What Is a Touch IC?
The board-level chip that processes all touch signals from the digitiser.
Definition: The Touch IC is an integrated circuit on the phone’s logic board that receives raw electrical signals from the digitiser (touch layer) and converts them into touch coordinates the processor can act on. It is separate from the digitiser itself — and a Touch IC fault cannot be fixed by replacing the screen.
How to tell Touch IC from digitiser
If a new, confirmed-working screen is installed and ghost touch or no-touch persists, the Touch IC is the fault. If touch is dead or erratic only on the original cracked screen but works on a replacement, the digitiser was the cause. PhoneDoctor tests with a known-good screen before concluding a Touch IC fault — saving the cost of an unnecessary repair.
Touch IC fault symptoms
Ghost touch after screen replacement: New screen installed but phone still registers inputs not made — Touch IC is likely the cause.
No touch on any screen: If the phone shows a perfect image but touch is completely dead even after screen replacement, the Touch IC has failed.
After water damage: Corrosion on Touch IC contacts is a common cause of touch failure on water-damaged phones — even after the board has been cleaned.
Related terms
→ Digitiser — the touch layer that sends signals to the Touch IC
→ Ghost Touch — a key symptom of Touch IC failure
→ Microsoldering — required to replace a Touch IC
→ IC — Touch IC is one type of integrated circuit
Ghost touch or no touch after a screen replacement?
PhoneDoctor diagnoses Touch IC faults and performs microsoldering replacement. Free diagnostics, no fix no fee.