The location of the Vivo Y71 PD1731F pinout test point is seen after you scrape the foam near the battery connector. Remove the battery connector → connect the two dots marked in the picture using tweezers → connect the mobile to the PC using a USB cable. Wait a few seconds and open the Device Manager on your Windows, look in Ports and the device should be detected as Qualcomm HS-USB QDLoader 9008. If not detected, install Qualcomm USB Drivers for Windows, check the USB cable, and check the plugin connector.
The Test Point on the Vivo Y71 is performed if it fails to bring the phone to EDL mode using the keys (Volume Up + Volume Down + Connect the mobile to the PC).