Power Button Board (P/N 1-BRD421) for Lenovo ThinkPad P52s laptops. Compatible with the following series: 20LB, 20LB000AFR, 20LB000DZA, 20LB0019US, 20LB0021US, 20LC, T580, 20L9, 20LA, 20LAS7QF00, 20LAS7VB00, 20LAS7WN00, and others. Suitable for the following models: 20LB0026US, 20LBA027AU, 20LBA02EAU, 20LBCTO1WW, 20LBS00000, 20LBS00200, 20LBS00400, 20LBS01Q00, 20LBS02W00, 20LBS02Y00, 20LBS03V00, 20LBS09400, 20LBS09500, 20LBS0BF00, 20LBS0BM00, 20LBS0BS00, 20LBS0CH00, 20LBS0CJ00, 20LBS0CK00, 20LBS0D000, 20LBS0DH00, 20LBS0E500, 20LBS0ER00, 20LBS0F800, 20LBS0QL00, 20LBS0S700, 20LC0005AU, 20LCA01RAU, 20LCS03L0U, 20LCS03L1B, 20LCS03L2X, 20LCS0BA0L, 20LCS0ES00, 20LCS0K200, 20LCS0KY00, 20LCS0LK00, 20LCS0N500, 20LCS0QH00, 20LCS0QL00, 20LCS0S900, 20LCS0TD00, 20LCS0UD01, 20LCS0VE00, 20LCS0W70F, 20LCS0W70P, 20LCS0X200, 20LCS13X00, 20LCS15800, 20LCS16B00, 20LCS16W00, 20LCS17600, 20LCS17K00, 20LCS18G01, 20LCS1DU08, 20LCS1GY00, 20LCS1SV01, 20LCS1U100, 20LCS1W400, 20LCS1W500, 20LCS1XA00, 20LCS1XC00, 20LCS1XD00, 20LCS21400, 20LCS28H01, 20LCS28T28, 20LCS29700, 20LCS29701, 20LCS2AD06, 20LCS2AW15, 20LCS2H60.