Toshiba T4700CS Maintenance Manual page 164

5. Remove one M2.5x6 screw and two M2x6 screws, securing the lower system
board and lift it out of the base assembly frame (figure 4-40).
6. Disconnect the sound system board from lower system board (figure 4-41).
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Figure 4-40 Removing the lower system board
Figure 4-41 Removing the sound system board
T4700CS, T4700CT, T4800CT