Toshiba M40 - Manual (Page 171)

4.9 Top Cover 4 Replacement Procedures
Figure 4-27 Removing the top cover
3. Disconnect the switch board flat cable from CN5.
4. Disconnect the touch pad board flat cable from CN6.
5. Disconnect the I/O board flat cable from CN4.
6. Lift up the top cover.
EQUIUM M40/M45 / Satellite M40/M45 Maintenance Manual 4-37