System board
Component Spare part number
System board equipped with an Intel Core i7-4710 processor (includes thermal grease and thermal pads)
Includes 16 GB of system memory and 4 GB of discrete graphics memory for use in models without the
Windows operating system
788615-001
Includes 16 GB of system memory and 4 GB of discrete graphics memory for use in models with Windows
8.1 Standard
788615-501
Includes 16 GB of system memory and 4 GB of discrete graphics memory for use in models with Windows
8.1 Professional
788615-601
Includes 8 GB of system memory and 4 GB of discrete graphics memory for use in models without the
Windows operating system
788616-001
Includes 8 GB of system memory and 4 GB of discrete graphics memory for use in models with Windows
8.1 Standard
788616-501
Includes 8 GB of system memory and 4 GB of discrete graphics memory for use in models with Windows
8.1 Professional
788616-601
Includes 8 GB of system memory and 2 GB of discrete graphics memory for use in models without the
Windows operating system
788614-001
Includes 8 GB of system memory and 2 GB of discrete graphics memory for use in models with Windows
8.1 Standard
788614-501
Includes 8 GB of system memory and 2 GB of discrete graphics memory for use in models with Windows
8.1 Professional
788614-601
Before replacing the system board, follow these steps:
1. Turn off the computer. If you are unsure whether the computer is off or in Hibernation, turn the
computer on, and then shut it down through the operating system.
2. Disconnect the power from the computer by unplugging the power cord from the computer.
3. Disconnect all external devices from the computer.
4. Remove the bottom cover (see
Bottom cover on page 23).
5. Remove the battery (see
Battery on page 31).
6. Remove the WLAN module (see
WLAN module on page 26).
7. Remove the SSD module (see
Solid-state drive (M.2) on page 28).
8. Remove the heat sink and fans (see
Heat sink and fans on page 29).
Remove the system board:
1. Disconnect the following cables from the system board.
(1): Display cable
(2): Left speaker cable
(3): Power connector cable
(4): Left light assembly
(5): TouchPad cable
34 Chapter 5 Removal and replacement procedures for Authorized Service Provider parts