Dark Phone Screen on Full Brightness: Causes and Solutions

A phone screen might appear dark at full brightness due to several reasons: power saving mode reducing brightness to save battery, malfunctioning adaptive brightness due to obstructed sensors, hardware issues with the display or GPU, software glitches, reduced visibility under direct sunlight, obstructions like dirt or poor-quality screen protectors, and a faulty ambient light sensor incorrectly adjusting brightness. This blog will answer for you the question: “why is my phone screen so dark on full brightness?

factors of screen brightness
The perceived screen brightness can be affected by various factors

Common Causes of Screen Darkness

Screen darkness even on full brightness on digital devices can stem from various sources, often linked to both software settings and hardware issues designed to optimize performance and extend battery life. One common feature that reduces screen brightness is the adaptive brightness setting, which adjusts the display luminance based on surrounding light levels to conserve battery power.

Additionally, power-saving modes can further dim the screen to extend battery life, which can be adjusted or disabled in the device’s battery or power settings. On the software side, glitches or bugs within the operating system or specific applications can lead to brightness problems. These issues are usually addressable through software updates, resetting display settings, or, in more persistent cases, performing a factory reset.

A failing display or a deteriorating battery can directly impact screen brightness, with symptoms ranging from flickering to significant dimming. These hardware-related issues may necessitate professional repairs or replacements, as they directly affect the device’s ability to maintain optimal screen visibility and overall performance.

screen brightness impacted by display And battery
A failing display or a deteriorating battery can directly impact screen brightness

Troubleshooting Steps

To diagnose and fix common causes of a dark screen on full brightness on both iPhone and Android devices, follow this step-by-step guide:

troubleshoot dark screen
Step-by-step guide to diagnosing and fixing common causes of a dark screen on full brightness

For iPhone Users:

Check Brightness Settings:

  • Navigate to Settings > Display & Brightness.
  • Ensure the brightness slider is adjusted to the maximum or your preferred brightness level.

Disable Auto-Brightness:

  • Go to Settings > Accessibility > Display & Text Size.
  • Scroll down and turn off the Auto-Brightness feature.
turn off Auto Brightness
Disable Auto Brightness

Turn Off Low Power Mode:

  • Access Settings > Battery.
  • Toggle off Low Power Mode to prevent it from automatically dimming your screen.
disable low power mode
Turn Off Low Power Mode

Adjust True Tone and Night Shift:

  • In Settings > Display & Brightness, you can toggle off True Tone and Night Shift, as these features can alter screen brightness and color temperature.
true tone and night shift adjustment
Adjust True Tone And Night Shift

Restart Your iPhone:

  • Press and hold the side and volume buttons until the power off slider appears. Slide to turn off, then press the side button to turn your iPhone back on.
restart your own iPhone
Restart Your iPhone

Update iOS:

  • Ensure your device is running the latest version of iOS by going to Settings > General > Software Update.
iOS update
Update iOS

Reset All Settings:

  • If the issue persists, try resetting all settings by going to Settings > General > Reset > Reset All Settings. Note: This will not erase your data but reset system settings like Wi-Fi passwords and wallpaper.
reset all settings
Reset All Settings

For Android Users:

Adjust Brightness Settings:

  • Open Settings > Display > Brightness level and adjust the slider to the maximum or your desired level.
brightness adjustment
Adjust Brightness Settings

Disable Adaptive Brightness:

  • In the Display settings, look for Adaptive Brightness or Auto-Brightness and switch it off.
adapted brightness disable
Disable Adapted Brightness

Turn Off Battery Saver Mode:

  • Go to Settings > Battery > Battery Saver and turn it off to prevent automatic screen dimming.
disable battery saver mode
Turn Off Battery Saver Mode

Check for Software Updates:

  • Ensure your device is up to date by going to Settings > System > System Update.

Restart Your Android Device:

  • Hold down the power button, then select Restart. If your screen is unresponsive, hold the power button until the device restarts.

Reset Display Settings:

  • Some Android devices allow you to reset display settings specifically. Check under Settings > Display for a reset option, or use the search function in settings.

Factory Reset:

  • If all else fails, consider a factory reset as a last resort. Back up your data first, then go to Settings > System > Reset options > Erase all data (factory reset).
erase all data
Factory Reset

Preventing Future Issues

To ensure the optimal brightness and health of your device’s screen, consider the following tips:

  • Regular Software Updates: Always keep your device updated with the latest software version to fix bugs and improve performance.
  • Protective Measures: Use a protective case and a screen protector to safeguard against physical damage from drops and scratches.
  • Avoid Extreme Conditions: Keep your device away from extreme temperatures and moisture to prevent damage to the screen and internal components.
  • Careful Handling: Avoid applying pressure to the screen and keep sharp objects away to prevent scratches and cracks.

Seeking professional repair is advisable when facing persistent screen issues like flickering, unusual lines, significant discoloration, or inability to adjust brightness, indicating potential hardware failure. Visible damage from impacts also requires expert attention. These signs suggest problems beyond DIY solutions, necessitating professional help to prevent further damage and ensure device longevity.

get advice from professional
Seeking professional repair is advisable


Why is my phone screen so dim even at full brightness?

If your phone screen remains dim at full brightness, check if Auto-Brightness or Adaptive Brightness is enabled, as it automatically adjusts the screen based on ambient light. Also, ensure that Power Saving Mode is turned off, as this can reduce screen brightness to save battery.

How can I fix the flickering screen brightness on my phone?

Screen flickering can often be resolved by restarting your phone. If the problem persists, try updating your device’s software to eliminate any bugs causing the flickering. If updates do not resolve the issue, consider resetting your phone’s settings or seeking professional repair.

What should I do if I can’t adjust my screen brightness?

First, restart your phone to see if it resolves the issue. If not, check if the brightness adjustment slider is functional in your settings. If the problem continues, it may be a software glitch that could be fixed with an update or a hardware issue requiring professional repair.

How do I stop my brightness from dimming?

Disable Auto-Brightness: This feature adjusts screen brightness based on ambient light. Here’s how to disable it:

  • Settings > Accessibility > Display & Text Size
  • Toggle “Auto-Brightness” to off.

Check True Tone (if applicable): This adjusts screen color temperature to match your environment. You can disable it:

  • Settings > Display & Brightness
  • Toggle “True Tone” off.

Check for Low Power Mode:  This mode saves battery by reducing brightness, among other things. Disable it:

  • Settings > Battery
  • Toggle “Low Power Mode” off if it’s currently on.


Identifying the cause of why is my phone screen so dark on full brightness? is essential for ensuring your device’s optimal performance and durability. Whether it’s a simple setting adjustment, a software update, or a hardware issue, pinpointing and addressing the problem quickly is key to restoring screen brightness and function. Prompt action not only improves your experience but also prevents further damage, prolonging your device’s lifespan.

Phone Repair Centre

Address: 21/268-274 Springvale Rd, Springvale VIC 3171

Phone: (03) 85130380

Email: info@repaircentrevic.com.au

Website: https://repaircentrevic.com.au