A user's tablet screen is unresponsive to touch.

A tablet’s display is made of two key parts that work together: the LCD (or OLED) that shows the image, and the digitizer that detects touch input. If the screen image looks normal but the device does not respond to taps, swipes, or gestures, the most likely failed component is the digitizer (or the digitizer layer/cable). The digitizer is a transparent sensor grid that converts touch into signals the system can interpret. When it fails, the tablet may still power on and show a clear picture, but touch will not register at all or will behave erratically.

Because the device shows no physical damage and a system reset does not fix the issue, this points away from a software glitch and toward a hardware input failure. Replacing the LCD screen is typically indicated when you see display problems such as no image, distorted colors, flickering, dead pixels, or backlight issues—not purely touch failure. A battery problem would affect power/charging, not touch responsiveness. A motherboard replacement is far more invasive and not the most likely first hardware fix for a touch-only failure. Therefore, the correct component to replace is the digitizer.