Lenovo A740- User Manual

Chapter 2. Safety information This chapter contains the safety information that you need to be familiar with before servicing a computer. General safety Follow these rules to ensure general safety: • Keep the areas around the computer clear and clean during and after maintenance. • When lifting any ...

• Keep the parts in protective packages until they are inserted into the product. • Avoid contact with other people while handling the part. • Wear a grounded wrist strap against your skin to eliminate static on your body. • Prevent the part from touching your clothing. Most clothing is insulative a...

To Connect To Disconnect 1. Turn everything OFF. 2. First, attach all cables to devices. 3. Attach signal cables to connectors. 4. Attach power cords to outlet. 5. Turn device ON. 1. Turn everything OFF. 2. First, remove power cords from outlets. 3. Remove signal cables from connectors. 4. Remove al...

Chapter 3. General information This chapter provides general information that applies to all computer models covered by this manual. Specifications This section lists the physical specifications for your computer. This section lists the physical specifications for your computer. Type Lenovo A540/A74...

Chapter 4. General Checkout Attention: The drives in the computer you are servicing might have been rearranged or the drive startup sequence may have been changed. Be extremely careful during write operations such as copying, saving, orformatting. Data or programs can be overwritten if you select an...

Chapter 5. Using the Setup Utility The Setup Utility program is used to view and change the configuration settings of your computer, regardlessof which operating system you are using. However, the operating system settings might override any similarsettings in the Setup Utility program. Starting the...

To set a Power-On Password, do the following: 1. Start the Lenovo BIOS Setup Utility program (See ”Starting the Lenovo BIOS Setup Utility program” on page 13.) 2. From the Security menu, select Set Power-On Password and press the Enter key. 3. The password dialog box will be displayed. Type the pass...

Select ATA Device Setup , press the Enter key, then select SATA Mode . Select Audio Setup , press the Enter key, then select Onboard Audio Controller . Select Network Setup , press the Enter key, then select Onboard Ethernet Support or LAN Boot Agent . 4. Select Disabled or Enabled and press the Ent...

a. If you do not want to save the settings, select Discard changes and Exit from the menu. b. If you have changed these settings and want to return to the default settings, select Load Optimal Defaults from the menu. Exiting the Lenovo BIOS Setup Utility program After you finish viewing or changing ...

Chapter 6. Symptom-to-FRU Index The Symptom-to-FRU index lists error symptoms and possible causes. The most likely cause is listed first.Always begin with Chapter 4, “General Checkout,” on page 11. This index can also be used to help youdecide which FRUs to have available when servicing a computer. ...

POST error codes Each time you turn the computer on, it performs a series of tests to check that the system is operatingcorrectly and that certain options are set. This series of tests is called the Power-On Self-Test , or POST . POST does the following: • Checks some basic motherboard operations • ...

Chapter 7. Replacing hardware Attention: Do not remove the computer cover or attempt any repair before reading the “Important safety information” in the Safety and Warranty Guide that was included with your computer. To obtain copies of the Safety and WarrantyGuide, go to the Support Web site at: ht...

Replacing the keyboard and mouse Attention: Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover. To replace the keyboard and mouse Step 1. Remove any media (disks, CDs, DVDs or memory cards) from the drives, shut down the operatingsystem, and turn off the comp...

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 cordand adapter to the same connector. Removing the base cover Note: Turn off the computer and wait 3 to 5 minutes to let it cool d...

Step 5. Return the computer to an upright position, then lift the base cover up and slide it out as shown. Step 6. To reattach the base cover: a. Line up the base cover with the base, slide it back and snap it into position. b. Place the computer face-down on a soft flat surface, then secure the bas...

Step 7. Remove the 4 screws that secure the hard disk drive to the bracket, then separate the hard diskdrive from the bracket. Step 8. Install the new hard disk drive as follows: a. Secure the new hard disk drive to the brackets with the 4 screws. b. Connect the data and power cable to the new hard ...

Step 5. Push out the latches on both sides of the memory socket to release the memory module. Gentlypull the memory module upward to remove it from its socket. Step 6. Align the new memory module with the memory socket, then insert it and push down on the topedge. Make sure the latches lock the memo...

Step 7. Lift the system fan up to remove it. Step 8. Line up the new system fan, then secure it to the heat-sink and connect the new power cableto the motherboard. Step 9. Reattach the base cover and secure it with the screws. Replacing the heat-sink Note: Turn off the computer and wait 3 to 5 minut...

Step 7. Remove the heat-sink by lifting it up. Attention: Place the heat-sink upside down on a flat surface to prevent thermal grease from contaminating other components. Attention: Use an alcohol pad to wipe the thermal grease off the heat-sink and CPU. Step 8. Use a thermal grease syringe to place...

Step 6. Remove the 4 screws that secure the speaker system to the motherboard. Step 7. Detach the speaker from the chassis. Step 8. To install the new speaker system: a. Attach the new speaker cable to the chassis and secure it with the 4 screws. b. Connect the new speaker cable to the motherboard. ...

Step 9. Remove the 3 screws that secure the motherboard to the chassis and slide it out as shown. Step 10. To install the new motherboard: a. Install the memory module to the connector on the new motherboard. b. Line up the new motherboard with the chassis and slide it into position. Align the holes...

Step 5. Disconnect the touch and LED panel cables from the connectors on the motherboard. Step 6. Remove the 6 screws that secure the hinge to the chassis 1 , then raise the hinge to remove it from the chassis. 2 1 2 Step 7. To reattach the hinge to the chassis: a. Line up the hinge with the chassis...

Step 8. Open up the LED panel from the bottom 1 , remove the 2 screws that secure the transform board to the rear cover 2 , and then disconnect the 2 cables from the transform board. 3 Step 9. Then separate the rear cover from the LED panel. Step 10. To reattach the rear cover: a. Line up the LED pa...

Step 6. Remove the rear cover. Refer to “Removing the rear cover”. Step 7. Remove the 2 screws that secure the transform board to the rear cover, and then lift it up toremove it. Step 8. Disconnect all the cables from the transform board. Step 9. Lift up the Wi-Fi card to remove it from the transfor...

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. Remove the base cover. Refer to “...

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. Remove the base cover. Refer to “...

Step 1. Remove any media (disks, CDs, DVDs, or memory cards) from the drives, shut down the operatingsystem, 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, ...

Step 1. Remove any media (disks, CDs, DVDs, or memory cards) from the drives, shut down the operatingsystem, 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, ...

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 scratchesor other damage. To replace the LED panel: Step 1. Remove any media (disks, CDs, DVDs, ...

Chapter 8. General information This chapter provides general information that applies to all computer models covered by this manual. Additional Service Information This chapter provides additional information that the service representative might find helpful. Power management Power management reduc...