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Upon boot up, the computer may read a “CMOS checksum error,” or date and time keep getting reset. If this is the error you are receiving you should replace your CMOS Battery.

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  1. HP Envy TouchSmart 15 CMOS Battery Replacement, Battery: step 1, image 1 of 1
    • Press the battery release tab and the battery will pop up.

  2. HP Envy TouchSmart 15 CMOS Battery Replacement: step 2, image 1 of 1
    • Remove the battery from the laptop, it will come out easily.

  3. HP Envy TouchSmart 15 CMOS Battery Replacement, Accessory Plate: step 3, image 1 of 2 HP Envy TouchSmart 15 CMOS Battery Replacement, Accessory Plate: step 3, image 2 of 2
    • Remove the single screw holding the accessory plate. This is a PH0 2.0x2.5 screw.

  4. HP Envy TouchSmart 15 CMOS Battery Replacement: step 4, image 1 of 3 HP Envy TouchSmart 15 CMOS Battery Replacement: step 4, image 2 of 3 HP Envy TouchSmart 15 CMOS Battery Replacement: step 4, image 3 of 3
    • Pry the accessory plate up from the back of the laptop by applying force upwards where the screw was removed.

  5. HP Envy TouchSmart 15 CMOS Battery Replacement, CMOS Battery: step 5, image 1 of 3 HP Envy TouchSmart 15 CMOS Battery Replacement, CMOS Battery: step 5, image 2 of 3 HP Envy TouchSmart 15 CMOS Battery Replacement, CMOS Battery: step 5, image 3 of 3
    • Remove the screw from the wireless adapter with a PH0 screwdriver then move the adapter out of the way to access the CMOS battery.

  6. HP Envy TouchSmart 15 CMOS Battery Replacement: step 6, image 1 of 1
    • Use a plastic or metal spudger to release the CMOS battery from the clips.

  7. HP Envy TouchSmart 15 CMOS Battery Replacement: step 7, image 1 of 2 HP Envy TouchSmart 15 CMOS Battery Replacement: step 7, image 2 of 2
    • Remove the battery from the device.

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To reassemble your device, follow these instructions in reverse order.

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Robert Patterson

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