We do incoming inspections on the PCB and we are having troubles with
identifying if variations in the LPI layer is acceptable. We are having a
problem with coverage on the Vias. I
have a customer who specifies the vias are plugged and tented. I am getting
boards with a copper color at some of the vias. I have tried to solder and
it
will not take the solder but using a DMM the via is not electrically
isolated. I am not sure if this is a problem or not. Is a board in IPC
compliance
with out electrical isolation of a plugged and tented via?
The tenting is to be done with the LPI layer and appears to be very thin
on some vias. We are not trying to solder to them I just tiring to find out
if it is a defect. The thing that does not make sense to me is the
conductivity to the via.

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