 mm Phillips head screws.
The 4 2.5 mm Phillips head screws do not come out; only loosen and are built into the frame.

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Step 7 Fan and Heat Sink

HP ProBook 640 G4 Speaker Replacement, Fan and Heat Sink: step 7, image 1 of 1

Loosen the four 2.5 mm-long Phillips screws securing the heat sink.
Loosen the four 2.5 mm-long Phillips screws securing the fan.

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Step 8

Lift the heat sink out.

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Step 9

HP ProBook 640 G4 Speaker Replacement: step 9, image 3 of 3

Push the fan connector directly out of it socket.
Remove the fan.

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Step 10 Motherboard

HP ProBook 640 G4 Speaker Replacement, Motherboard: step 10, image 1 of 3

HP ProBook 640 G4 Speaker Replacement, Motherboard: step 10, image 2 of 3

HP ProBook 640 G4 Speaker Replacement, Motherboard: step 10, image 3 of 3

Remove the 2 mm-long Phillips screw.
Remove the 2.5 mm-long Phillips screw.

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Step 11

HP ProBook 640 G4 Speaker Replacement: step 11, image 3 of 3

Disconnect the ZIF connector by gently lifting the hinged locking flap on the connector's top edge until it's vertical, then carefully slide the ZIF connector straight out.
Lift the motherboard at an angle making sure to slide the ports out the casing.

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