The first green dot has not turned black in the process of positioning calibration?

The first green dot has not turned black in the process of positioning calibration?

First check if the indication light on the signal receiver is flashing continuously, if yes, that means the signal receiver is disturbing by a light source. Try repositioning the receiver.of Alternatively, it may be due to improper installation position of the signal receiver or ther receiver is positioned too close to the screen.
 
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