Lenovo B305 Service Manual

							Chapter 8. Replacing hardware
      49
9. Connect the cables to the new inverter board.
10.  Align then screw in the new inverter board.
11.  Install the optical disk drive.
12.  Install the computer cover and computer stand.
Replacing the TV tuner card
To replace the TV tuner card
1. Remove the computer stand. Refer to “Removing the computer stand”.
2.  Remove the computer cover. Refer to “Removing the computer cover”.
3.  Remove the motherboard cover. Refer to “Removing the motherboard 
cover”.
4.  Disconnect the antenna cable from the TV tuner card.
5. Remove the screw that secures the TV tuner card to the motherboard. 
6. Pull the TV tuner card upward to remove it from the card port.
7. Align then screw in the new TV tuner card.
8.  Connect the antenna cable to the new TV tuner card.
9.  Screw back the motherboard cover.
10.  Install the computer cover and screw back the computer stand. 
						

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Removing the TV antenna connector
To remove the TV antenna connector:
1. Remove the computer stand. Refer to “Removing the computer stand”.
2.  Remove the computer cover. Refer to “Removing the computer cover”.
3.  Remove the motherboard cover. Refer to “Removing the motherboard 
cover”.
4.  Remove the 2 screws that secure the TV antenna connector to the 
motherboard.
5.  Lift up the TV antenna connector.
Replacing the motherboard
To replace the motherboard
1. Remove the computer stand. Refer to “Removing the computer stand”.
2.  Remove the computer cover. Refer to “Removing the computer cover”.
3.  Remove the motherboard cover. Refer to “Removing the motherboard 
cover”.
4.  Remove the memory module. Refer to “Replacing a memory module”.
5.  Remove the heatsink. Refer to “Replacing the heatsink”.
6.  Remove the microprocessor. Refer to "Replacing the microprocessor".
7.  Remove the WLAN card. Refer to “Replacing the WLAN card”.
8.  Remove the TV tuner card. Refer to “Replacing the TV tuner card”. 
						

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      51
9. Remove the TV antenna connector. Refer to "Removing the TV antenna 
connector".
10.  Remove all the cables that connected to the motherboard.
11.  Remove the 8 screws that secure the motherboard to the chassis.
12. Lift up the motherboard. 
13. Align then screw back the TV antenna connector to the new 
motherboard.
14.  Align then screw in the new motherboard to the chassis.
15.  Install all related components back to the new motherboard.
16.  Connect all the cables to the new motherboard.
17.  Screw back the motherboard cover.
18.  Install the computer cover and screw back the computer stand.
Removing the shell
To remove the back shell:
1. Remove the computer stand. Refer to “Removing the computer stand”.
2.  Remove the computer cover. Refer to “Removing the computer cover”.
3.  Remove the 5 screws that secure the shell to chassis. 
						

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4. Lift up the shell.
Replacing the camera
To replace the camera
1. Remove the computer stand. Refer to “Removing the computer stand”.
2.  Remove the computer cover. Refer to “Removing the computer cover”.
3.  Remove the shell. Refer to “Removing the shell”
4.  Pull the pins to each side to release the camera.
5. Lift out the camera. 
						

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      53
6. Disconnect the cable from the camera.
4. Connect the cable to the new camera.
5.  Align then screw in the new camera.
6.  Align then screw back the shell.
7.  Install the computer cover and screw back the computer stand.
Replacing the touch module
To replace the touch module:
1. Remove the computer stand. Refer to “Removing the computer stand”.
2.  Remove the computer cover. Refer to “Removing the computer cover”.
3.  Remove the screw that secures the touch module cover to the 
chassis.
4. Slide out the touch module cover.
5. Remove the screw that secures the touch module to the chassis and 
lift it up. 
						

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6. Disconnect the cables from the touch module.4
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7. Reconnect the cables to the new touch module.
8.  Align then screw the new touch module back.
9.  Align then screw the touch module cover back.
10.  Install the computer cover and screw back the computer stand.
Replacing the LED panel
To replace the LED panel
1. Remove the computer stand. Refer to “Removing the computer stand”.
2.  Remove the optical disk drive. Refer to “Removing the optical disk drive”
3.  Remove the computer cover. Refer to “Removing the computer cover”.
4.  Remove the motherboard cover. Refer to “Removing the motherboard 
cover”.
5.  Remove the touch module. Refer to “Replacing the touch module”.(Only 
for models with touch module)
6.  Disconnect the camera cable from the motherboard. 
						

							Chapter 8. Replacing hardware
      55
7. Disconnect the LED cable from the LED panel.
8. Remove the shell. Refer to “Removing the shell”.
9.  Remove the 6 screws that secure chassis to the front bezel.
10. Pull the pins to release the chassis from the front bezel. 
11. Place the computer upside down and separate the chassis from the 
front bezel. 
						

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12. Remove the 4 screws that secure the LED panel to the Chassis.
13. Lift up LED panel and disconnect the cable that connected to the LED 
panel.
 
14. Align then place the new LED panel to the chassis.
15.  Connect all the cables to the new LED panel, and screw in the new LED 
panel to the chassis.
16.  Install all relative parts back.
17.  Install the computer back cover and screw back the computer stand. 
						

							Chapter 8. Replacing hardware
      57
Replacing the keyboard 
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 or in the Hardware 
Maintenance Manual (HMM) for the computer. To obtain copies of 
the Safety and Warranty Guide or HMM, go to the Support Web site at: 
http://consumersupport.lenovo.com. 
To replace the keyboard: 
1. Remove any media (diskettes, CDs, or memory cards) from the drives, 
shut down the operating system, and turn off all attached devices and 
the computer. 
2.  Unplug all power cords from electrical outlets. 
3.  Locate the connector for the keyboard. Refer to “Left and right view” 
and “Rear view”.  
Note
Your keyboard might be connected to the standard keyboard 
connector 
 at the rear of the computer or to a USB connector  
either side or rear of the computer. 
12
4.  Disconnect the failing keyboard cable from the computer and connect 
the new keyboard cable to the same connector. 
						

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Replacing the mouse
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 or in the Hardware 
Maintenance Manual (HMM) for the computer. To obtain copies of 
the Safety and Warranty Guide or HMM, go to the Support Web site at: 
http://consumersupport.lenovo.com.  
To replace the mouse: 
1. Remove any media (diskettes, CDs, or memory cards) from the drives, 
shut down the operating system, and turn off all attached devices and 
the computer. 
2.  Unplug all power cords from electrical outlets. 
3.  Locate the connector for the mouse. Refer to “Left and right view” and 
“Rear view”. 
Note
Your mouse is connected to the USB connector at either side or the 
rear of the computer.  
4. Disconnect the failing mouse cable from the computer and connect 
the new mouse cable to the same connector.