Change this part if your touch behaves erratically (ghosting) or non responsive after a physical drop, electric short or water damage.  Please check if your touch connector is not physically damaged and all pins are not bent or corroded then this is the part you want to change to fix your touch screen.

Change this quartz can help fix digitizer touch problems.  please note this may not be the only problem part when you have touch screen problems, this is just one of the weak link component in touch function control.