Use your tweezers to touch the and a Ground (any metal shield/housing) at the same time.
To access the test point, you must carefully disassemble the device. Note that the LG K52 (model LMK520) typically features a MediaTek Helio P35 processor, though some regional variations may differ. lg k52 test point
The LG K52 has a plastic unibody design, but the back cover is removable with heat. Use your tweezers to touch the and a
If the phone is still functional and you just need to perform internal diagnostics, use the built-in software testing mode instead of hardware pins: Open the Phone dialer. lg k52 test point