The side of the capacitor that your probe is touching in the image is the ground side, so it would always measure 0V. The other side should be 0.8V.

The 1.8V and 0.8V flow through each chip to the next, in this image the signal travels A -> B -> C. The 0.8V enters the ASIC at A, and exits the chip at B.



To make sure the connection is being made through the new ASIC you put down, measure the resistance between these two points indicated in the following image. The resistance should be less than 1 ohm.