Lenovo ThinkPad T61p Hardware Maintenance Manual page 113

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
Security chip
c
CPU
d
Video chip
e
MCH (Memory Controller Hub)
f
ICH (I/O Controller Hub)
Bending or flexing the system board can cause ball grid array (BGA) connections to
crack (unzip).
Table 34. Removal steps of system board and PC Card/ExpressCard slots assembly
Step Screw (quantity)
M2 × 3 mm, flat-head, nylon-coated (2)
1
c
d
f
e
b
a
1
1
Color
Silver
ThinkPad T61 and T61p (14.1-inch)
™
Torque
0.167 Nm
(1.7 kgfcm)
105