Glossary → Screen & Display Terms
What Is a Flex Cable?
The ribbon cable connecting your phone’s screen to its logic board.
Definition: A flex cable is a thin, flexible printed circuit ribbon used to connect internal components — including the screen, camera, charging port, buttons, and fingerprint sensor — to the phone’s logic board. Multiple flex cables run inside every phone, each carrying specific signals between components.
Why it matters for your repair
Flex cables are delicate — they can be torn, kinked, or have their connectors dislodged during a drop, or during a poorly-performed repair by an inexperienced technician. A damaged screen flex cable causes flickering, intermittent display, lines on screen, or total display failure — sometimes cheaper to fix than replacing the full panel. A torn camera flex causes camera failure. A damaged fingerprint flex means Touch ID or in-display fingerprint stops responding.
Flex cable symptoms by location
Screen flex: Flickering, coloured lines, half-screen blackout, or display that cuts out when phone is bent or pressed.
Charging port flex: Intermittent charging that depends on cable angle — a sign the port’s flex connection to the board is failing rather than the port itself.
Button flex: Volume or power buttons that feel normal but don’t register — the flex carrying their signals has detached or torn.
Related terms
→ Digitiser — connected to the logic board via flex cable
→ OLED — the display panel the flex cable connects
→ Logic Board — all flex cables terminate at the logic board
→ Charging Port — connected to the board via its own flex cable
Flickering screen or intermittent display?
PhoneDoctor diagnoses flex cable vs panel faults for free — a damaged flex is often cheaper to fix than a full screen replacement.