Samsung SM-A720F Quick Start Manual page 8

7. Level 2 Repair
9
Press Back Glass.(1N for 1minute)
※ Caution
1) Be care of scratch.
11
If fail WRT doing debugging(sealing or etc)
※ Caution
1) Be care of scratch.
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10
Do water resistance test(WRT)
※ Caution
1) Be care of scratch.
12
If IF connector problem, disassemble
& remove gasket
※ Caution
1) Be care of PBA damage