Most of iPhone 7P charging fault are related with the charging port, or the phone battery, if you don't know how to fix the charging fault, just directly replacing it. If it still keeps invalid, you may need to find a phone repair shop.
Charging station ask a disassemble, along with the professional skill, so you may be interested what we will shared.
Check iPhone schematic diagram on WUXINJI Dongle, 5V charge voltage PP5V0_USB sent by the tail-plug interface，one circuit is sent to iPhone charge IC, one circuit is sent to iPhone USB control IC. The repair method is as follows.
Disassemble the iPhone 7 Plus with phone disassemble kits, remove the iPhone motherboard.
Measure the 5.0V voltage (PP5V0_USB) next to the iPhone charging IC with
Fluke 15B+ Digital Multimeter to check whether it exists. If not, then you need to replace the new iPhone tail plug flex cable. If yes, continue to check.
Measure the 5.0V voltage (PP5V0_USB) next to the iPhone USB control IC with multimeter to check whether it exists. If not, then you need to use QUICK 861DW hot air rework station to solder the jump wire from 5.0V voltage (PP5V0_USB) next to the iPhone charging IC to 5.0V voltage (PP5V0_USB) next to the iPhone USB control IC. If 5V is exist， then you need to replace the iPhone USB control IC and iPhone charge IC.
If you don't have enough tools to repair it, maybe you can borrow it from your friends, or purchase it on online shopping WEB.
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