A reception wall in a leased lobby is usually a structural wall, a shaft, or a party wall. There is no room behind it. When the design lands on a 4 × 2.5 m LED face in that position, the installation method has already been decided by the building — you are only choosing whether to admit it before or after the quote.
That method is front service. Everything else about the project follows from it.
What rear service actually needs
Rear-service cabinets need a cavity to stand in. Practically that means 600 to 800 mm of clear depth behind the face, a walkable floor, and ventilation, because a person has to open the cabinet, reach the receiving card, and pull a module out without hitting the wall behind them.
In a lobby, 700 mm behind the reception wall is not free. It is floor area the tenant is paying rent on, or it is a shaft that cannot be moved, or it is somebody else's meeting room. On a glass facade it does not exist at all.
Rear service is not the cheaper option in these rooms. It is the option that requires a building alteration before the screen arrives, and building alterations are the slowest thing in the project.
What front service changes
A front-service cabinet puts every serviceable part behind the module face. The module lifts out from the front with a suction tool, and the receiving card, power supply and cabling are reachable through that opening.
Four consequences matter more than the price difference:
Module-level access means module-level spares. You no longer need a maintenance corridor, but you do need spare modules on site, matching the production batch. Colour and brightness drift between batches is real, so order spares with the wall, not after the first failure.
Connectors get exercised. Every module removal mates and unmates its connector. That is fine if the design expects it and the connector is rated for repeated cycles; it is not fine if the cabinet was designed as a sealed unit and someone improvised. Ask how many mate cycles the connector is rated for.
Height becomes the constraint, not depth. A 6 m high lobby wall still needs a tower or a platform to reach the top modules, even though they come out from the front. Front service removes the corridor, not the access equipment. Budget for how the facilities team will actually reach row 8.
Heat goes into the room. With no plenum behind, heat leaves through the face. In an indoor installation running at moderate brightness this is manageable, but confirm the thermal plan for a sealed enclosure — a glass-fronted lobby with the HVAC sized before the screen existed is the classic failure.
The flatness problem nobody prices
A flush wall is a promise about flatness. Concrete is not flat, plasterboard is worse, and a 4 m run of LED modules will show every deviation as a visible band at certain viewing angles.
Front-service cabinets handle this with adjustable mounting brackets and shimming behind each cabinet, which means the install crew needs time and a laser level, and the wall needs to be surveyed before the brackets are set out. If the schedule gives installation two days for a 10 m² wall on an uneven wall, the flatness will be whatever the wall was.
Cabling and power in a wall that has none
Two lines usually have to be pulled before the screen ships: a dedicated circuit sized for the wall at full white, and a data run to wherever the content player lives. In a leasehold lobby this means landlord approval, an isolator in a service cupboard, and often a fire-rated penetration.
None of that is LED work. All of it is on the critical path, and it is the reason these projects slip.
A checklist for the site survey
- Confirm there is genuinely no rear access — check the other side of the wall with the building drawings, not by tapping it.
- If rear access exists, price rear service honestly. It is usually cheaper per square metre and easier to maintain.
- If it does not, front service is the product, and the questions become: spare modules on the same batch, connector mate rating, and how the top row gets reached.
- Survey wall flatness along the full width and height. Adjustable brackets buy maybe 20 to 30 mm; they do not fix a bowed wall.
- Confirm power and data routes before the purchase order, not before commissioning.
- Agree who owns the spare modules and the suction tool after handover. Facilities teams lose both.
AISE2 indoor cabinets are built as a 960 × 960 mm front-service unit for exactly this constraint — flush wall, no cavity, service from the room side: https://www.mlxled.com/product/aise2-indoor-led-display-screen-960x960mm/
Front service flush wall or rear service with an 800 mm gap — which would you build? Tell me what is actually behind your wall and the answer is usually made for you.
I work with MuenLED, a Shenzhen LED display manufacturer.
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