Sorry picture reuploaded again with correct part numbers. as U2 is hall sensor a nd U1 is a MosfetOn your schematic the pins for T1/U2 seem to be out of order compared to the package on the pcb. The pin order for a TO220 is 1-2-3 from left to right. Compare the schematic connections to the data sheet and be sure you have them in the right order. The pins shown on a schematic symbol may not match the physical layout.