The sudden disappearance of colors from the screen of your smartphone can plunge even an experienced user into a stupor. When the familiar interface Android turns into a dull black and white picture, the first thing that comes to mind is a serious hardware failure of the display or video card. However, in the vast majority of cases, the problem does not lie in physical damage to the matrix, but in incorrect software settings or activated energy saving functions.
Before taking the device to a service center, it is worth conducting a thorough diagnosis of the software. The system Android has many hidden menus and accessibility options that can radically change the color scheme. Often, users themselves accidentally activate the "grayscale" mode by pressing a key combination or changing parameters in the developer settings.
In this article we will analyze all the possible causes of color loss, from simple switches in the menu to complex hardware tests. You will learn how to restore the brightness and richness of the image using the built-in tools of the system, and understand in which situations the intervention of specialists is really required.
Checking the battery saving and sleep modes
The most common reason why the screen turns black and white is the activation of aggressive power saving modes. Smartphone manufacturers such as Samsung, Xiaomi or Huaweiare introducing features that switch the display to monochrome mode to extend battery life. Usually this happens automatically when the charge level drops below a critical level, for example, 10% or 15%.
To eliminate this factor, you need to go to the main settings of the device and find the section responsible for the battery. In some shells, this feature may be called "Ultra Power Saving" or "Survival Mode". If this mode is active, the system limits the operation of background processes and, which is important for our topic, disables color image transmission to the matrix.
⚠️ Attention: In some smartphone models, the power saving mode blocks the ability to change the brightness and color temperature settings until the device is connected to the charger.
It is also worth checking Digital Wellbeing settings. Modern versions Android include a "Sleep Mode" or "Bedtime" function that can automatically turn on grayscale at a user-specified time. This is done to reduce the attractiveness of the screen and help the user fall asleep faster. If you notice that colors disappear only in the evening or at night, the reason lies right here.
Accessibility and accessibility settings
The "Accessibility" section in the system Android is designed to help people with visual impairments, but its settings often cause problems with color rendering for ordinary users. Here is the “Color Correction” or “Grayscale” switch, which forcibly changes the display palette.
To disable this function, you need to follow the path Settings → Accessibility → Improve Visibility. Depending on the version of the operating system and phone model, the names of the items may differ slightly. For example, on a clean Android it may be the "Color Correction" item, and in the shell One UI from Samsung - "Improve Visibility."
Make sure that the "Color Correction" switch is selected is in an inactive position. If it is enabled, check the selected mode. In addition to complete bleaching, there may be modes active for deuteranomaly, protanomaly, or tritanomaly, which distort colors for people with color blindness. Disabling this option should instantly return natural color reproduction.
- 🔍 Check the "Zoom" section - sometimes the overlay of scaling filters conflicts with the color gamut.
- 🎨 Make sure that the "Invert Colors" mode is not activated, which makes the image negative.
- 👁️ Disable any recently installed third-party accessibility services; they may be hijacking display control.
If you can't find the switch you need, use the settings search by typing "color" or "accessibility" - the system will prompt you for the menu item you need.
Developer mode and USB debugging
More A complex cause of color loss can be accidental activation of debugging functions in the developer menu. This section is hidden by default, but if you previously enabled it to transfer files or debug applications, you may have affected the color space simulation settings.
Go to Settings → System → For developers. If this item is not in the menu, it means that developer mode is disabled, and you need to look for the reason elsewhere. If the item is present, scroll down the list to the “Hardware rendering acceleration” or “Monitoring” section. We are interested in the item “Simulate color vision anomaly” (Simulate color space).
By default, this item should be set to “Disabled”. If "Full Deuteranomaly" or "Monochrome" is selected there, the screen will appear faded or black and white. Change the value to "Disabled" and check the result. Also in this section, you should pay attention to the “Minimum width” item - too high values can break the interface layout, although they rarely affect the color.
⚠️ Attention: Be careful when changing the settings in the developer menu. Unjustified changes in rendering parameters can lead to unstable system operation or reboots.
☑️ Diagnostics of developer mode
Hardware problems and display testing
If software methods did not help return the colors, the problem may be hardware in nature. Damage to the display cable, oxidation of contacts after exposure to moisture, or physical shock can lead to loss of the signal responsible for transmitting color information. In such cases, the image remains, but loses color.
For diagnostics, you can use the engineering menu or special codes that most manufacturers have. Enter the code in your phone #0# (relevant for Samsung and many other brands) or ##6484## (for Xiaomi). In the menu that opens, select the screen test (RGB Test).
The test will consistently show red, green and blue colors on the entire screen. If at any stage the screen remains black or gray, or streaks and artifacts are visible, this is a direct sign of a malfunction of the matrix or display controller. It is also worth carefully inspecting the case for signs of a fall or water ingress.
| Symptom | Probable cause | Solution method |
|---|---|---|
| The screen is black and white only when the charge is low | Mode energy saving | Charge the phone, turn off the mode in the settings |
| Colors disappeared after falling | Display cable failure | Disassembling and reconnecting the cable in the service |
| Black and white image in certain applications | Accessibility or theme settings | Check the settings of a specific application |
| Stripes on the screen during the RGB test | Physical damage to the matrix | Replacing the display module |
In situations where the RGB test shows incorrect display of primary colors, independent repairs without special equipment and skills can aggravate the situation. An attempt to replace a cable at home without experience often leads to a break in the thin tracks inside the connector.
What is an RGB test?
The RGB test is a diagnostic procedure in which the screen is alternately filled with pure red, green and blue. This allows you to identify dead pixels and problems with the transmission of color channels. If one of the colors is not displayed or looks dull, then the problem is in the hardware.
Third-party applications and themes
Sometimes third-party apps installed by the user become the culprits for changing the color scheme. Book reading applications with night mode, blue light filters or launchers can overlay their layers on top of the system interface, discoloring the picture.
Remember what applications you installed shortly before the problem appeared. Try removing recently downloaded apps, especially those that have "on top of other windows" permission. Also check your installed themes. Some custom themes can forcefully change the system palette.
Try to boot the device in safe mode. To do this, you usually need to hold down the power button, and then hold down the “Power off” item on the screen for a long time until you are prompted to switch to safe mode. If the colors are restored in this mode, then the problem is caused by one of the installed applications.
- 📱 Remove all blue light filter or "vision protection" applications.
- 🎨 Reset the theme to the standard system one.
- 🧹 Clear the cache of problematic applications through the menu settings.
⚠️ Attention: Interfaces and names of menu items may differ depending on the version of Android and the manufacturer’s shell (MIUI, One UI, ColorOS). If you do not find an exact match, look for sections with similar meaning.
If the colors return in safe mode, the problem is 100% software and caused by third-party software, and not a phone breakdown.
Reset settings and extreme measures
When none of the above methods help, the last software option remains - a complete reset to factory settings. This action will erase all user data, applications and settings, returning the phone to a "store like" state. Before doing this, be sure to back up your important data to the cloud or to your computer.
You can perform a reset through the menu Settings → System → Reset settings → Delete all data. After rebooting, the phone will be clean. If even at the initial setup stage (selecting a language, connecting Wi-Fi) the screen remains black and white, this is concrete evidence of a hardware malfunction.
In this case, you must contact an authorized service center. The technicians will diagnose the cables, the power controller and the matrix itself. The display module may need to be replaced or the board repaired. Do not try to heat the screen or knock on the case - these “folk methods” will only kill the device.
How to make a backup before resetting?
Use the built-in Google backup function or the manufacturer’s proprietary utility (for example, Mi Cloud for Xiaomi or Samsung Cloud). Be sure to save photos, contacts, and a list of installed applications.
Frequently asked questions (FAQ)
Why did the screen turn black and white after updating Android?
The system update may have reset some settings or activated new features by default. Most often this is a power saving mode or accessibility settings. Check the "Battery" and "Accessibility" sections first.
Can a virus turn the screen black and white?
The direct effect of viruses on color reproduction is rare, but possible. Malware can change system settings or apply filters. Scan your device with an antivirus and remove suspicious applications.
Black and white screen only in photos, there are colors in the menu. What should I do?
This is a problem with a specific gallery application or camera settings. Check the filtering settings inside the photo app, reset the app settings, or update it.
Will calibrating the screen help restore color?
Calibration helps adjust shades, but will not restore color if Grayscale mode is enabled. First, turn off monochrome mode in the settings, and then calibrate the colors if necessary.
The phone fell into the water and the screen turned gray. Is this a repair?
Yes, this is a sign of oxidation of the contacts or damage to the display controller due to moisture. Professional cleaning of the board and diagnostics at a service center are required. It is dangerous to turn on such a phone.