1190 System Board - Lenovo ThinkPad X13 Yoga Gen 4 Hardware Maintenance Manual

Removal steps of the pen charger cable
Step Screw (quantity)
3
M1.6 × 2.5 mm, flat-head, nylon-coated (1)
When installing: Ensure that the connector is attached firmly.

1190 System board

Notes:
• If the new system board does not come with a new solid-state drive thermal pad or wireless WAN thermal
pad (for 5G models of ThinkPad X13 Gen 4 only), it is suggested that you order extra thermal pads in case
the old thermal pads are damaged during the replacement.
• After replacing the system board, remember to make the sensor calibration. For details, see "Sensor
calibration (for ThinkPad X13 Yoga Gen 4 only)" on page 62.
Important notices for handling the system board:
When handling the system board, read the following:
• Some components mounted on a system board are very sensitive. Improper handling of a system board
can cause damage to those components, and may cause a system malfunction.
• The system board has an accelerometer, which can be broken when several thousands of G-forces are
applied.
Note: Dropping a system board from a height of as little as 6 inches so that it falls flat on a hard bench
can subject the accelerometer to as much as 6000 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.
• 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.
• Avoid bending a system board and hard pushing to prevent cracking at each BGA (Ball Grid Array)
chipset.
90
ThinkPad X13 Gen 4 and ThinkPad X13 Yoga Gen 4 Hardware Maintenance Manual
Color Torque
White 0.181 Nm
(1.85 kgf-cm)