Lenovo A7-50 Tablet - Manual (Page 49)

Lenovo A3500
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17. Desolder the volume key FPC from the PCBA using a soldering iron and a
solder sucker.
Figure 4-17. Position of desoldering the volume key FPC
18. Remove the volume key FPC from the PCBA.
Figure 4-18. The removed volume key FPC
19. Peel off the mylar on the soldering pad of the reset key FPC.
Figure 4-19. Position of the mylar on the reset key FPC