You reach for your ROG Phone 9 mid-match or mid-scroll and the 6.78" AMOLED suddenly starts strobing, blinking, or showing faint flickering bands that were not there a minute ago. On a panel that usually looks rock solid, that wobble is unsettling, and it is hard to tell whether you are looking at a quick software hiccup or the start of a real display fault.
A browser based screen test cycles solid colors and gradients across the whole screen, which helps you confirm whether the panel itself shows the fault.
The good news is that most screen flicker on a phone like this clears up with a short, ordered set of checks before you ever need a technician. The fixes below run from the quickest and safest to the most involved, following ASUS's own troubleshooting guidance for screen flickering and abnormal display on its phones, with a couple of standard Android display toggles mixed in to help you isolate the cause. Work through them in order and stop as soon as the flicker disappears.
Restart the Phone, and Force a Restart if the Flicker Has It Frozen
Restarting is the quickest, safest move, and it is the one most likely to fix a temporary glitch. Powering the phone down fully and back up clears the cached display state and any stuck background process that may be driving the flicker, and it does this without touching any of your data.
If the flickering screen has frozen or stopped responding to taps, you cannot use the normal power menu, so you will need a hardware force restart instead. On the ROG Phone 9 the official sequence is the same one ASUS publishes for the ROG Phone 3 and later.
Press and hold volume down and power simultaneously for at least 8 seconds.
If it doesn't restart after 8 seconds, try pressing and holding both buttons for 12 seconds.
The phone will vibrate and reboot. Once you are back on the home screen, use it for a while to see whether the flicker returns. If it does, move on to the next step.
Install the Latest System Update
Outdated firmware can cause display abnormalities, and installing the latest build is part of ASUS's screen-flicker troubleshooting. System updates frequently include panel and graphics fixes that resolve flicker introduced by an earlier release, so it is worth checking even if you updated recently.
Open the updater and let the phone pull anything that is waiting. You may see either of these wordings depending on your build.
Go to Settings > System > System Update > Check now (also shown as Settings > System > System update > Check Update).
Follow the on-screen instructions to download and install any available update.
Keep the phone on the AC adapter, or keep the battery above 15%, while the update runs.
Let the phone reboot when prompted and finish applying the update. Once it is back on the latest build, watch the screen again before deciding whether you still have a problem.
Take Manual Control of Brightness and Adaptive Brightness
Some flicker tracks a specific brightness state rather than a fault, especially the subtle dimming that happens as the panel auto-adjusts to changing light. Taking brightness out of automatic mode lets you check whether the flicker only appears while the phone is ramping the backlight up and down. These are standard, no-risk Android display controls, though the exact labels can vary slightly on ROG UI.
Open Settings > Display (on some devices this reads Display & touch).
Tap Brightness level and move the slider to set the brightness manually.
Turn Adaptive brightness on or off and watch how the screen behaves in each state.
If the flicker eases once brightness is fixed manually, or only shows up while Adaptive brightness is active, you have learned something useful about when it happens. Note that ASUS's own flicker guidance does not list a brightness change as a documented cure, so treat this as a way to narrow down the cause rather than a guaranteed fix.
Switch On Dark Theme to Ease the AMOLED Panel
Because the ROG Phone 9 uses an AMOLED panel, switching on Dark theme changes how the screen drives its pixels, and on this type of display a darker interface can be easier on the eyes and may save power. Flipping it on is a quick, reversible test to see whether the flicker is tied to bright, light-heavy screens.
Open Settings > Display.
Turn Dark theme on (or off) and use the phone for a few minutes in that state.
If the flicker calms down with a darker interface, that is a helpful clue while you keep working through the list. As with the brightness step, this is a general Android toggle for ruling things out, not an ASUS-documented flicker cure, so do not stop here if the problem is still present.
Boot Into Safe Mode to Catch a Misbehaving App
A single badly behaved app, often an overlay, a screen recorder, or anything that paints over the display, can cause flicker that looks exactly like a hardware fault. Safe Mode loads Android with all third-party apps disabled, so it is the cleanest way to confirm whether software you installed is to blame. ASUS's troubleshooting steps include this test.
To enter Safe Mode while the phone is on:
Long press the power key.
Tap and hold "Power Off".
Tap "OK" on the Reboot to Safe Mode window.
If the phone is already off, long press the power key to boot it, then when the ASUS logo appears press and hold the volume down key until the home screen appears. Either way, the Safe Mode indicator shows at the lower-left of the screen.
Now use the phone normally for a while. If the device works normally in Safe Mode but flickers again after a normal restart, the problem is likely a third-party app, so uninstall recently added apps one at a time until the flicker is gone. When you are finished testing, restart the phone to exit Safe Mode and return to normal mode.
Back Up Your Data and Perform a Factory Data Reset
If the flicker survives an update, a Safe Mode test, and the display toggles above, ASUS's troubleshooting guidance directs you to back up your data and perform a factory data reset. This wipes a stubborn software state that the earlier steps could not clear, but it is destructive, so the backup is not optional.
ASUS warns that this reset will erase all data on your phone, and that all your installed apps, settings, and personal information will be removed, reverting the phone to its original factory state. Back up your photos, accounts, messages, and anything else you cannot afford to lose before you start. Keep the battery above 15% or stay plugged in, and expect the reset to take about 4 to 8 minutes.
You can run the reset from Settings, or use the built-in Recovery Mode if the screen is too unstable to navigate normally.
- 1.Power off the phone.
- 2.Press and hold Volume Up, then press and hold Power until the phone vibrates.
- 3.Use the Volume keys to select "RECOVERY MODE", then confirm with Power.
- 4.Select "Wipe data/factory reset" and confirm with Power.
- 5.Select "Yes".
- 6.Select "Reboot system now".
Let the phone reboot and set itself up again, then check whether the flicker is finally gone before you restore your backup.
When to Hand It to ASUS Customer Center
If the screen still flickers after a system update, a Safe Mode test, and a full factory reset, you have ruled out the common software causes. If the steps above cannot solve the issue, ASUS's guidance is to contact ASUS Customer Center for help. Flicker that persists through a clean factory state points to a hardware or display fault rather than anything you can fix from the settings menu.
At that point, reach out to ASUS official support or service rather than continuing to reset the phone. Have your model and any warranty details ready so they can arrange an inspection or repair, which is the right path for a physical panel problem.
Frequently Asked Questions
Will any of these fixes erase my data?
Restarting, updating the system, changing brightness or Dark theme, and using Safe Mode all leave your data intact. Only the factory data reset is destructive. ASUS warns that all data, apps, settings, and personal information are removed and the phone reverts to its factory state, so back everything up before you run it.
My ROG Phone 9 screen is flickering and frozen, so I cannot reach the power menu. What do I do?
Use the hardware force restart. Press and hold volume down and power simultaneously for at least 8 seconds, and if it doesn't restart after 8 seconds, hold both buttons for 12 seconds. The phone will reboot without losing your data.
How do I know if a downloaded app is causing the flicker?
Boot into Safe Mode, which disables all third-party apps, and use the phone for a while. If it behaves normally in Safe Mode but flickers again after a normal restart, the cause is likely a third-party app, so uninstall recently added apps until the flicker stops. Restart the phone to leave Safe Mode.
Does turning off the high refresh rate stop the flicker?
ASUS does not publish a refresh-rate or anti-flicker setting change as a documented fix for screen flickering on its phones, so this guide does not include one. Stick to the steps above, which are restart, update, the display toggles, Safe Mode, factory reset, and then contacting support.
The flicker is still there after a factory reset. Is the screen broken?
Flicker that survives a system update, a Safe Mode test, and a full factory reset usually indicates a hardware or display fault rather than a software issue. ASUS's guidance is to contact ASUS Customer Center for help at that stage so they can arrange service or warranty repair.