Checked="checked" not working in angularjs while checking a checkbox using conditions

I need to check a checkbox based on conditions. In my case, the function returns true for ng-checked.But after submit,the value shown as not checked. Any solutions for this?, greatly appreciated. Here I have tried so far:

$scope.findViewTocheck = function (module) {
        if (module.x|| module.y|| module.z|| module.a) {
            return true; // module.x ,module.y ,module.z,module.a these are booleans
        }
        else {
            return false;
        }
    }

<input type="checkbox" ng-checked="findViewTocheck(module)"> //Here I am checking the value to be checked or not.