Bàn phím Laptop Dell Inspiron N4110 N4120 N4050 M4040 M5040 N5040 N5050 14R 3420 3520 3330 5420 7420 15R 5520 7520 Vostro 3350 3450 3460 3550 3555 3560 V131 1440 1445 1450 1540 1550 2420 13Z N311Z 14Z N411z M411R