truth_arr = array([[ True, False, False,  True],
                   [False,  True, False, False],
                   [False, False,  True,  True],
                   [False, False, False,  True]])

[(0, 0), (0, 3), (2, 2), (2, 3)]

np.nonzero(truth_arr * truth_arr.sum(axis=1, keepdims=True)>1)
# (array([0, 0, 2, 2]), array([0, 3, 2, 3]))