Having issues with your iPhone not charging or the battery quickly draining? Often this can be the result of damage to a chip known as "Tristar" on your iPhone's logic board. The chip is a part of the circuitry controlling USB functions. Most often this is caused by using a cheap or unofficial cable to charge your iPhone.
Many iPhone 7 and 7 Plus owners are experiencing a frustrating issue where the phone has no audio, and the speaker button is greyed out during calls. Other symptoms that could be encountered . . .