Dead pixels: what is normal, what is not

A few isolated dead pixels are part of an LED screen's life — manufacturing standards tolerate a precise proportion. What matters is telling the benign isolated pixel from the defect announcing a module failure.

Quick answerAn isolated dead pixel is a failed LED or solder joint: as a benchmark, SJ/T 11141 allows up to 3 pixels per 10,000 indoors and 2 per 1,000 outdoors. Grouped dead pixels, pixels in a line, or counts growing week after week are not normal: that is a module defect to address.

Dead, stuck or shorted: three different defects

A dead pixel stays black whatever the content: destroyed LED or broken solder joint.

A stuck pixel stays lit, often in one colour: shorted LED. If it contaminates the whole column (the « caterpillar »), the short disturbs the scan and the module needs prompt attention.

A pixel missing one colour, or showing a « cross » when it should light, signals an open-circuit LED: the driver's open-circuit detection can confirm it. Never compensate by lowering VH voltage.

What the tolerances say

The industry benchmark SJ/T 11141 accepts up to 3 defective pixels per 10,000 indoors and 2 per 1,000 outdoors, outside the central zone. A new screen beyond those figures is a warranty case.

Distribution matters too: ten dead pixels scattered over 20 m² are barely visible; the same ten grouped in a corner at eye level are very visible — and negotiate differently with the supplier.

Repair: from micro-soldering to module replacement

Locate the affected pixels precisely (photo + cabinet/module position) and track their evolution for a few weeks.
For a few isolated out-of-tolerance pixels, a workshop can replace LEDs one by one (micro-soldering) on pitches that allow it.
Beyond that, replace the whole module: faster, guaranteed result. Order the same reference, same batch if possible.
After replacement, reload the calibration coefficients to avoid a square of different tint.

When to call an engineer

Fast-multiplying pixels, grouped defects after heat or humidity, or a screen under warranty: build a file (photos, counts, positions) before any intervention.

A failure right now? Lédia, our AI engineer, guides you step by step, 24/7, photos included.

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Frequently asked questions

Can a dead pixel « contaminate » others?

Not directly. But pixels dying in series in the same area signal a module ageing badly (heat, humidity, fragile LED batch) that will eventually be replaced.

The pixel came back after a few days — possible?

Yes: a tired solder joint can reconnect with temperature swings. It is a reprieve, not a cure — note its position, it will return.

Can I repair an LED myself?

On coarse pitch (≥ 6 mm) with micro-soldering equipment and the right LED model, it is feasible in a workshop. On fine pitch, no: module replacement is the only realistic option.

Are dead pixels covered by warranty?

Beyond the contractual tolerances (often based on SJ/T 11141), yes with most serious manufacturers. Hence the value of a precise, dated count.