Introduction
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.
Tools
-
-
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.
-
-
-
Slide the opening pick down the right edge and around the bottom right corner to release the clips.
-
-
-
Slide the opening pick along the front edge and up to the top left corner to release the remaining clips securing the back cover.
-
-
-
Use clean fingernails to pull the CMOS battery connector out of its socket on the motherboard's bottom left corner.
-
-
-
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.
-
To reassemble your device, follow these instructions in reverse order.
Take your e-waste to an R2 or e-Stewards certified recycler.
Repair didn’t go as planned? Try some basic troubleshooting, or ask our Answers community for help.