Sony WF-1000XM4 Wireless Earbuds battery replacement

Stap 1 Prepare earbud opening

• Before beginning this repair, make sure you have completely discharged the battery of the earbud you wish to open. To do this, leave the earbud out of its charging case until the battery is completely discharged.
• This is a safety precaution to avoid the battery exploding in case of an unintentional short circuit or if too much heat is applied in step 3.
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Stap 2 Remove ear tip



• Pull on foam ear tip to remove it.
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Stap 3 Heat earbud
• Using a powerful hair dryer or a heat gun, heat the earbud for about ten seconds to soften the glue that sticks both parts of the earbud together.
• Careful: if you heat the earbud too much, the plastic shell may distort.
• Heat the earbud all around.
• This is a difficult step because you need to heat the earbud enough to soften the glue inside the earbud without burning the plastic of the earbud’s shell.
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Stap 4 Open the earbud shell

Gereedschap gebruikt in deze stap:
Jimmy
$7.95
Koop
• Take the thinnest possible tool, and slide it into the gap between the two parts of the earbud’s shell.
• Then, start to lever the two halves apart at the point circled in the picture.
• If the two parts don’t separate, you’ll need to heat the earbud a little more.
• When the two parts of the earbud’s shell start to separate, continue to separate them by levering all around the shell.
• Careful not to burn your fingers as the earbud will be very hot.
• In the picture I used the iFixit’s Jimmy opening tool, but I think the iFixit’s iFlex Opening Tool is better because it is thinner so it might make this step a bit easier.
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Stap 5 Unplug board-to-board connector
• Once the earbud is open, you will see two tiny circuit boards linked by a board-to-board connector.
• Using an Opening Pick, unplug the two circuit boards by levering very gently between them.
• Caution: Do not use a metal tool for this step, as the battery is still inside the earbud and you may unintentionally short-circuit components as they are still powered.
• Set the upper part of the earbud shell aside in order to reassemble it later.
• The upper part is highlighted in red in the third picture.
• The lower part is highlighted in dark blue in the third picture.
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Stap 6 Unlock the ZIF connector on the lower part circuit board
• Locate the ZIF connector on the lower part circuit board.
• If there is enough room, the battery may be removed without disconnecting the ZIF connector, making this delicate and difficult step obsolete
• Lift the flap of the ZIF connector using an Opening Pick or another thinner plastic tool.
• Careful: Do not use a metal tool for this step.
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Stap 7 Unplug the cable of the ZIF connector
• Using an Opening Pick or a spudger, gently unstick the glued cable.
• Then, gently unplug this cable.
• It may be a bit difficult to unplug. Take your time, and don’t force it. The cable is fragile.
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Stap 8 Unstick circuit board from the battery
• Find the junction between the electronic circuit and the earbud battery just below it.
• Using an Opening Pick or a very thin plastic tool, very gently unstick the circuit board from the battery by inserting the Opening Pick between the circuit board and the battery.
• The circuit board sticks directly to the negative battery terminal with adhesive.
• Caution: There is a tiny metal contact under the circuit board that makes contact with the battery. Unstick the circuit board gently to avoid damaging this contact.
• Do not use metal tools in this step as you may short-circuit the battery.
• Once the circuit board is unstuck from the battery, lift it up as shown on the third picture to have enough space to remove the battery.
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Stap 9 Remove the battery
• Remove the battery by lifting it up using the point of a spudger as shown on the first picture.
• A bit of force might be required here as the battery is glued to the underside with adhesive.
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Stap 10 Lift the metal contacts

Gereedschap gebruikt in deze stap:
Tweezers
$4.99
Koop
• Find the two metal contacts
• One highlighted in red.
• One highlighted in dark blue.
• If the contacts were flattened during the battery removal, very carefully lift them up a bit with the point of tweezers so that they will make good contact with the new battery when you reassemble the earbud.
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Stap 11 Install new battery
• Install the new battery by placing it in the earbud, negative terminal up.
• This step can be tricky, as the battery may be attracted by the magnet in the earbud when it is being inserted into the slot.
• The first picture shows the positive side of the battery.
• The second picture shows the negative side of the battery.
• The third picture shows the new battery installed inside the earbud.
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