Customer question: The screen works at startup but restarts, dims or loses sections after an hour. What is likely?
English explanation
Time-dependent failure often points to power, heat, signal stability or a component that changes behaviour as it warms. Record the start time, ambient temperature, brightness, white-content ratio, affected cabinet, circuit and exact recovery method. Compare cold start with stable operation. Do not assume that a software restart proves a software problem. Check the power tree with qualified personnel: supply stability, circuit protection, connector temperature, power-supply condition and zone allocation. Review cooling: rear clearance, blocked vents, fans, filters, glass cavities, decorative panels and direct sun. High brightness and white content create a higher thermal load, but the actual limit is model-specific. If only one branch is affected, inspect signal connectors, cascade order and receiver status. If the screen dims after high brightness but recovers after cooling, thermal protection is possible and requires site measurement. Do not hide a structural cooling problem by permanently reducing brightness without documenting the limitation. Run a controlled long-test with recorded content and conditions. Preserve configuration and change only one factor at a time.
Service boundary
Electrical measurements, thermal modifications and cabinet opening require qualified personnel. The final cause may require factory or site testing. —
