  The nature and symmetry of the superconducting gap function in the
noncentrosymmetric superconductor (NCS) Li2Pt3B, even many years after its
discovery, appears to be full of contradictions. In this letter based on the
existing band structure calculations we find that owing to the considerable
nesting near the Fermi surface and the enhanced d-character of the relevant
bands that cross the Fermi level,the system gets somewhat strongly correlated.
Considering the effect of the onsite Coulomb repulsion on the pairing potential
perturbatively, we extract possible superconducting transition. The strong
normal spin fluctuation gives rise to a singlet dominant gap function with
accompanying sign change. Thus our theory predicts a $s_\pm$ wave gap function
with line nodes as the most promising candidate in the superconducting state.
