How to test for shorts on a breakout?
Clean the board with flux and let it shine
use a good magnifying lens to visually check if there are any shorts, especially between two pins of the module
Measure power supply pins with respect to ground to make sure there is no short waiting for first power on
check the assembly BOM again once more to see that all the components required to be mounted are indeed mounted (and also, components that are not supposed to be mounted are left open)
measure resistance values (you should be able to read approximately actual values, but not for all cases), at least they should not just read zero or Very less ohms..
Multimeter is your friend. Check neighbor IC pins one by one. Pin4 can be short with pin 5 or pin 3.. so, that can be performed for all the pins.
Check for diode polarity and capacitor polarity (if any)
Repeat the same test for the connectors
power on the board with current limited power supply