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Lenovo A720 manual Removing the base cover, To remove the base cover

Models: A720

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Step 2. Locate the connector for the power cord. Refer to “Rear view”.

Step 3. Disconnect the failing power cord and adapter from the computer and connect the new power cord and adapter to the same connector.

Removing the base cover

Note: Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover.

Note: It may be helpful to place the computer face-down on a soft flat surface for this procedure. Lenovo recommends that you use a blanket, towel, or other soft cloth to protect the computer screen from scratches or other damage.

To remove the base cover

Step 1. Remove any media (disks, CDs, DVDs, or memory cards) from the drives, shut down the operating system, and turn off the computer and all attached devices.

Step 2. Unplug all power cords from electrical outlets.

Step 3. Disconnect all cables attached to the computer. This includes power cords, input/output (I/O) cables, and any other cables that are connected to the computer. Refer to “Left and right view” and “Rear view” for help with locating the various connectors.

Step 4. Place the computer face-down on a soft flat surface, then remove the 7 screws that secure the base cover to the base.

Chapter 8. Replacing hardware 31

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Lenovo A720 manual Removing the base cover, To remove the base cover

Contents

IdeaCentre A720 Hardware Maintenance Manual Page IdeaCentre A720 Hardware Maintenance Manual Page Contents Iv IdeaCentre A720Hardware Maintenance Manual About this manual Important Safety InformationIdeaCentre A720Hardware Maintenance Manual General safety Safety informationElectrical safety IdeaCentre A720Hardware Maintenance Manual Handling electrostatic discharge-sensitive devices Safety inspection guideGrounding requirements Safety noticesTo Connect To Disconnect Do not≥18 kg 37 lbs ≥32 kg 70.5 lbs ≥55 kg 121.2 lbs General information SpecificationsType IdeaCentre A720 EnvironmentIdeaCentre A720Hardware Maintenance Manual General Checkout IdeaCentre A720Hardware Maintenance Manual Starting the Lenovo Bios Setup Utility program Using the Setup UtilityViewing and changing settings Using passwordsSetting, changing, or deleting an Administrator password Administrator PasswordSetting, changing, or deleting a Power-On Password Select Save changes and Exit from the menu Enabling or disabling a deviceSelecting a temporary startup device Selecting a startup deviceSelecting or changing the startup device sequence Exiting the Lenovo Bios Setup Utility program IdeaCentre A720Hardware Maintenance Manual Hard disk drive boot error Symptom-to-FRU IndexPower Supply Problems Error FRU/ActionUndetermined problems Post error codesPost Error Message Description/Action Font view Locating connectors, controls and componentsLeft and right view Rear view CPU Hardware componentsIdentifying parts on the motherboard TV-Tuner card connector Battery Identifying parts on the back of the LED panel IdeaCentre A720Hardware Maintenance Manual Replacing hardware Pre-disassembly instructionsGeneral information To replace the power cord and power adapter Replacing the power cord or power adapterReplacing the keyboard and mouse To replace the keyboard and mouseTo remove the base cover Removing the base coverTo replace the hard disk drive Replacing the hard disk driveReplacing hardware Replacing the system fan Replacing a memory moduleTo replace a memory module To replace the system fanTo replace the heat-sink Replacing the heat-sinkTo replace the CPU Replacing the CPUReplacing hardware To replace the optical drive Replacing the optical driveReplacing hardware Replacing the optical drive eject board Replacing the solid state diskTo replace the solid state disk To replace the optical drive eject boardTo replace the motherboard Replacing the motherboardIdeaCentre A720Hardware Maintenance Manual To replace the speaker system Replacing the speaker systemIdeaCentre A720Hardware Maintenance Manual To replace the TV tuner card Replacing the TV tuner cardTo replace the battery Replacing the batteryTo remove the hinge from the chassis Removing the hinge from the chassisIdeaCentre A720Hardware Maintenance Manual To remove the rear cover Removing the rear coverTo replace the scalar board Replacing the scalar boardReplacing hardware To replace the touch control board Replacing the touch control boardTo replace the converter board Replacing the converter boardTo replace the power switch board Replacing the power switch boardTo replace the Bluetooth module Replacing the Bluetooth moduleTo replace the Wlan card Replacing the Wlan cardTo replace the camera Replacing the cameraTo replace the front function board Replacing the front function boardTo replace the LED panel Replacing the LED panelIdeaCentre A720Hardware Maintenance Manual FRU lists Motherboard Item # FRUs Service Part Number FRUHard disk drive MemorySolid state disk Optical disk driveRemote control Power SupplyBluetooth module Heat-sinkKeyboard Touch control boardMouse Power cordsPanel Back Light Cable MechanicalIdeaCentre A720Hardware Maintenance Manual Power management Additional Service InformationAdvanced configuration and power interface Acpi Bios Automatic Power-On features