Alienware x15 R1 and R2 palmrest junction board- this is the keyboard controller board, often referred to as the keyboard MCU (micro controller unit) board, this also acts as a junction board connecting the keyboard to the motherboard.
Compatible Dell Laptops:
Alienware x15 R1
Alienware x15 R2
DPN: 2DD76
alternate part numbers:
GDS50
LS-K473P