Just cleaving the board or drying is not enough, you should clean it with isopropyl alcohol in order to parent it from making corrosion. and also when you take it apart one s heatsink Nirmal doesn’t come apart, you ll have to remove heatsink and see if liquid is still huddled under the heatsink( but careful as heatsink is not easily comes off if you don’t know what to do, and don’t damage the cpu while taking apart) good luck
To examine whats actually wrong with it depends on the history of the phone. check if your phone is liquid damage or not, if it’s not WD than change the charging port and it might sort the issue if charging port is faulty, if it still won’t work, than probably audio ic or any component faulty/damage on the circuit board.
Hi all helpers, i found the solution as WiFi address and Bluetooth address are more important than all of the rest information(as new phones have so many serial numbers) so so I found a service I can retrieve the Bluetooth address and WiFi address from the serial number and imei number. so for your information if it happens there is a solution for it.
1 there may be something(fluff) stick inside. Try to clean it with the toothpick as they are safer than any metal pointy thing. And clean it out the dust, fluff 2 if that won’t fix the issue you ll have to change the charging port flex cable
Something is probably shorted to ground in the phone that’s why it’s pesosting the issue. Or battery might be faulty itself. It doesn’t matter it’s been done by Apple or thirst party. After all Apple will deny lot of mistake they have done in iPhone 7 design. It’s a deep debate. In your case(the phone can be repaired and problem can be solved, but because you used Apple authorised repair centre that’s why you shouldn’t go to third party repairs. Instead go to Apple store and explain them the problem started after the work has been done on the phone. I think you ll be get it sorted.