Due to many requests of my customers, finally i got a solution of dead set of Samsung g531f.
Problem: Its not on or dead or not show voltage in the power supply.
Some time our customers drop down the phone due to drop down the cellphone, its ic damage or not work so its mechanism not work properly.
Solution: First check the phone’s battery
2nd Replace osc-4000 component which is highlighted in the upper picture solution.
If problem remains then replace ic named U4001 which is also highlighted in the upper picture solution.
Try the solutions one by one, i hope your problem will be solved.