MacBook T-CON Board Failure: Timing Controller Symptoms, Lines & Black Screen Fix

Diagnose Timing Controller (T-CON) failures on Apple Silicon and Intel MacBooks. Vertical colored bars, ghosting, cold start blackouts, and board repairs.

Tools24Now Hardware Team

Display Microelectronics & TCON Engineering

Role of the Timing Controller (T-CON)

The Timing Controller (T-CON) board sits hidden behind the plastic chin cover at the bottom of your MacBook screen. Its purpose is to translate high-speed eDP serial video data from the Apple Silicon GPU into parallel pixel voltage signals for column and row driver ICs (Chip-on-Film).

Symptoms of a Failing T-CON

Screen turns on with vertical colored lines (pink, green, purple bars).
Display is black when cold, but starts displaying fuzzy gray imagery before eventually stabilizing when warm.
Image ghosting or slow pixel response time.

Keep the T-CON operational using the DisplayGuard background daemon.

Topics:TCON BoardTiming ControllerVertical LinesBlack ScreenDisplayGuard

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