Chosen Solution
I bought an iPhone 6 battery from this website and replaced the battery of an iPhone 6 Plus that I have. After I replaced the battery, the phone turned on for like 10 seconds, the screen was white with the apple logo in the middle. Then it turned off and never turned on again. I thought that maybe it was the battery that was faulty so I bought a new battery. I tested the new battery and still the phone won’t turn on. I am using an original iPhone charger and the phone doesn’t get warm when I plug it in. Could it be something with the motherboard?
Just for clarification, you bought a iPhone 6 or 6 plus battery? Because you can’t fit 6 battery in a 6 plus and vice versa.
Could be your “New” batteries needed charged a bit and your Charging port is bad or “Clogged”. Check and clean the charging port out to make sure it is not clogged up with lint, etc… Then, if it still doesn’t work or charge… it could be you have a bad U2 (Tristar) charging USB IC and would require Micro Soldering to put on a new one (1610a2). You can also unplug your battery and test the battery and the logic board connector to see if your battery is good and charged enough to power up the phone and also that the charging circuit at the connector is actually putting out a charging voltage.
