Download ADB from cmd commend and go to the adb save folder that connect to device via Adb over TCP, if use Adb wire, skip this step

    adb connect {ip} for example:  adb connect

2. Take screen shot and save to device

    adb shell screencap -p /sdcard/0.png

3. Take the image from device to PC, 0.png would save to the current folder

    adb pull /sdcard/0.png