The cycle
Forty-five degrees. Full white, red, green, blue, grey steps, moving bars. Seventy-two hours uninterrupted.The point is to run backlight, driver boards and every pixel at once, at a temperature the panel will meet in a real room on a bad afternoon.
Day one removes the obvious
Stuck pixels that were invisible at room temperature. A driver board that runs hot and drops a column under load. Backlight unevenness at the edges that only shows on a full white field.Two to four units per hundred. Not dramatic failures: the kind that becomes a warranty claim in month two if it ships.
Day two and three remove the ones that only appear warm
Thermal cycling defects: a component that works cold and drifts once the cabinet reaches operating temperature.Since the panel spends years in a room that is warm in the afternoon, we prefer to find that here rather than in the client's building. This is the entire argument for 72 hours over 24, and it is why we do not offer a shorter test on request.
What ships with the batch
Serial number, brightness reading, colour reading, and any pixel defect inside the acceptance standard.When a client asks why a wall costs what it does, this is the part of the answer that is not a brochure.
What it cannot catch
A power board that fails at year three. A bracket that sags. A panel that was marginal when it arrived from the panel maker.For large orders we run one complete wall sample for twenty-four hours before the rest of the batch is packed, which catches frame and alignment problems the panel test cannot.
The cost, stated plainly
Three days of electricity and floor space that could be shipping. A small percentage on the unit price.The alternative is a replacement panel, air freight, a technician, and a client who tells the story at every industry dinner for a year.