Dell Latitude 7490 CMOS Battery Replacement

简介

Use this guide to replace the CMOS battery in your Dell Latitude 7490 laptop.

If your laptop shows a BIOS configuration screen every time it's powered on, the CMOS battery may have died. Replace the CMOS battery to retain certain boot settings on your laptop.

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步骤 1 Prepare your laptop for disassembly

Dell Latitude 7490 CMOS Battery Replacement, Prepare your laptop for disassembly: 步骤 1 中的图像 1，2

Dell Latitude 7490 CMOS Battery Replacement, Prepare your laptop for disassembly: 步骤 1 中的图像 2，2

Allow your laptop's battery to drain below 25% before starting this repair—a charged battery may catch fire if damaged.
Unplug all cables and fully shut down your laptop.

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步骤 2 Flip your laptop over

Dell Latitude 7490 CMOS Battery Replacement, Flip your laptop over: 步骤 2 中的图像 1，1

Flip your laptop over so the rubber feet strips are facing up.

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步骤 3 Loosen the captive screws

Dell Latitude 7490 CMOS Battery Replacement, Loosen the captive screws: 步骤 3 中的图像 1，2

Dell Latitude 7490 CMOS Battery Replacement, Loosen the captive screws: 步骤 3 中的图像 2，2

Use a Phillips screwdriver to fully loosen the eight captive screws securing the back cover.

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步骤 4 Insert an opening pick

Dell Latitude 7490 CMOS Battery Replacement, Insert an opening pick: 步骤 4 中的图像 1，3

Dell Latitude 7490 CMOS Battery Replacement, Insert an opening pick: 步骤 4 中的图像 2，3

Dell Latitude 7490 CMOS Battery Replacement, Insert an opening pick: 步骤 4 中的图像 3，3

Plastic clips secure the back cover to the frame. You'll hear and feel them release as you work.
Insert the long side of an opening pick between the top right corner of the back cover and frame.
Pry the back cover up to release the clips securing the top right corner.

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步骤 5 Release the clips

Dell Latitude 7490 CMOS Battery Replacement, Release the clips: 步骤 5 中的图像 1，3

Dell Latitude 7490 CMOS Battery Replacement, Release the clips: 步骤 5 中的图像 2，3

Dell Latitude 7490 CMOS Battery Replacement, Release the clips: 步骤 5 中的图像 3，3

Slide the opening pick down the right edge and around the bottom right corner to release the clips.

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步骤 6

Dell Latitude 7490 CMOS Battery Replacement: 步骤 6 中的图像 3，3

Slide the opening pick along the front edge and up to the top left corner to release the remaining clips securing the back cover.

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步骤 7 Remove the back cover

Dell Latitude 7490 CMOS Battery Replacement, Remove the back cover: 步骤 7 中的图像 1，3

Dell Latitude 7490 CMOS Battery Replacement, Remove the back cover: 步骤 7 中的图像 2，3

Dell Latitude 7490 CMOS Battery Replacement, Remove the back cover: 步骤 7 中的图像 3，3

Remove the back cover.
During reassembly, lay the back cover on the frame and press down firmly around the perimeter to engage all the clips.

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步骤 8 Disconnect the battery

Dell Latitude 7490 CMOS Battery Replacement, Disconnect the battery: 步骤 8 中的图像 1，2

Dell Latitude 7490 CMOS Battery Replacement, Disconnect the battery: 步骤 8 中的图像 2，2

Grip the plastic tab on the battery connector and pull straight up to disconnect it.
During reassembly, align this connector over its socket and press down until it clicks into place. If it doesn't connect, re‑align it and try again.

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步骤 9 Disconnect the CMOS battery

Dell Latitude 7490 CMOS Battery Replacement, Disconnect the CMOS battery: 步骤 9 中的图像 1，3

Dell Latitude 7490 CMOS Battery Replacement, Disconnect the CMOS battery: 步骤 9 中的图像 2，3

Dell Latitude 7490 CMOS Battery Replacement, Disconnect the CMOS battery: 步骤 9 中的图像 3，3

Use clean fingernails to pull the CMOS battery connector out of its socket on the motherboard's bottom left corner.
If your fingernails aren't long enough, use a spudger to push on alternating sides of the connector to "walk" it out of its socket.

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步骤 10 Pry up the CMOS battery

Dell Latitude 7490 CMOS Battery Replacement, Pry up the CMOS battery: 步骤 10 中的图像 1，2

Dell Latitude 7490 CMOS Battery Replacement, Pry up the CMOS battery: 步骤 10 中的图像 2，2

Adhesive secures the CMOS battery to the frame.
Insert an opening pick between the left edge of the CMOS battery and the frame.
Use your pick to pry up the CMOS battery and separate the adhesive securing it.
If you're having trouble, heat an iOpener and apply it to the battery for two minutes. Alternatively, you can use a hair dryer to heat the battery.

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步骤 11 Remove the CMOS battery

Dell Latitude 7490 CMOS Battery Replacement, Remove the CMOS battery: 步骤 11 中的图像 1，3

Dell Latitude 7490 CMOS Battery Replacement, Remove the CMOS battery: 步骤 11 中的图像 2，3

Dell Latitude 7490 CMOS Battery Replacement, Remove the CMOS battery: 步骤 11 中的图像 3，3

在这个步骤中使用的工具：

Tesa 61395 Tape

$5.99

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Remove the CMOS battery, using your fingers to guide its wires out from under the speaker wires.
During reassembly:
Reconnect the CMOS battery.
Apply double-sided tape such as Tesa Tape to the battery and press it into place on the frame.