Lenovo SYSTEM BOARDS
5B21C21419
is compatible in the following Models:
Lenovo ThinkPad X Series laptops
ThinkPad X1 Carbon - 20QDCTO1WW
X1 Carbon 7th Gen - (Type 20QD, 20QE) Laptop (ThinkPad) - 20QDS00V00
X1 Carbon 7th Gen - (Type 20QD, 20QE) Laptop (ThinkPad) - 20QDS5UY0Q
X1 Carbon 7th Gen - (Type 20QD, 20QE) Laptop (ThinkPad) - 20QDSOEL00
ThinkPad X1 Carbon - 20QES0W300
X1 Carbon 7th Gen - (Type 20QD, 20QE) Laptop (ThinkPad) - 20QES4LY00
ThinkPad X1 Carbon - 20QEW5JU04
X1 Yoga 4th Gen (Type 20QF, 20QG) Laptop (ThinkPad) - 20QFS00K00
ThinkPad X1 Yoga - 20QFS0BJ00
ThinkPad X1 Yoga - 20QG52P70F