trying to locate short with bench ps

The way I find shorts is similar to how you are trying to do it. I have a 2 amp DC power supply similar to yours pictured. I start off with the voltage at 0v and slowly raise it till it trips my DC power supply(the two displays on my power supply will flash all zeros when it trips and also has a led indicator that will light up). I am not sure if your power supply has that function or not. I have my amp setting on 2 amps also. I am currently working on a shorted HTC One m7 motherboard and I was only able to supply 1.5v before tripping my power supply. So basically I start at zero volts and provide as much voltage as I can and once it trips the power supply I decrease the voltage until I am at the highest voltage the phone will take before tripping the PS. Once I have the voltage at the desired level I then check for heated components to locate any shorts. This method has worked well so far. If you locate and remove the bad component then you should be able to raise the voltage back up to 3.8v. If you can raise the voltage back to normal than its a good indication you have found the faulty component. Now replace with a good component and see if the device can function properly. Hope this helps you out.