- Be sure that the USB cable is the original one (not all USB cables let the instrument charge)

- Control that the charger is working: try to use the charger to charge a different device in order to verify it works.

- Try to use another different charger (it must be 4 Amperes or more required) and verify if it charges the instrument.

- The battery was completely empty? please apply the procedure explained above (whaile charging the display does not flash).