话筒测试对准喇叭吹气在听筒里听到声音表示正常这时候会黑屏按开关机键即可恢复
When testing the microphone, aim at the speaker and blow air. If you hear a sound in the receiver, it indicates normal. At this time, the screen will go black. Press the power button to restore it
以上为机器翻译结果，长、整句建议使用 人工翻译 。