Samsung Galaxy J4 J400F Battery Connector Terminal Jumper Ways
If Samsung Galaxy J4 J400F isn’t always getting strength ON, Replace the battery and try to power it ON. Plug in charging pin into jack and attempt to make it charge. Check batter terminal’s +v and -V factors with electronics meter.
Dis bring together the cellphone Samsung Galaxy J4 J400F and check battery connectors if these are lose or not fix. Then take a look at the whole mom board for water and rust damages, Carbon or damaged components.
If locate some rust or carbon make it easy with electronics cleanser and practice hot air with heat gun to make it dry.
Find out these components that are recognized in above diagram and make check for volts. If discover a few broken parts or tracks are missing then apply jumpers as given in above diagrams.