MCP6002 op amp without Vss Vdd connected?
The MCP6002 (link to datasheet) contains two opamps.

They share the powersupply pins.  The second opamp doesn't need to have a power connection shown because the power pins are shown on the first opamp.

If the circuit doesn't work, the problem lies elsewhere.



Check that you have placed U2 properly - if you got it rotated by 180 degrees it won't work.

Follow all of the notes in the assembly guide.  I see that at least some versions had incorrect silk screening that could lead you to place parts incorrectly.