why unity camera scrolling updates scene only after transition has finished?

I repost my question on stackoverflow in hope of having an answer.

I'm trying to make my camera scroll over my scene as the game starts (Something like an intro). here is the code attached to my main camera:

 using UnityEngine;
 using System.Collections;
 
 public class cameraScript : MonoBehaviour {
     public float camYLerpTime = 5000f;
     float camYInitPoint = 950f;
     public float camYEndPoint = 0f;
     float camPosY;
     //float camFieldOfViewStable = 170.5f;
 
     // Use this for initialization
     void Start () {
         camIntro ();
     }
 
     void LateUpdate () {
         if (transform.position.y!=camYEndPoint) {
             transform.position = new Vector3 (transform.position.x, camPosY, transform.position.z);
         }
     }
     void camIntro()
     {
         camPosY = Mathf.Lerp (camYInitPoint, camYEndPoint, camYLerpTime * Time.deltaTime);
     }
 }

However, I only see the rendered scene as transition is finished and the camera is in it's final position. What am I doing wrong?

Project settings: 2D Unity version: 5.1.2f1