- Module: The pixel board: LEDs, drivers and its connector
- Cabinet: The enclosure: modules plus structure, power, receiving card
- Quote language: Prices per module, per cabinet and per square metre are not comparable
- Spares logic: Modules cover pixel faults; a spare cabinet covers bigger failures
- Service split: Front-service modules and rear-service cabinets solve different rooms
The module: where the picture lives
A module is a printed circuit board carrying a grid of LED packages, the driver chips that switch them, and the connectors that carry data and power in. Modules come in defined sizes and in a pitch, which is the distance between pixel centres. Snap a grid of modules together and you have a continuous image surface; the seams between modules are the finest visible joints on the wall.
Because modules hold the pixels, most visible faults live here: a dead pixel cluster, a dark line, a colour patch that drifts from its neighbours. Module-level diagnosis is therefore the bread and butter of display maintenance. A wall's long-term look depends heavily on whether replacement modules years from now will match the ones that stayed on the wall, which is a batch and calibration question worth asking at purchase.
The cabinet: where the system lives
A cabinet wraps a grid of modules in a rigid frame and adds everything that makes the frame a system: power supplies that feed the modules, receiving cards that translate incoming data, the internal cabling, and seals and gaskets where the venue demands weather protection. Cabinets are the units that bolt to structure, that stack into large walls and that cranes lift into place on a festival site.
Cabinet design decides much of what buyers experience daily. Depth sets how far the wall stands off the wall behind it. Flatness tolerances decide whether the tiled face reads as one surface or a patchwork. Weight drives the structure and the install labour. Front or rear access, which is a cabinet trait, decides whether the display can sit against finished architecture or needs a corridor behind it.
Why the vocabulary matters in quotes
Suppliers quote per square metre, per cabinet or per module, and the three numbers cannot be compared until you know how many modules sit in a cabinet and how many cabinets cover a square metre. A quote that looks cheap per module and never states the cabinet count is not a quote; it is a riddle. The fix is procedural: ask every bidder to price the wall as a bill of materials with module counts, cabinet counts, structure and processing as separate lines.
The same discipline applies to spare parts. A spare module covers the most common failure class, the pixel faults, at the lowest cost. A spare cabinet covers the rarer, heavier failures such as a damaged power supply bay or a crushed corner after a handling accident. Rental fleets live on spare cabinets because their cabinets travel; fixed installations lean on spare modules because their cabinets rarely move once set.
Service: which part do you reach for
Front-service designs let a technician pull a module, or in some systems a whole module grid, from the face of the wall. That is what makes a display against a finished surface maintainable. Rear-service designs open the back of the cabinet, which is faster and cleaner where a corridor exists behind the wall. Both routes end at the same module; the access choice is about the room, not the electronics.
Cabinet-level service exists for the failures modules cannot explain: a failed power supply, a receiving card that stopped answering, a damaged frame. Ask how the supplier's diagnostics distinguish a module fault from a cabinet fault over the phone, because that distinction decides whether the first service visit arrives with a module in a case or a whole cabinet on a truck.
Pitch, batch and the ageing wall
Modules age. Brightness and colour drift slowly over years of duty, and a module bought later from a different batch can sit visibly apart from its aged neighbours. Good suppliers handle this with calibration records that describe the wall's current state, so a replacement can be adjusted to the wall as it is now, not as it left the factory.
Ask, at purchase, how replacements will be matched years from now: whether the supplier keeps batch records, whether calibration data travels with the documentation, and whether a replacement service exists at all. The answers cost nothing now and decide whether year-six maintenance is a calm module swap or a negotiation with a discontinued part.
A short anatomy checklist for buyers
Walk every quotation through the same anatomy: module size and pitch, modules per cabinet, cabinet dimensions and weight, modules and receiving cards per cabinet, power supply arrangement, front or rear service, and the spare-parts list in modules and cabinets separately. Two bids written in this form can actually be compared, and the differences will tell you where each supplier concentrated their cost.
The anatomy also arms your service conversations. When a technician reports a fault, knowing whether the symptom is module-scale or cabinet-scale, and knowing what spares are on the shelf, turns a support call into a plan. Vocabulary, it turns out, is not pedantry. It is the cheapest form of quality control a display buyer owns.
| Aspect | Module | Cabinet |
|---|---|---|
| Contains | LEDs, drivers, connectors | Modules, power, receiving cards, frame |
| Typical fault | Dead pixels, colour drift | Power failure, frame damage |
| Spare weight | Light, shelved in quantity | Heavy, one or two per site or fleet |
| Access route | Front or rear per design | Bolts to structure; access per design |
Two quotes that looked alike
Two bids for the same opening showed close per-square-metre prices. One omitted the cabinet count and the structure; the other listed every module and frame part. Only the second could be compared honestly, and it revealed the first had buried the frame cost in the square-metre rate.
A module swap that became a cabinet job
A screen lost a power supply inside the cabinet. The site had spare modules but no cabinet plan, so the first service visit could not fix the fault and a second visit with a cabinet followed. A written cabinet-level plan would have sent the right part first.
Steps for a project: module vs led cabinet
- Read every quote as a bill of materials Ask each bidder to list module counts, cabinet counts, structure and processing as separate lines. A per-square-metre number with no breakdown hides the cabinet count and cannot be compared with another bid.
- Plan spares at both levels Size spare modules for the common pixel faults and keep a written plan for cabinet-level failure such as a damaged power bay. Fixed installations lean on modules; travelling rental fleets keep spare cabinets because their cabinets move.
- Brief service by fault scale Tell the supplier whether symptoms are module-scale or cabinet-scale and what sits on the shelf. That distinction decides whether the first visit arrives with a module in a case or a whole cabinet on a truck.
- Ask about aged-wall matching At purchase, ask how a replacement module years later will be matched to the wall as it looks now. Keepers of batch records and calibration data avoid a visible mismatch on a wall that has run for years.
Misconceptions about module vs led cabinet
“A module and a cabinet are the same thing.” — The module carries the pixels; the cabinet is the enclosure that holds a grid of modules with power, a receiving card and the mechanical frame. Quotes that blur the two cannot be compared and cost more to service.
“The cheapest per-module price is the cheapest wall.” — A low per-module rate can hide a higher cabinet count or an unbuilt structure. The fair comparison is the full bill of materials, where the module price is only one line among several.
Verification points for module vs led cabinet
- Require a bill of materials with module and cabinet counts, not just a per-square-metre price
- Confirm modules per cabinet and cabinet dimensions before comparing bids
- Size the spares plan in spare modules plus at least a plan for cabinet-level failure
- Match service access to the room: front-service against finished surfaces, rear where a corridor exists
- Ask how replacement modules will be matched to an aged wall years from now
A note for the supplier: module vs led cabinet
Modules carry pixels, cabinets carry systems, and quotes that blur the two are impossible to compare and expensive to service. Insist on a bill of materials that names both, plan spares at module level with a cabinet plan behind it, and match the access design to the room. The buyer who speaks the anatomy fluently gets better walls and calmer maintenance calls.