So to check power management chip IC you will need to:
1. Plug the phone into charger (use the charging cable)
2. Make sure no battery installed
3. Get a digital multimeter
4. Set it to digital voltage mode (The icon with the up and down square and not wavy line)
For the next step there are 4 terminals, just match to the battery's positive and negative symbols on the battery itself.
5. Put black probe on the negative symbol (from battery) lining up for the battery connector terminal on the phone.
6. Put red probe on the positive symbol (from battery) lining up for the battery connector terminal on the phone.
7. Read what is on the digital multimeter it should be reading some voltage like 3.7v-4.2v to indicate that it is charging the battery fine.
8. If no read voltage like that then power management chip is most likely bad.
For the step below, the first and last charger port pins need to be measured (leftmost and rightmost pin)
9. To confirm this you will need to measure the charging port pins itself, if they read between 4.0v to 5.0v then power management ic is bad.
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