Check these first
Do not assume the cause from the symptom alone. First determine whether the issue affects the whole phone, one app, one connection, or one accessory. Work from low-impact checks toward recovery or repair.
- Check whether calls, vibration, alarms, or notification sounds still work
- Remove a case or protector that may obstruct buttons or sensors
- Note whether the issue began after a drop, liquid exposure, or extreme temperature
Critical diagnosis for this symptom
Use sound, vibration, charging response, and external output to separate display failure from boot failure.
Do not repeatedly enter a passcode when the display cannot be verified.
Escalate with device, OS, error, and reproduction details when the issue persists after restart, controlled comparison, and update checks, or when physical damage, abnormal heat, account suspension, or carrier provisioning is suspected.
Narrow down the cause
| Scope of the issue | Where to check next |
|---|---|
| Only one app is affected | Check app permissions, updates, storage, cache, and reinstall options |
| The whole phone is affected | Check restart, system updates, free storage, and system settings |
| Other devices have the same issue | Check the network, service, charger, or accessory |
| The issue began after a drop or liquid exposure | Avoid repeated power or charging attempts and contact official support |
See the troubleshooting flow
Safe step-by-step process
Complete one step at a time and test after each change. Do not change several settings at once.
- 1Move to a dim room and try increasing brightness through a control panel, accessibility shortcut, or voice assistant if available.
- 2Connect a known-good charger and leave the phone for about 30 minutes. Test another cable, adapter, and outlet.
- 3Use the manufacturer procedure for a forced restart. A forced restart is not the same as a factory reset.
- 4Connect the phone to a computer and check whether it is detected. If it is, create a backup before attempting recovery.
- 5Shine a light across the display and look for a faint image. A faint image can indicate a display or backlight hardware fault.
- 6If the phone was dropped or wet, or the screen remains black after restart, stop repeated power attempts and contact official repair support.
Actions to avoid
- Repeatedly tapping passcodes or erase confirmations on an invisible screen
- Bending, striking, or pressing hard on the display
- Charging immediately after liquid exposure
Prevent the issue from returning
- Keep automatic cloud or computer backups current
- Use impact protection and avoid extreme heat or direct sunlight
Frequently asked questions
What if my screen looks different?
Menu names and locations vary by OS, manufacturer, model, region, and software version. Use the Settings search field and check the manufacturer guide for your exact model.
When should I stop troubleshooting?
Stop as soon as the issue is fixed. Change one setting at a time so you can identify what solved the problem and reverse it if necessary.
What should I do if the issue remains?
Record how to reproduce it, verify your backup, and contact the manufacturer, carrier, or app provider most closely related to the problem.