A smartphone is built from about a dozen replaceable modules: the screen assembly, battery, charging port, cameras, back glass or housing, speakers, buttons and the logic board, all joined by flex cables inside a frame. Most repairs replace one module. Replacement modules for iPhone, Samsung, Motorola and Pixel phones are catalogued by model at Parts4Cells.
What are the main parts of a smartphone?
| Part | What it does | Common failure |
|---|---|---|
| Screen assembly | Displays the image and senses touch | Cracked glass, lines, dead touch |
| Battery | Stores power | Capacity loss, swelling |
| Charging port | Takes power and data | Loose connection, debris, wear |
| Cameras | Front and rear imaging | Cracked lens, blur, black image |
| Back glass / housing | Rear panel and structure | Cracks, bent frame |
| Speakers and microphones | Audio in and out | Muffled or silent audio |
| Logic board | Processing, memory, radios | No power, no signal, board faults |
How do repairs usually work?
Most phone repairs follow the same pattern: open the phone (heat softens the adhesive), disconnect the battery, swap the failed module, test before sealing, and reseal with new adhesive. Standard tools cover most jobs. A phone repair tool kit plus adhesive is the usual starting point.
Sources
Sources checked September 29, 2026. Prices, stock and program terms change; confirm them on the linked pages.