按确认键进入液晶、背光测试，如图8、图9、图10。检查液晶显示有无缺笔

Press the confirm key to enter the LCD and backlight test, as shown in Figure 8, Figure 9, and Figure 10. Check the LCD display for defects such as missing pens and broken pens. If the display is normal, press the OK button, as shown in Figure 11, to enter the clear security interface, as shown in Figure 12. Unplug the USB cable.

Press the confirmation key to enter the liquid crystal, backlight test, Figure 8, Figure 9, Figure 10. Check the LCD display whether there are missing pens and broken pens and other bad, if the display is normal then press the confirmation key, Figure 11, into the clean security interface, Figure 12, pull out the USB cable.

Press the confirm key to enter the LCD and backlight test, as shown in Fig. 8, FIG. 9 and FIG. 10. Check whether the LCD display is defective, such as missing pen and broken pen. If the display is normal, press the confirm key, as shown in Figure 11, to enter the clear security interface, as shown in Figure 12, and pull out the USB cable.<br>