How does the tanker display flash?

When the customer is using the fuel dispensing machine, the display flashes. Look at the following:
1. If the display is flashing when standby, you need to change the display;
2. When the diesel fuel dispenser is working, the display flashes. First, it is not a problem with the motor. The motor cable does not go through the computer board, directly connected to the power supply, try the motor better and bad; secondly, remove the motherboard problem. Good, may be the motherboard problem, need to replace the motherboard.