Understanding that, What do the badges on the monitor mean?It allows you to instantly weed out 90% of false diagnoses about the breakdown of expensive equipment. Instead of carrying the equipment to the service, the user can independently check the integrity of the cable or switch the signal source, relying on the color indication. It is important to distinguish between Windows system messages and hardware notifications that are output directly by the display chip.
In this guide, we will analyze color coding in detail, decipher OSD-menu text messages and learn how to diagnose malfunctions by flashing indicators.
Color indication and modes of operation of the indicator
The first thing to pay attention to when diagnosing is the color and mode of operation. light-indicator (LED), usually located at the bottom of the frame. Electronics manufacturers use a single state encoding logic that allows you to quickly determine the status of a device without displaying an image on the matrix.
If the indicator is lit with a smooth blue or green light, this means a normal mode of operation when the video signal is received and processed correctly. The absence of an image with a burning indicator indicates a software failure in the OS or a dark background of the desktop, but not a connection problem.
When the indicator starts flashing blue or white, it is a signal to switch to standby mode (Sleep Mode). The computer sends a command to reduce power consumption, and the screen goes out. If the color changes to orange or amber, this is a classic sign of Standby mode, when the video signal is missing completely, but the power to the matrix is supplied.
- 🟢 Green or blue light is normal, there is a signal.
- 🔴 Red light – the device is switched off by the button but is on (or is charged in portable models).
- 🟠 Orange flashing - power saving mode, no video signal.
- 🔵 Fast blinking in blue often indicates an attempt to auto-search the source of the signal.
⚠️ Attention: If the indicator flashes red at a high frequency or emits audible signals (if there are speakers), this may indicate a critical power error or overheating of the internal electronics of the monitor.
Decoding pop-up messages (OSD) in the absence of a signal
Modern displays are equipped with a built-in controller that displays service information even without connecting to a PC. Most often, users encounter a floating window containing the text "Self-Test Feature Check" or "Check Signal Cable". These messages are generated by the monitor itself and are independent of the operating system.
The appearance of the inscription Check Signal Cable means that the device is on but does not receive data over the connected interface. This can be caused by a physical disconnection of the wire, a malfunction of the graphics card, or the fact that the computer is turned off. It is important to check the density of connectors in ports.
Message Self-Test Feature Check Often accompanied by a floating square or moving texture. This is a standard function that confirms that the matrix is intact and is able to display a picture. If the cable connects to the PC, this message disappears and the BIOS or Windows logo appears, then the technique is good.
Sometimes you can see a message. No Signal or Input Not Supported. The first indicates the absence of a signal, the second - that the resolution or refresh rate issued by the video card, beyond the technical capabilities of this screen model.
⚠️ Attention: Do not try to disassemble the monitor if artifacts in the form of colored stripes or ripples appear on the screen when there is a message "Self-Test". This is a sign of damage to the matrix or plume, requiring professional repair.
Interface and Connection Types Symbols
When switching between signal sources, graphical icons may appear on the screen indicating the active port. Understanding these symbols is necessary for proper configuration video source It's on the monitor menu.
The most common symbol is a rectangle with truncated corners, denoting HDMI. If you see this icon, then you have chosen a digital audio and video channel. Often, a port number, such as HDMI 1 or HDMI 2, can be displayed nearby, which corresponds to the physical sockets on the back.
A symbol resembling the letter "D" with dots inside or outside denotes the DisplayPort interface. It is a more modern standard, often used in gaming and professional monitors. A USB-C lightning icon indicates a connection via a universal port that can transmit video and power at the same time.
| Badge/Symbol | Interface type | Features of transfer |
|---|---|---|
| Rectangle with bevel | HDMI | Video + Audio |
| The letter D with dots | DisplayPort | High Hertzovka, Video + Audio |
| Trident | USB | Data (for USB hubs in the monitor) |
| Rectangle with 15 holes | VGA (D-Sub) | Analog video only |
If the screen is lit by a VGA icon (often a blue rectangle with holes), this means using an analog signal. The quality of the picture in this mode can be inferior to digital analogues, and desynchronization is possible, requiring manual adjustment through the menu.
Technical details of digital handshake
When switching sources, the monitor performs the “handshake” procedure, exchanging EDID data with the video card. If this process is interrupted, the interface icon may flash, indicating an attempt to reconnect.
Specific icons of gaming and professional models
Owners of specialized equipment can notice on the screen additional icons that are absent in office models. These symbols indicate the activation of special modes of the matrix, affecting color reproduction and response speed.
Often there is an icon in the form of a sight or cross. It indicates activation of the function. Aim Stabilizer Or similar, which helps to aim in shooters. This overlay is displayed over the main image and does not disappear when the window is changed.
The symbol of the eye or face outline denotes the mode of protection of vision (Low Blue Light). When activated, the color temperature decreases, and the screen acquires a yellowish tint. The helmet or helmet icon may indicate high contrast mode for dark scenes in games.
- 🎯 Sight - the game overlay for shooters is included.
- 👁️ Eye – activated the blue spectrum filtering mode.
- ⚡ Lightning – High refresh rate (e.g. 144 Hz) mode is enabled.
- 🎮 Gamepad – activated game profile of color settings.
Peripheral and USB hub icons
Many modern monitors are equipped with built-in USB hubs. When connecting the peripherals (keyboard, mouse, webcam) to the ports on the display case, the corresponding notifications may appear on the screen.
Badge USB (Tribell) usually pops up for a few seconds when you connect a new device. If the icon appears with an exclamation point or is crossed out, this means that the port is not activated or requires the connection of a “upstream” cable (USB Upstream) from the monitor to the system unit.
In professional models, you can find icons that indicate the connection of a docking station through Type-C. This allows the monitor to be used as a single connection point for a laptop, transmitting video, data and power through a single cable.
Sometimes a microphone icon with a cross-out appears, which indicates a software shutdown of the sound in the monitor if it is connected to HDMI/DP and is used as an audio output device.
Diagnostics of faults by error codes
Some advanced models, especially from the lineup Dell UltraSharp or BenQThey are able to deduce numerical error codes during self-diagnosis. These codes help to pinpoint the node that needs attention.
For example, the code may indicate overheating of the backlight or malfunction of the scaler board. Decoding such codes is usually contained in the service manual of a particular model, but the general principles of diagnosis remain similar.
If horizontal or vertical lines appear on the screen that do not disappear when switching to the settings menu, this is a direct sign. matrix defect Or a plume. It is impossible to solve this problem by software.
☑️ Checking for errors
⚠️ Attention: If after the appearance of a strange icon or error code, the screen goes out and stops responding to the on button, do not try to turn it on again many times in a row. Allow the equipment to cool for 30 minutes.
Resetting and calibration through the menu
If the icons on the screen behave incorrectly (stuck, do not disappear) or the image is distorted, it often helps to completely reset the monitor settings to factory values. This action does not affect the data on the computer, but only returns the brightness, contrast and input selection parameters to the original state.
To perform the reset, you need to find an item in the menu Reset All or Factory Reset. In some models, this requires clamping a certain button on the body when turned on. After the procedure, the monitor will restart, which can take up to a minute.
It is also worth checking the relevance of monitor drivers in the operating system. Sometimes Windows installs a “PnP Basic Driver” which may cause some management features to fail and icons in the system to appear as an unknown device.
Use the "Auto" button on the monitor body (if any) to automatically adjust the VGA analog signal. This often removes the jittery image and the "Out of Range" icon.
Frequently Asked Questions (FAQ)
Why does the HDMI icon flash but no image?
Blinking an HDMI icon usually means that the monitor is powered but cannot sync with the signal source. Check whether the computer is on, whether the cable sits tightly in the port, and whether the correct source of the signal (Input Source) is selected in the monitor menu.
What does the message "Out of Range" mean?
Message "Out of Range" indicates that the video card is sending a signal with a resolution or refresh rate that is not supported by this monitor model. You need to boot in safe mode and reduce the graphics settings.
How to remove the floating square "Self-Test"?
This square will disappear automatically once you connect a serviceable cable from the computer turned on to the monitor. If the cable is connected but the square is still there, check the graphics card or try another port.
Is it dangerous if the food indicator is on orange?
No, it's not dangerous. The orange color normally indicates standby, when the computer is asleep or off, and the monitor is ready to work. This is the normal behavior of energy-saving equipment.
Most icons on the monitor are not errors, but information messages about the status of the connection. Correct decoding of the color of the indicator and text message allows you to solve the problem in 2 minutes without calling the wizard.