The high maintenance costs of LED display modules are often due to a lack of systematic preventive maintenance. By strategically planning maintenance cycles and tasks, maintenance costs can be reduced by over 40%. The following is a phased preventive maintenance schedule, developed based on equipment operating characteristics and environmental factors.

Daily Inspection and Maintenance Checklist (5-10 minutes)

 Temperature Monitoring: Use the control system to monitor the temperature of each module. The normal range should be 25-45°C. If it exceeds 50°C, check the cooling fans (each module is equipped with two ball bearing fans, with a speed of 1800-2200 rpm). During daily inspection, a shopping mall screen discovered dust accumulation on the cooling fans. Prompt cleaning prevented LED light failure caused by overheating.

 Power Status: Check the power module indicator. A solid green light indicates normal operation. When flashing, record the voltage (DC5V±0.2V) and current (≤3A per module). In one case, early detection of power ripple anomalies prevented damage to a batch of modules.  Screen Inspection: Play a solid-color test pattern (red/green/blue/white) to quickly identify obvious faults such as dead pixels (allowed to be ≤3 per square meter) and bright lines. A traffic screen successfully underwent daily inspection and promptly replaced 12 faulty modules to prevent further failures.

Weekly Maintenance (30 minutes)

 Dust Control: Use compressed air (pressure ≤ 0.5 MPa) to clean dust from the module surfaces. Outdoor screens require special attention to the gaps in the waterproofing strips (2-3 mm wide). For a scenic spot screen, bird droppings were removed during weekly maintenance to prevent water ingress caused by colloid corrosion.

 Connector Tightening: Check the inter-module cables (gold-plated contacts ≥ 3 μm thick) and the power cord connections. Tighten using a torque wrench to a standard of 0.8 N·m. A loose connector was discovered on a performance screen during weekly inspection, preventing a black screen during a performance.  Light decay test: Use an illuminance meter (accuracy ±3%) to measure white field brightness. A module is flagged when it drops by more than 15% from the initial value. This data was used by one commercial screen to preemptively replace the light decay module to maintain image consistency.

Monthly maintenance (2 hours)

 Cooling system maintenance: Disassemble the fan and clean dust from the blades (dust thickness allowed is <1mm). Apply silicone grease (model KLUBER ISOFLEX NBU 15) to the bearings. This extended the fan life of one airport screen to 40,000 hours after the monthly maintenance.

 Power supply burn-in test: Simulate full-load operation for 2 hours, monitoring the power supply module temperature (≤65°C) and output stability. At one station screen, two aging power supplies were replaced in advance, avoiding failures during peak hours.  Color Calibration: RGB wavelengths (R: 625-635nm, G: 520-530nm, B: 460-470nm) were calibrated using a spectrocolorimeter (accuracy ΔE < 0.5). A studio screen maintained a professional standard of ΔE < 1.0 during monthly maintenance.

Quarterly System Inspection (4 hours)

 Structural Safety Inspection: A torque wrench was used to re-inspect the hoisting structure (safety factor ≥ 5). Bolt preload must reach 90% of the design value. During quarterly maintenance, cracks were discovered in the truss welds of a convention center screen, and timely reinforcement was required to avoid safety hazards.

 Waterproofing and Sealing Test: A spray test (80-100L/㎡・min) was performed on outdoor screens. After 30 minutes, the internal humidity was checked (< 60% RH). This test detected premature deterioration of the rubber strips on a screen in a coastal city. Data backup and system upgrades: Back up control software configuration parameters and upgrade firmware to the latest version (recommended quarterly). A timely upgrade resolved refresh rate compatibility issues for a sports stadium's screens.

By implementing this maintenance schedule, the annual repair cost for 20 LED screens at a chain store dropped from 180,000 yuan to 72,000 yuan, reducing module replacements by 65%. It's recommended to adjust maintenance frequency based on the age of the equipment: new screens under one year old can follow the standard maintenance schedule, while screens over three years old should increase the frequency of daily and weekly inspections by 50%, focusing on the aging of the power supply and LEDs.