Not Happy with repair of my phone

my phone \samsung S4"went in to a boot up loop about 2 days ago. my phone is still under warranty with 1 adh repair remaining. <br> <br> I took my device in this morning for repairs. I was told that the main board needed to be replaced. my screen had also slight damage to if from wear and tear. <br> <br> I was told that they will use the ADH to repair my main board on the device and that they cannot repair/replace my screen. <br> <br> ADH was suppose to cover screen and water damage. why was my main board not covered by the warranty???? <br> <br> Now I have no more ADH repairs available and I am still sitting with a screen that's damage.<br> <br> Smartcare number:***<br> <br> I do not have a problem with the technician who assisted. he was kind and assisted me where possible. """