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The reason why the LED light on the TTF LCD screen does not light up
There may be various reasons why the TFT LCD screen LED light does not light up. The following are some common problems and their solutions: power supply problem: check if the power supply is connected correctly, ensure that the power adapter is working properly, and that the power supply voltage meets the requirements of the LCD screen.
Drive issue: If there is no power issue, it may be a drive failure. Devices such as constant current drivers, rectifiers, or voltage reducers in the driver may not be able to maintain the normal operation of the LED. You can try replacing the drive with a new one.
LED bead issue: LED beads may not light up due to burning out. If one of the lamp beads burns out, it may cause the entire string of lamp beads to not light up. If multiple strings of light beads have problems, it may be necessary to check the capacitance or resistance on the driver.
Level conversion issue: If the LCD screen is designed for microcontrollers with different voltages, level conversion may be required. For example, if the LCD screen is designed for 5V and the microcontroller outputs 3.3V, a level conversion chip is required.
Initialization issue: Ensure that the initialization code of the LCD screen is correct and error free. Sometimes, a small error in the initialization code can also cause the screen to not light up.
Pin configuration issue: Check if the pins of the LCD screen are correctly configured, including data, control, and power pins. Software issue: Check if the software or firmware controlling the LCD screen is loaded and executed correctly. Sometimes, bugs in software can also cause the screen to not light up.
Hardware damage: The LCD screen itself or other related hardware may be damaged and needs to be replaced.
Reset issue: If the LCD screen shows a white screen after power restart, it may be due to improper reset pin configuration. It is necessary to ensure that the reset pin is configured correctly and appropriate handling is carried out during initialization.
Backlight issue: If the backlight of the LCD screen is not lit, it may be due to damage to the backlight tube or a malfunction in the backlight driver circuit.
When solving these problems, it is usually necessary to use the domino test method to eliminate possible causes one by one until the problem is identified. If the problem is complex, professional technical support may be required.
AUO TFT LCD:https://www.auo-lcd.com/products/auo-lcd-screen/
TFT LCD:https://www.auo-lcd.com/
