REF02 not working - 4 channel 5v DAC circuit, star gnd connection, stripboard layout
According to your circuit, you have +15 volts (presumably coming from some type of power supply) connected directly to Vin of the REF02.  You say you measure only 0.35 volts at Vin.  Obviously, something is wrong here. You need to check that the +15 volts is present at the board and then check the wiring to Vin of the REF02 which means both the Vin wiring and the GND wiring. If the REF02 is working outside the board then it is not loading the +15 volts. Something else is going on.