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Table 29. Location of major sensitive components on the system board in ThinkPad L420, L421, and L520 models
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 Accelerometer chip for the HDD Active Protection System
b Multi Chip Package (MCP) processor
c Video chip (only for discrete models)
d Platform Controller Hub (PCH)
For ThinkPad L420 and L421 models with an integrated thermal module (top side view):
a
For ThinkPad L420 and L421 models with an integrated thermal module (bottom side view):
b
d
94 Hardware Maintenance Manual