1130 System Board Assembly - Lenovo ThinkPad S431 Hardware Maintenance Manual

1130 System board assembly

Important notices for handling the system board:
When handling the system board, bear the following in mind:
• The system board has an accelerometer, which can be broken if several thousands of G-forces are applied.
Note: Dropping a system board from a height of as little as six inches so that it falls flat on a hard bench can subject
the accelerometer to as much as 6,000 G's of shock.
• Be careful not to drop the system board on a bench top that has a hard surface, such as metal, wood, or composite.
• If a system board is dropped, be sure to document the drop in any reject report, and replace the system board.
• Avoid rough handling of any kind.
• At every point in the process, be sure not to drop or stack the system board.
• If you put a system board down, be sure to put it only on a padded surface such as an ESD mat or a corrugated
conductive surface.
For access, remove these FRUs in order:
• "1020 Base cover assembly" on page 61
• "1030 Battery pack" on page 62
• "1040 Hard disk drive or solid-state drive assembly" on page 63
• "1050 Memory module" on page 65
• "1060 PCI Express Mini Card for wireless LAN" on page 66
• "1080 Thermal fan assembly" on page 68
Removal steps of system board
Attention: The following components soldered on the top side of the system board are extremely sensitive.
When you service the system board, avoid any kind of rough handling.
a
Platform Controller Hub (PCH)
b Microprocessor
c Graphics Processing Unit (GPU)
For models with a discrete thermal module
.
Chapter 9 Removing or replacing a FRU
75