What to do if the LED screen is white

The white screen of the LED screen indicates that the backlight panel can work normally. First, determine whether the motherboard can work normally. Press the power switch and check if the indicator light responds. If the light can change color, it means the motherboard is working properly.
1. Check whether the connection line from the main board signal output to the screen is in poor contact (you can replace the connection line or the screen).
2. Check whether the voltage of each working point of the main board is normal, especially the power supply voltage of the panel.
3. Check the line field signal and clock signal (from input to output) with an oscilloscope.

If the LED screen indicator does not respond or light up, it means that the motherboard is not working properly.
1. Check the voltage of each working point of the main board, pay attention to the EEPROM voltage (about 4.8V), the reset voltage (high level or low level, depending on the model), and the MCU voltage. If the power supply is shorted, look carefully for the location of the short, which may short the printed circuit board copper foil.
2. Find out if the MCU pins are in good contact with the motherboard.
3. Check whether the motherboard chip and the single-chip microcomputer work, and use an oscilloscope to measure whether the crystal oscillator starts to vibrate.
4. Replace the microcontroller or re-program the microcontroller if necessary. Enbon