Resistive touch is not detecting on beaglebone black with my power supply

Hello,
I have chipsee expansion board with 7" screen. I am using ubuntu 12.04 with 3.8.13-bone47 kernel. I have two power supply.One power supply is from MEAN WELL company. And another power supply is designed by me. With MEAN WELL power supply everything is working fine. Touch is also working fine. But when I connect my own power supply except touch everything is working fine. Output of my power supply is 5.00V 4.0A. I want to use my own power supply. What can be the problem with my power supply? Please help me to solve this problem. Thanks in advance.

Regards,
Kishor

An chance you can check how much voltage distortion your PSU provides? I know that very noisy PSUs can break up capacitive touchscreen easily