I did my own board with STM32F429IGT6, and connect the ST-Link v3 using the ST-Link Utility. "No target detected". Previously I had made my own boards, and the minimum connection is Vcaps to 2.2uF capacitors, nRst with 10k pull-up, and Boot to ground.The boards worked fine. The device is not detected by the programmer. Already checked supply voltages and grounds. Also SWDIO and SWCLK wires.
PIN 124 (TMS_SWDIO) -> PA13 PIN 137 (TCK_SWCLK) -> PA14