My Lenovo Thinkpad E420qq voice video chat microphone has no sound.

1. Open the QQ chat window, select the microphone icon in the upper right corner, and right-click "Voice Settings";

2. Cancel the check boxes for automatically adjusting the microphone volume and automatically amplifying the microphone volume;

3. Click the speaker in the lower right corner of win7 with the right mouse button, and then select "Recording Device" in the pop-up menu;

4. Select the "Recording" tab in the sound setting panel of Windows 7, and double-click the current microphone device;

5. In the pop-up setting panel of Microphone Properties, select the "Level" tab, and slide the microphone and microphone enhancement to the highest level, so that the other party can hear their own voice and solve the problem.