1. Incomplete digital display

Due to the damage of the LCD liquid crystal display of the fuel dispenser, such as loose pins, broken pins, etc., just replace the LCD liquid crystal screen; if the logic chip of the display circuit is faulty, check whether the corresponding pin output signal of the corresponding chip is normal; Also, check the wiring and plugs to see if they are loose.

2. The characters are blurred

Check whether the cable is damaged, check whether there is a symmetrical square wave sent to the LCD liquid crystal. The solution is generally to first check whether the battery has power, if so, replace the display screen, if not, then check its peripheral circuit.

3. The displayed numbers do not change

Check whether the cable is in good contact, check whether the display signal sent by the motherboard is normal, if not, the motherboard is faulty, and then check whether the driver circuit integrated block is damaged.

4. The LED backlight block is not bright

There are two forms of backlight block not lighting up, one is that only one backlight block is not bright, this situation is generally because the backlight block itself is damaged or the resistance of its power supply is damaged or the connection cable is in poor contact, and the other is that all the backlight blocks are not bright. If it is not bright, then you should first check whether the backlight power supply is normal, and whether the display board power supply processing circuit is normal.

5. No display

Under normal circumstances, if there is no display on the LCD liquid crystal display of the fuel dispenser, you can check whether the power supply has power and whether the circuit link is loose, and replace the display.

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