Табл.1 IPhone malfunctions
| Problem | Indicators | What to do |
| iPhone won’t turn on (apple / reboot) | ||
| Battery | U (voltage) < 3.8 В | Charge or replace the battery |
| С (capacity) < 80 % | Replace the battery | |
| Power Button Flex ribbon cable | The phone does not respond to pressing the power button. | Replace the Power Button flex ribbon cable |
| iOS | “Hanging on the Apple”: the Apple logo on the screen. | Reinstall iOS. |
| Front camera Flex ribbon cable | The proximity sensor does not work, the front camera does not work, the microphone does not work | Disconnect the front camera flex ribbon cable and reinstall the iOS without a “front camera”. Replace the front camera flex ribbon cable. |
| Tristar chip | There is no consumption on the diagnostic unit. Not detected by the computer. When you install a serviceable battery the phone is quickly discharged. | Replace phone charge control chip (U2) |
| NAND Flash | Error ‘4013’ and apple / reboot | Replace NAND Flash chip (phone hard drive (USB flash drive/memory)) |
| The main power controller | Won’t turn on | Replace the main power controller |
| Deformation of the phone body | Won’t turn on | Interlayer short circuit |
| Moisture inside the phone | Won’t turn on | Troubleshooting on the board (may be faulty chips, their binding or short circuit) |
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