| Problem (Symptom) | Likely Cause | What to Check |
| Won't Turn On | Battery Discharged | Charge iPhone for at least 10 minutes |
| Won't Turn On | Firmware Crash | Perform a forced restart to fix firmware crash |
| Won't Turn On | Bad Battery | Check if iPhone turns on when plugged; battery may be degraded |
| Speaker Issues | Volume Turned Down | Turn up the volume using the button or through the phone's software |
| Speaker Issues | Phone Case Obstructing Speaker | Remove the case and test the speakers again; remove screen protector if it obstructs the earpiece speaker |
| Speaker Issues | Software Glitch | Turn off Bluetooth, perform a forced restart; rule out software issues |
| Speaker Issues | Broken Receiver | Check if sound issues are during calls; utilize Apple's service program or follow the iPhone 12 Earpiece Speaker replacement guide (Note: FaceID may be disabled) |
| Speaker Issues | Broken Speaker | Clean speaker holes; if ineffective, follow the iPhone 12 Loudspeaker Replacement guide |
| Unresponsive Screen | Operating System Freeze | Perform a force reset |
| Unresponsive Screen | Broken Digitizer | Replace the entire display assembly; follow the iPhone 12 Screen Replacement guide |
| Text Problems | Software Glitch | Restart the phone; reset network settings; toggle iMessage and MMS settings |
| Text Problems | Network Hangup | Reset network settings; toggle iMessage and MMS settings; contact service provider if necessary |
| Camera Not Working | App Malfunction | Use default camera app; close background applications; restart phone |
| Camera Not Working | Camera is Obstructed | Ensure the lens is not blocked; clean the lens with a microfiber cloth |
| Camera Not Working | Software Outdated | Update iOS; turn off VoiceOver; fix Flash Desynchronization Glitch; perform DFU reset |
| Camera Not Working | Broken Camera Module | Follow the iPhone 12 Rear-Facing Cameras Replacement guide |
14 Comments
Iphone12 unable to connect to carrier, how do you trouble shoot for this issue. NONE of the simple fixes work, reset, airplane mode on/off, restart, update software, clean SIM card, etc. Apple said the phone is bad, but did not indicate what part is bad. Now what?
penny - Reply
I am currently working getting an iPhone repaired. The problem is the display won’t show anything and there is no visible damage to it at all. I have replaced the battery and when I touch the cover of the display cable it is fairly warm. What could be the issue
Gibson Marshall - Reply
Excellent article ! Thanks a ton - it has been a lifesaver for the iPhone ! Especially on the note on what to do if it is a firmware crash.
Raj Kumar S - Reply
I have issue with face recognition not working
sanad alshehhi - Reply
Como desbloquear un iPhone si me lo encontré en la calle pero esta bloqueado
Smg1 - Reply