My iPhone 6s is dead with a black screen will not power on it will not show charging icon or battery icon it's just totally dead so to speak. I have had the battery replaced and he checked a few of the components inside, I've tried soft reset I tried a hard reset I tried putting it in dfu mode I tried different Chargers different box plug-ins different wall receptacles and using a laptop. Nothing works nothing changes it from Just being powerless no noise no vibration just dead. I'm wondering if there's any hope for repair or should I just throw it away