Try this binding first
<input #checkbox (change)="onCheckBoxChanged(checkbox, setting)" [checked]="setting.values != 'false'" type="checkbox" />
Where the variable setting is a part of a parent *ngFor loop. This is different than other [(ngModel)] bindings; in that, we are going directly to the input checked attribute. What's interesting is that we had to add the comparator to get it to work.
[checked]="setting.values != 'false'"
Even though setting.values only had string values of "true" and "false" binding directly to it like these two statements:
Did not work! Not sure why, but I do know it can chew up time finding these syntactic errors.