Lenovo SYSTEM BOARDS 5B21R31934 is compatible in the following Models:

Lenovo 500 Series (IdeaPad)

500w 2-in-1 Gen 5 (Type 83LH, 83LJ) Laptop (Lenovo) - 83LJS01M00
500w 2-in-1 Gen 5 (Type 83LH, 83LJ) Laptop (Lenovo) - 83LJS01P00
500w 2-in-1 Gen 5 (Type 83LH, 83LJ) Laptop (Lenovo) - 83LJS05600