What Is an IC?
Integrated Circuit — the miniaturised chips that control every function in your phone.
Definition: An IC (Integrated Circuit) is a miniaturised electronic circuit manufactured on a semiconductor chip. Modern phones contain dozens of ICs — each responsible for a specific function. IC failure is the root cause of most board-level phone faults that survive a screen or battery replacement.
Key ICs in every phone
Application Processor (AP): The main CPU/GPU — runs iOS or Android. The most complex IC on the board.
Power Management IC (PMIC): Controls all power distribution — charging, voltage regulation, battery management.
Touch IC: Processes signals from the digitiser into touch coordinates.
Audio IC: Handles all speaker and microphone signals.
Baseband IC: Manages cellular (4G/5G) connectivity.
NAND Flash IC: The storage chip — holds the OS, apps, and all user data.
What IC failure looks like
IC failure presents as sudden loss of a specific function — cellular signal disappears after a drop (baseband IC), phone charges slowly or not at all (Power IC), no sound from speaker or mic (Audio IC), no touch after water damage (Touch IC). The pattern of failure points directly to the IC responsible. Replacement requires microsoldering.
Related terms
→ Logic Board — the board all ICs are mounted on
→ Microsoldering — the technique used to replace faulty ICs
→ Touch IC — one specific IC that commonly fails
→ Power IC — another IC that commonly fails after drops or water
Specific function stopped working after a drop or water damage?
IC failure is the most common board-level fault. PhoneDoctor diagnoses for free and performs microsoldering replacement.