Customer fault report:
Customer attempted to open the iPhone to replace the battery. Origional screen would no longer work. Tried new screen but no longer has touch function.
In most instances of No Touch function on the 6s plus, the lines to look at are PP5V1_TOUCH_VDDH and PP1V8_TOUCH. If you have no faults on these lines the issue can be much worse. In this case the device was unrepairable.
Figure 1 is SPI_AP_TO_TOUCH_CS_CONN_L. This line is critical for touch function. If this happens to be shorted to ground and everything else appears to look visually good. The problem will lie under the CPU.