Lenovo T420 - Manual (Page 115)

c Platform Controller Hub (PCH)
d Graphic Processing Unit (GPU) (Discrete graphics chip)
Note: The GPU d is only for models with switchable graphics. Models with integrated graphics
do not have a GPU on the system board.
For Switchable Graphics models:
b
c
a
d
For Integrated Graphics models:
b
c
a
1
Chapter 8 . Removing and replacing a FRU 109