Lenovo A7-50 Tablet - Manual (Page 48)

Lenovo A3500 Hardware Maintenance Manual
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15. Desolder the power key FPC from the PCBA using a soldering iron and a
solder sucker.
Figure 4-15. Position of desoldering the power key FPC
16. Remove the power key FPC from the PCBA.
Figure 4-16. The removed power key FPC