| Table 31. | Parts list—Overall |   |   | 
| No. | FRU | FRU no. | CRU | 
|   |   |   |   | ID | 
|   |   |   |   | 
| 1 | LCD unit (see “LCD FRUs” on page 122 .) |   |   | 
|   |   |   |   | 
| 2 | Digitizer pen case assembly | 04W1477 | N | 
|   |   |   |   | 
| 3 | Backup battery | 02K7078 | N | 
|   |   |   |   | 
| 4 | 1-GB DDR3-1333 SDRAM SO-DIMM (PC3-10600) card Low Halogen | 55Y3715 | ** | 
|   | • | 4296-2Rx |   |   | 
|   | • 4298-2Xx, 38x, 3Mx, 3Nx |   |   | 
|   | • | 4299-28x, |   |   | 
|   |   |   |   | 
| 4 | 2-GB DDR3-1333 SDRAM SO-DIMM (PC3-10600) card Low Halogen | 55Y3716 | ** | 
|   | • | 4294-25x, 2Bx, 2Cx |   |   | 
|   | • | 4296-2Ax, 2Cx, 2Qx |   |   | 
|   | • | 4297-23x |   |   | 
|   | • | 4298-27x, 2Rx, 37x |   |   | 
|   | • | 4299-27x, 2Kx, 2Mx |   |   | 
|   |   |   |   | 
| 4 | 4-GB DDR3-1333 SDRAM SO-DIMM (PC3-10600) card Low Halogen | 55Y3717 | ** | 
|   | • 4294-24x, 26x, 27x, 2Dx, 2Ex |   |   | 
|   | • 4296-22x, 23x, 24x, 25x, 26x, 27x, 28x, 29x, 2Bx, 2Fx, 2Gx, 2Hx, 2Jx, 2Kx, 2Lx, 2Mx, |   |   | 
|   |   | 2Nx, 2Px, 2Sx, 2Tx, 2Ux, 2Wx, 2Xx, 2Yx, 2Zx, 32x, 33x, 36x, 37x, 39x |   |   | 
|   | • | 4297-22x |   |   | 
|   | • 4298-28x, 29x, 2Ax, 2Bx, 2Cx, 2Dx, 2Ex, 2Gx, 2Hx, 2Jx, 2Kx, 2Lx, 2Mx, 2Nx, 2Px, 2Qx, |   |   | 
|   |   | 2Sx, 2Tx, 2Vx, 2Wx, 35x, 36x, 39x, 3Ax, 3Bx, 3Cx, 3Dx, 3Ex, 3Fx, 3Gx, 3Hx, 3Jx, 3Kx, 3Lx, |   |   | 
|   |   | 3Px, 3Qx, 3Rx, 3Sx, 3Tx, 3Ux, 3Vx, 3Wx, 3Xx, 3Yx, 3Zx, 42x, 43x, 44x, 45x, 46x, 47x, 48x |   |   | 
|   | • 4299-2Dx, 2Ex, 2Fx, 2Gx, 2Hx, 2Jx, 2Lx, 2Nx, 2Px, 2Qx, 2Rx, 2Sx, 2Tx, 2Ux, 2Vx, 2Wx, |   |   | 
|   |   | 2Xx, 2Yx, 2Zx, 32x, 33x, 34x, 35x, 36x, 37x, 39x, 3Ax |   |   | 
|   |   |   |   | 
| 5 | System board assembly with Intel® Core™ i5-2520M processor, AMT, TPM, AES | 04W2127 | N | 
|   | • | 4294-23x, 24x |   |   | 
|   | • 4296-22x, 2Ax, 2Bx, 2Kx, 2Lx, 2Mx, 2Wx, 2Xx, 32x, 33x, 36x |   |   | 
|   | • | 4297-23x |   |   | 
|   | • 4298-27x, 28x, 2Ax, 2Dx, 2Gx, 2Hx, 2Jx, 2Kx, 2Lx, 2Mx, 2Nx, 2Px, 2Qx, 2Rx, 2Vx, 2Xx, |   |   | 
|   |   | 2Zx, 34x, 37x, 38x, 39x, 3Ax, 3Bx, 3Cx, 3Dx, 3Ex, 3Jx, 3Mx, 3Px, 3Qx, 3Rx, 3Sx, 3Vx, |   |   | 
|   |   | 3Wx, 3Zx, 42x |   |   | 
|   | • 4299-27x, 28x, 2Ax, 2Fx, 2Hx, 2Jx, 2Kx, 2Px, 2Qx, 2Tx, 2Ux, 2Vx, 2Wx, 2Xx, 2Yx, 35x, 36x |   |   | 
|   |   |   |   | 
| 5 | System board assembly with Intel Core i5-2520M processor, AMT, non-TPM, non-AES | 04W2131 | N | 
|   | • | 4294-CTO |   |   | 
|   | • | 4296-CTO |   |   | 
|   | • | 4297-CTO |   |   | 
|   | • | 4298-CTO |   |   | 
|   | • | 4299-CTO |   |   | 
|   |   |   |   | 
| 5 | System board assembly with Intel Core i5-2520M processor, non-AMT, TPM, AES | 04W2129 | N | 
|   | • | 4296-26x, 27x |   |   | 
|   | • | 4298-45x, 46x |   |   | 
|   |   |   |   | 
| 5 | System board assembly with Intel Core i5-2520M processor, non-AMT, non-TPM, non-AES | 04W2133 | N | 
|   | • | 4294-28x, 29x |   |   | 
|   | • | 4296-28x |   |   | 
|   |   |   |   | 
| 5 | System board assembly with Intel Core i7-2620M processor, AMT, TPM, AES | 04W2128 | N | 
|   | • | 4294-22x |   |   | 
|   | • 4296-2Dx, 2Ex, 2Nx, 2Px, 2Ux, 2Yx, 2Zx, 34x, 35x, 37x, 38x, 39x |   |   | 
|   | • 4298-26x, 29x, 2Bx, 2Cx, 2Ex, 2Fx, 2Sx, 2Tx, 2Ux, 2Wx, 2Yx, 32x, 33x, 35x, 3Fx, 3Gx, |   |   | 
|   |   | 3Hx, 3Kx, 3Lx, 3Tx, 3Ux, 3Xx, 3Yx, 43x, 44x, 47x, 48x |   |   | 
|   | • 4299-26x, 29x, 2Bx, 2Cx, 2Dx, 2Ex, 2Gx, 2Lx, 2Rx, 2Sx, 2Zx, 32x, 33x, 34x, 37x, 38x, |   |   | 
|   |   | 39x, 3Ax |   |   | 
|   |   |   |   |   |