Step 1: Check Battery Voltage
Check if the battery voltage is too low or too high. If it is, consider charging or replacing the battery.
Step 2: Test the Display
Determine if the display is not functioning properly, such as having button issues.
Step 3: Change the Display and Inspect Connections
If the display is faulty, replace it with a new one and see if that resolves the issue. If not, examine all connecting wires for damage or loose connections.
If you have checked all these issues and the display still doesn’t work, the problem may lie with the controller.