Signal and mapping
- Every input tested at its native resolution, one at a time.
- Source-to-panel mapping verified by showing a numbered grid.
- Overscan and underscan checked on each input.
- All presets saved and recalled successfully.
- Backup of the processor configuration exported to USB.
Picture quality
- Full white uniformity checked at 3 m and at the closest seat.
- Grey ramp from 0 to 100 percent, looking for banding.
- Colour bars on every panel, checking for a swapped cable.
- Brightness measured at centre and corners with a meter.
- Seam gaps measured at three heights on every vertical joint.
Audio and control
- Audio embedded and de-embedded correctly, no lip sync error.
- Control system can power on, power off, and select sources.
- Emergency input or blank screen function tested.
Failure modes
- Pull one source cable, confirm the wall shows the expected message rather than a frozen frame.
- Power cycle the processor, confirm it returns to the last state.
- Simulate a single receiving card failure, confirm the rest of the wall keeps running.
- Check that the bypass or fallback content plays.
Documentation
- As-built drawing with cable IDs.
- Processor configuration file and IP schedule.
- Spare parts list with locations.
- Two-hour operator training, signed attendance.
Why the failure-mode checks matter most
The picture working on handover day is the minimum. What the client remembers is what happened the first time something failed. A wall that shows a clear message and keeps the rest running is a wall they trust. A wall that freezes and needs a site visit is a wall they regret.