iPhone battery symbol not charging
Plauged with an iPhone 5, iPhone 6, or 6S that does not charge even after a battery replacement and/or a new charger port install?
This may be the result of a charging ic on the motherboard typically referred to as the U2 or tristar.
This issue is normally caused by using cheaper third party charger that does not regulate the voltage and as such spikes in the voltage will ruin the charging integrated circuit.
Charging your iPhone using a third party charger or USB lead that does not regulate this as much allows for larger variables in voltage and current, this then damages the U2 IC and can leave you with a seemingly dead iPhone. Another common reason for this is also charging your iPhone from the cigarette lighter of your car. This does not regulate the voltage as well as the original AC adapter as the power is coming from the alternator. If you need to charge our iPhone or any electrical equipment in your car we would recommend a good quality inverter with your original charger and USB lead.
Having a phone that won’t charge or turn on is one thing, but knowing that there’s a chip inside that’s damaged and preventing it from turning on is an entirely different frustration. But, knowing is half the battle, both when it comes to the cables being used and the steps needed to fix it. Did you ever suffer from an iPhone that wouldn’t turn on, or charge over 1%?
Take a look at Micro Soldering Repair's write-up about this issue: