Apple,
Diagnostics:-
LG G4 Battery Connector Terminal Jumper Ways
LG G4 Battery Connector Terminal Jumper Ways
Problem:-
LG G4 Dead Solution
LG G4 Battery Track Ways
LG G4 Battery Connector Jumper
LG G4 Terminal Jumper Ways
LG G4 Battery Connector Terminal Jumper Ways
Diagnostics:-
If LG G4 is not getting power ON, Replace the battery and try to power it ON. Plug in charging pin into jack and try to make it charge. Check batter terminal’s +v and -V points with electronics meter.
Solution:-
Dis assemble the phone LG G4 and check battery connectors if these are lose or not fix. Then check the whole mother board for water and rust damages, Carbon or broken parts.
If find some rust or carbon make it clean with electronics cleaner and apply hot air with heat gun to make it dry.
Find out these parts that are identified in above diagram and make check for volts. If find some broken parts or tracks are missing then apply jumpers as given in above diagrams.