Customer question: Some cabinets are darker, or the whole used screen looks less bright than expected. How should I troubleshoot it?
English explanation
First separate a whole-screen brightness issue from a local mismatch. A whole-screen issue may involve ambient light, brightness mode, content, processor settings, receiving-card parameters, temperature or the delivered product specification. A local issue may involve calibration, module batch, power drop, receiver data or a damaged LED section. Test full white, gray, black-background text, faces and real customer content. Record ambient light, viewing distance, time, brightness setting and camera exposure. For transparent or outdoor screens, compare the real background and daytime environment. A software value of 100% is not a brightness measurement, and an automatic phone photo is not a calibrated result. Check the order model, serial number, component reference and factory record if the customer suspects the wrong brightness version. Preserve the configuration before adjusting brightness or calibration. If one cabinet changes after a controlled cable or receiver test, follow the fault boundary. If the issue appears only after long operation, check thermal conditions and power.
Service boundary
Rated brightness, measured brightness and perceived contrast are different. Serial/brightness confirmation may require factory evidence and a defined measurement method. —
