V309 OBD2 car detector

Regarding the V309 OBD2 car detector, the screen cannot display a comprehensive repair problem, video tutorial
There is a cable connection at the connection between the screen and the motherboard. The screen backlight is normal, but the subtitles cannot be displayed. It is caused by the loosening of the cable. Reinstall according to the video to fix it! !
#V309 #OBD2 #Clearcarfaultcode #V310
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