Many LED projects do not fail because the display is defective. They fail because the site was never described precisely enough before the order was released. A customer may provide only the target width and height, while the installation team later discovers that the wall is not large enough, the maintenance door cannot open, the power point is too far away, or the structure cannot carry the load. A proper site survey is not simply a measurement of display area. It connects installation, power, signal, ventilation and maintenance into one set of conditions that different teams can verify.
Start with geometry. Record the usable wall width and height, the distance from the floor to the bottom of the display, the ceiling height, obstructions, doors, windows, fire equipment, columns and left/right boundaries. Do not measure only the finished decorative surface. Record the actual cabinet depth, frame, rear maintenance clearance and the working space needed to handle a cabinet. If 640 × 640 mm cabinets are proposed, work backwards from the number of cabinet columns and rows instead of rounding a target size and expecting the installer to “adjust it on site.” When there are a centre screen and two side screens, create a separate measurement block for each zone. Do not treat three independent screens as one continuous rectangle.
The second group is structure and maintenance. Confirm the wall type, steel locations, anchor points, lifting points, floor flatness, support method and allowable load. A fixed-installation display needs a clear rear access plan and a door-opening direction. A rental display needs a plan for locks, hanging bars, support feet, safety devices and flight-case handling. A front-service cabinet still needs enough space for the correct front-service tool and safe operator movement. Front access does not remove the need to plan the rear power, controller and structural interfaces.
The third group is the environment. Record indoor or outdoor use, direct sunlight, rain direction, sea air, dust, air-conditioning discharge, heat sources, ventilation and night-time brightness requirements. A transparent or grille display may have a different perceived contrast from a closed LED wall because the background remains visible. Take photos of the front, rear, both sides, the power point, the network point and the maintenance path. Mark the orientation and measurement date on the survey record.
The fourth group is power and signal. Confirm the supply voltage and frequency, distribution-board location, circuit capacity, protective earth, RCD/RCBO arrangement, cable route and equipotential-bonding responsibility. Confirm the video source: HDMI, DisplayPort, fiber, RJ45, browser window or an event-data computer. Record where the processor and sending equipment will be installed, whether the route crosses power cables or moving equipment, and whether each independent screen has its own output window or signal path.
The final survey package should contain a dimension sketch, cabinet layout, maintenance direction, structural photos, power photos, signal topology, environmental notes, customer approvals and open questions. Every critical number should have a source: field measurement, cabinet drawing, nameplate or manufacturer specification. This gives sales, engineering, installation and after-sales teams one version of the project instead of four different assumptions.
Before leaving the site, walk the complete route as an installer and as a future service engineer. Can a cabinet reach the installation point without passing through a doorway that is too narrow? Can a replacement module be moved from the loading area to the screen without dismantling unrelated equipment? Is there a safe place for the control computer, processor, spare parts and tools? Can a technician identify the first signal cabinet and the correct power circuit from the labels alone? These practical questions often reveal a risk that a dimension drawing cannot show.
The survey should also capture customer expectations that are easy to miss: the normal operating schedule, the most important content, the audience’s closest position, camera requirements, acceptable downtime, cleaning responsibility and emergency contact. If the customer expects the screen to be visible through glass or from a bright outdoor area, note the background and sunlight conditions. If the customer expects three screens to show different content, note that requirement before selecting the processor. If a structure, power point or network route has not been confirmed, mark it requires confirmation instead of silently assuming it is available. This status language keeps a preliminary survey from becoming an accidental promise.
Frequently Asked Questions
Q1: Can we quote a project when we only know the screen width and height?
Yes, for a preliminary budget. A final installation proposal also needs cabinet dimensions, cabinet depth, maintenance method, structure, power, signal distance and environment.
Q2: Can site photos replace measurement?
No. Photos show obstructions and access conditions, but critical width, height, depth, anchor and maintenance dimensions must be measured.
Q3: Can three independent screens be surveyed as one screen?
No. Each screen needs its own mechanical, power, signal, resolution and maintenance boundary, even if one processor controls all three.
Q4: Which items should the customer approve in writing?
At minimum: screen position and dimensions, viewing direction, power conditions, maintenance method, brightness environment and signal source. Final product parameters still follow the approved specification.
