I am sorry you’re having personal problems, but so is everyone else. As far as standing behind your product, that would be your personal choice. I certainly can read a schematic. Assuming that pin 1 on U2 is the one with the square pad, then there is continuity between there and TP3. There is also continuity between TP4 and R5. I had already checked this but I’m not convinced it means that either OPAmp “A” or the LDR in the low Opto is functioning correctly.