Acer Aspire E1-521 Service Manual page 138

Connect the touchpad cable connector to the mainboard connector.
3.
TIP: Push the connector clips down, then connect the touchpad cable connector with the "MB"
label side up, then push the connector clips up to lock.
Connect the power board cable connector to the mainboard connector.
4.
TIP: Push the connector clips up, then connect the power board cable connector with the "MB"
label side up, then push the connector clips down to lock.
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Figure 5:53. Connecting the Touchpad Cable
Figure 5:54. Installing the Upper Case
Service and Maintenance