Reasons of Problems
Problem might be with your phone’s battery.
Any app might be causing power problems in your phone.
Voltage at battery’s terminal might be lower than the standard voltage.
Phone components might be water damaged.
Power button strip might be faulty.
Circuits might be short.
Power IC may be faulty.
The first step that must be done is to check the lines and resistors are bypassed as shown below, if there is a faulty resistor disold try to replace it.
The second step checks the path as shown below, if there is a path-breaking try to make jumpers carefully and thoroughly, because a small resistor is easily detached and lead to a break point.
Dis assemble the phone Samsung SM-G531H and check battery connectors if these are loose or not fix. Then check the whole motherboard 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.
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Samsung SM-G531H Battery Connector Point Solution,Battery Connector Ways Problem Jumper Repair Ways, Bsi Line Track Path