I have a circuit that provides power (1.8VD) to an FPGA and some ADCs. I have seen in the past where damage (ESD, EOS, etc) occurs to one of the ADCs. This causes a short from 1.8VD to GND internal to the ADC, which can be measured. The FPGA and PROM device are connected to this 1.8VD supply. Therefore, when 1.8VD is shorted to GND, the FPGA doesn't startup correctly.
I have seen a few of these boards when powered on, do not measure 1.8V but measure around 0.1V. However, when I measure the resistance from 1.8VD to GND, it appears nominal and no short is measured.
Is it possible that the ADC isn't fully shorted internally but still can hold this voltage rail down? Any thoughts, comments or insight would be helpful. I also suspect it is possible that they ADC is shorted internally to some other signal or plane other than GND.