It has been experimentally shown that, in the vicinity of an electrical contact through a micropore in a dielectric film with a flat electrode (microcontact) to a layer of planar-oriented nematic liquid crystal with positive anisotropy of permittivity, the optical response in the case of applying an alternating voltage with a constant bias does not match the classical reorientation of molecules in the Fredericksz effect. Restoration of the planar molecule orientation and relevant phase retardation increase in the direction radial to the microcontact may be caused by the electric field decrease due to the influence of the bulk electric charge accumulated as a result of injection from the microcontact. Keywords: Fredericksz effect, ion injection, phase retardation, wavefront.