Display Factory Audit Checklist: What to Check When You Walk the Floor

1. The three questions a visit has to answer

Everything on the checklist serves one of three questions. Does the entity on the quotation own or control this production? Does the capacity they are quoting against exist here? Does the quality process run when nobody is watching?

Equipment answers none of them. A tidy SMT line tells you the building contains a tidy SMT line. Production records, serial number traceability and a materials store that matches the current order book tell you the rest. Keep those three questions in front of you and the visit stops being a tour.

2. Before you travel: the desk work

Most of what a visit can confirm is confirmable from your desk first, and doing it first is what lets you spend the visit on the things that genuinely require being there.

• Match the legal entity name on the quotation, the proforma invoice and the certificates. Three names for one deal is the finding, and you have not travelled yet.
• Confirm the production address, not just the registered address. They are frequently different, and the visit has to go to the production one.
• Pull the certificate files and check the holder and the model scope. A certificate held by a group company does not cover the entity invoicing you.
• Ask for the product family you are buying, in writing, and check it appears in their own catalogue. A seller whose line list is unbounded is usually a catalogue, not a factory.
• Request a live video call from the production floor before you book anything. A refusal at this stage saves you a flight.

3. First thirty minutes on site: identity and scope

Start at the door and work inwards. Photograph the company name on the building or the floor directory, and compare it with the entity on your documents. If the sign says a different name, ask immediately and in plain terms who owns whom, because the answer determines whether you have a factory visit or a subcontractor visit.

Then establish the footprint and the shift pattern: which floors or buildings, how many production lines, how many shifts, and how many people are on the line today. Headcount on shift is a better capacity signal than machine count, because machines can be idle and still impressive. Ask for the lease or the property certificate for the production site if the scale of the operation matters to your decision.

Finally, confirm which product families are built here. If you are buying an outdoor IP66 display, you want to see sealed enclosures being assembled and thermally tested, not a general assembly hall that could be building anything. The same applies to a mature indoor product: ask to be shown the specific station where a wall-mount signage unit is built, not a generic tour route.

4. Walking the line: what to look at and photograph

Walk in production order and photograph each station with its records. The sequence is what matters, because it lets you see whether work in progress is actually flowing or was staged for the visit.

• Incoming materials store. Does the stock match the order book, and are incoming materials labelled with inspection status?
• Board assembly. SMT line if they claim in-house board work, and if not, ask where the boards come from and who holds the test data.
• Panel and backlight assembly. Cleanliness, handling, and whether the environment matches the product being built.
• Sealing and thermal work for outdoor units. Gasket fitting, torque marks, and a thermal test step for sealed products.
• Ageing or burn-in area. Racks of finished units running. Count them, and ask how long a unit stays there.
• Test stations. What is measured, what is recorded, and whether the record carries a serial number.
• Packing and finished goods. Serial numbers on cartons, and whether finished stock matches what is being built today.

Ageing is the station most worth lingering at. A manufacturer running finished units under power for a period before packing is screening for early failure; one that packs straight off the line is shipping the screening to you. Ask how long and ask to see the log. On a multi-panel order such as an LCD video wall, also ask to see the panel matching and calibration step, because brightness and colour uniformity between panels is the failure mode a customer notices first.

5. Look for process, not equipment

Machines are purchasable. Records are not, at least not convincingly, and not for the volume of orders you would need to see. This is where the visit earns its cost.

• Work instructions at the station. Present, current, and in the language the operators read. A station without one is a station where the method lives in someone's head.
• First-piece approval. The record from the start of this run, signed, with the measurements attached.
• In-process inspection records. Dated, serial-linked, and from today or this week rather than a bound file from last quarter.
• Non-conforming area. Physically present and holding something. A factory with no rejects on the day you visit is a factory that has hidden them.
• Rework records. What failed, what was done, and whether reworked units go back through full test.
• Calibration labels. On the test equipment, in date. Expired calibration invalidates the measurements recorded with it.

Ask for a serial number at random and have them trace it: which line, which date, which batch of panels, which test record, which carton. A working traceability system produces that in minutes. A factory hoping you will not ask produces a phone call.

6. The questions that are hard to fake

Every supplier has answers prepared for the standard questions. These tend not to be prepared, and the quality of the answer tells you more than the walk did.

• What is on the line next week, and for which customer market? (They can redact the name and still tell you the market and volume.)
• How long is the lead time on the panel and the mainboard right now, and has it moved in the last quarter?
• Which parts of this product are made here and which are bought in, and from whom?
• Who owns the tooling and the mouldings for this enclosure?
• If I order 500 units of the current model, which station becomes the bottleneck and what is the realistic ship date?
• Can I have a live video from this line next Tuesday, unannounced, showing the serial number of the unit on the bench?

The last one is the cheapest verification tool that exists, and it is the reason to ask it during the visit rather than afterwards. A real manufacturer can do it. The answers to the bottleneck question are also useful downstream, because they tell you whether a 15 to 25 working day standard lead time or a 30 to 45 day OEM build is credible for your quantity.

7. When you cannot travel

A remote audit is weaker than being there, but a structured one is far stronger than a certificate PDF. The point is to remove the supplier's ability to prepare.

• Book the call with short notice and specify the route: materials store, assembly, ageing, test, packing, in that order.
• Direct the camera. Ask them to stop at a station and show the record on that bench, then the serial number of the unit in front of them.
• Ask for a newspaper, a phone screen showing the date, or a whiteboard with today's date in frame at the start.
• Request the same traceability exercise with a serial number you choose during the call.
• Have someone who knows the process watch it. A sales contact narrating a factory tour will narrate a good one regardless of what is there.

If the order justifies it, commission a third-party inspection firm to do it in person. They will not tell you whether the supplier is pleasant to work with, which is your job, but they will produce a documented report on capacity, process and working conditions that you can put in a file and act on.

8. What this article does not cover

This is the checklist for the day you walk the floor. It does not cover how to assess whether a supplier's OEM and ODM capability fits your programme over the long term, which is a broader question covered in the commercial display manufacturer guide. It does not cover how to tell a factory from a trading company before you get as far as a visit, which is the subject of the OEM factory against trading company article. And it does not cover what to do about quality during production, which is an inspection and payment milestone question rather than an audit question.

Audit checks against what a borrowed floor looks like

Check	What a real line looks like	What a staged visit looks like	How to record it
Entity on the door	Company name matches the quotation and the invoice	A different name, explained vaguely as a group company	Photograph the sign and the floor directory
Shift headcount	People on the line, consistent with the claimed output	Machines running, few operators	Count and note the shift pattern
Materials store	Stock matching the current order book, with inspection status labels	Thin stock, unlabelled, or a different product family	Photograph racking and labels
Work in progress	Units at every station, flowing	Completed units staged at stations	Walk in production order and photograph
Ageing area	Racks of finished units under power, with a log	Absent, or units not powered	Count racks and ask for the log
Records	Dated, serial-linked, from this week	Bound file from last quarter	Photograph today's record at a station you choose
Non-conforming area	Present and holding something	Nothing on the day of the visit	Ask what was rejected yesterday
Traceability	A serial number traced end to end in minutes	A phone call and a promise	Pick a serial number at random and follow it

Frequently Asked Questions