How to Fix iPhone ProMotion 120Hz Not Working

If iPhone ProMotion 120Hz is not working, the usual fixes are disabling Low Power Mode, checking app support, updating iOS, and restarting the device. Many cases are not hardware failure. ProMotion uses an adaptive refresh rate, so the 120Hz display may drop lower during static screens, battery-saving states, or unsupported apps.

Steps

1. Turn off Low Power Mode

   Open Settings > Battery and disable Low Power Mode. Low Power Mode often limits refresh behavior and can cause a ProMotion not working complaint.

2. Check display and accessibility settings

   Open Settings > Accessibility > Motion and make sure Limit Frame Rate is off. If Limit Frame Rate is enabled, the 120Hz display is capped.

3. Test in supported apps and actions

   Scroll quickly in Safari, Photos, or system menus. Some videos, games, and third-party apps do not fully support ProMotion, which can look like an adaptive refresh rate issue.

4. Update iOS and restart iPhone

   Install the latest iOS version from Settings > General > Software Update. Then restart the device. Software bugs can affect refresh rate behavior after updates or app installs.

5. Reset settings if the issue continues

   Open Settings > General > Transfer or Reset iPhone > Reset > Reset All Settings. This removes misconfigured display, accessibility, or battery settings without deleting personal data.

Common Issues and Fixes

• Screen looks stuck at 60Hz — Likely cause: Low Power Mode or Limit Frame Rate is enabled. Fix: Disable both settings and retest in a system app.
• Only some apps feel smooth — Likely cause: app-level support is limited. Fix: Compare behavior in Safari or home screen scrolling before assuming hardware failure.
• 120Hz works sometimes, then drops — Likely cause: adaptive refresh rate is working normally. Fix: Test during fast scrolling, not on static pages or paused content.
• Lag after iOS update — Likely cause: temporary software bug or indexing activity. Fix: restart iPhone, update all apps, and wait until background tasks finish.
• Issue started after impact or screen replacement — Likely cause: hardware damage or non-genuine display parts. Fix: check repair history and have the display inspected by Apple or an authorized service provider.

Quick Tips

• ProMotion does not stay at 120Hz constantly. The system changes refresh rate based on content and power conditions.
• Screen recordings and some visual tests may not accurately show the real refresh rate.
• Certain battery or performance conditions can reduce refresh rate temporarily, even when settings are correct.
• A non-original display may support basic touch and brightness but still fail to deliver proper ProMotion behavior.

Related Questions

Why does iPhone ProMotion feel inconsistent?

ProMotion is dynamic by design. The system lowers refresh rate on static content and raises it during motion, scrolling, or animation.

Can a screen protector cause 120Hz display problems?

A screen protector usually does not disable ProMotion. A poor-quality protector may affect touch response, which can make scrolling feel less smooth.