Repair iPhone 6 Plus Battery and Screen Problem
Has your iPhone 6 screen gone grey and unable to use it ?
Or the phone battery has a bit of a problem. Maybe you
think that you have to take the iPhone back to your
nearest Apple store to repair or replacement but that may
not be the case. Depending on what caused the screen to
go grey, one of these solutions may help you out. Now
Vip Fix Shop Team can help you.
Trouble Phenomenon:
The iPhone 6 Plus battery percent inaccurate, and often
reboot.
Repair process:
When we test the charging function, it shows normal, but
the battery power percentage jump frequently. Base on
repair experience, this phenomenon should be a reboot
frequently caused by battery failure, so we should repair
the battery power percentage inaccurate first.
So we connect iPhone to i4 tool, the position of battery
information shows no data, this failure is the CPU doesn't
recognize the battery, so i4 tool can't read the battery data.
As shown in picture 1-1.
The main reasons for not recognizing battery information
as follows:
1. The battery is damaged
2. The circuit from middle pin BATTERY-SWI of battery
interface J2523 to F2 of charging chip U1401 is broken
and the U1401 was damaged
3. The problem of circuit from U1401 G1 # to CPU AG4
# and problem with the CPU itself.
The schematic diagram is shown in picture 1-2.
Then we replace the new battery and test it, i4 tool still
can't read the battery information. Then measure the
diode data of battery middle pin with Multimeter, the
diode data is 380 which is normal, so the line from