JMQ A6X - The Electronic Watch Has no Display; Other Problems and Troubleshooting

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whether the buttons are working；
1.2 Check or replace the electronic board；
1.3 Check the button can be worked after the power is turned
back on .
2. The electronic watch has no display
Troubleshooting methods：
2.1 Check if the input voltage is within the allowable range：AC
200-240V；
2.2 Check if the switch on the electric running machine is turned
on.；
2.3 Check if the fuse inside the power outlet is blown. If it is blown,
replace it with a spare fuse；
2.4 Check the controller, if LED is lit；
2.5 Check each cable；
2.6 Check or replace the electronic board；
2.7 Check or replace control board.
3. Other problems and troubleshooting
a. The treadmill cannot start
Check if the power plug is plugged in, the power switch is turned
on, and the safety switch is removed.