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Tesla matrix LED headlights: flicker, dead pixels, burnt segments — repair vs replace (2026)

Matrix LED problems on Tesla Refresh S/X (2021/2022+), Model 3 Highland (late 2023+) and Model Y Juniper (2025+): high-beam flicker on the highway, dark holes in the beam pattern, full-segment failure, 'Headlight system fault' on the cluster. Which symptoms are software bugs that firmware fixes, which are driver-chip burnouts requiring a full headlight swap, and why US cars had matrix hardware but no adaptive function until 2024.