| Quality Management | Whether the supplier operates a documented quality management system covering incoming materials, production, inspection, nonconformity control, and corrective actions. | Valid ISO 9001 certificate, certification scope, issuing body, audit status, quality manual, and recent corrective-action records. | ISO 9001 should cover the relevant manufacturing site and display-related activities. Verify the certificate directly with the issuing certification body where possible. | Critical |
| Product Safety | Electrical, mechanical, thermal, and fire-safety controls for display assemblies, control boards, power supplies, and enclosures. | Applicable test reports, risk assessments, component safety documentation, production safety tests, and traceable inspection records. | Products intended for information technology or audio/video equipment should be assessed against the applicable edition of IEC 62368-1 or the destination market’s recognized equivalent. | Critical |
| Market Certifications | Conformity requirements for the countries or regions where the display will be sold or installed. | Applicable declarations of conformity, test reports, technical files, product labels, and certification records matching the exact model. | For the European Economic Area, check applicable CE requirements. For the United States, verify FCC requirements for unintentional radiators where applicable. Requirements vary by product configuration and market. | Critical |
| Environmental Compliance | Control of restricted substances, chemical disclosure, recycling obligations, and material compliance. | RoHS test reports, supplier declarations, material declarations, REACH-related information, and controlled-material lists. | Evidence should correspond to the current product bill of materials and be updated after major component or material changes. RoHS and REACH obligations depend on the destination market and product category. | High |
| Environmental Management | Management of energy use, waste, emissions, chemicals, and environmental risks at the manufacturing site. | ISO 14001 certificate, environmental permits where required, waste records, chemical-management procedures, and environmental objectives. | ISO 14001 certification is a strong indicator of a formal environmental management system, but it does not by itself prove that every product meets market-specific environmental regulations. | High |
| Worker Health and Safety | Occupational safety controls for soldering, electrical testing, chemical handling, machinery, fire prevention, and emergency response. | ISO 45001 certificate, safety training records, incident statistics, emergency procedures, and workplace inspection reports. | A documented occupational health and safety system should be implemented at the actual production site, with evidence of periodic internal reviews and corrective actions. | Medium |
| Factory Capability | Production capacity, process suitability, equipment condition, automation level, and ability to control critical display processes. | Factory audit, equipment list, process flow chart, capacity plan, maintenance records, and production-line photographs or on-site verification. | The supplier should demonstrate sufficient capacity for the required monthly volume without excessive reliance on undisclosed subcontractors or uncontrolled manual rework. | Critical |
| Incoming Material Control | Inspection of panels, LED or LCD modules, driver boards, power supplies, cables, frames, and other purchased components. | Incoming inspection standards, approved supplier list, sampling plans, component specifications, inspection records, and quarantine procedures. | Critical components should have defined acceptance criteria, lot traceability, and documented disposition of rejected materials before entering production. | High |
| Process Control | Control of assembly, soldering, bonding, calibration, firmware loading, sealing, and final configuration. | Work instructions, process control plans, operator training records, calibration certificates, and first-article approval records. | Critical parameters should have defined limits, responsible operators, inspection frequency, and documented reactions when results fall outside specifications. | Critical |
| Display Performance | Brightness, contrast, color consistency, viewing angle, pixel defects, refresh behavior, touch performance, and image stability. | Approved product specification, calibrated measurement equipment, inspection software, test records, and sample approval report. | Use measurable acceptance limits agreed before production. Test conditions should identify ambient temperature, measurement distance, operating mode, and calibration status. | Critical |
| Reliability Testing | Resistance to temperature, humidity, vibration, shock, continuous operation, power cycling, and transportation conditions. | Reliability test plan, sample identification, test duration, environmental conditions, failure analysis, and corrective-action reports. | Testing should reflect the intended installation environment. Common methods may reference IEC 60068 test procedures, with exact tests selected according to product design and application. | High |
| Final Inspection | Verification of appearance, dimensions, labeling, electrical safety, software version, accessories, packaging, and functional performance before shipment. | Final inspection checklist, acceptance sampling plan, test records, nonconformance reports, and release authorization. | Every shipment should be released against an approved inspection standard. Critical safety or functional defects should not be accepted under a normal sampling allowance. | Critical |
| Traceability | Ability to trace finished products to production date, batch, key components, operators, test results, and shipping records. | Serial-number system, barcode records, batch history, component lot records, and retention policy for quality documents. | Each unit or production lot should be traceable through manufacturing and final inspection. Records should be retained for a period suitable for the product risk and contractual requirements. | High |
| Calibration System | Accuracy and control of photometers, colorimeters, electrical testers, temperature sensors, gauges, and other inspection equipment. | Calibration certificates, equipment registers, calibration intervals, out-of-tolerance procedures, and reference-standard records. | Measurement equipment should be calibrated against recognized standards at defined intervals, with equipment status clearly identified on the production floor. | High |
| Subcontracting Control | Transparency and oversight of outsourced processes such as metal fabrication, PCB assembly, coating, injection molding, or logistics packaging. | Approved subcontractor list, quality agreements, audit reports, incoming verification records, and change-notification procedures. | Subcontracted processes should be disclosed, risk-assessed, and controlled under the supplier’s quality system rather than managed only through informal communication. | High |
| Change Management | Control of changes to components, suppliers, firmware, tooling, materials, production location, and manufacturing processes. | Engineering change procedure, change approval records, sample requalification results, and customer notification rules. | Changes affecting safety, compatibility, appearance, performance, or reliability should require documented review and, when necessary, customer approval before implementation. | Critical |
| After-Sales Support | Handling of technical questions, warranty claims, spare parts, field failures, software issues, and recurring defects. | Warranty policy, response-time commitments, return-material authorization process, failure-analysis reports, and corrective-action records. | Define response times, warranty scope, spare-parts availability, and escalation contacts in the supply agreement before mass production begins. | High |
| Audit Readiness | Willingness to permit document review, factory inspection, process observation, sample testing, and follow-up verification. | Completed supplier questionnaire, audit schedule, corrective-action plan, closure evidence, and access to relevant production areas. | A reliable supplier should provide consistent, verifiable records and close audit findings within agreed deadlines without unexplained gaps in documentation. | Critical |
