To determine if an LED rental screen needs repair or replacement, consider the following:
I. Display Performance Abnormalities:
1. Excessive Brightness Decline: When the overall or partial brightness of the LED rental screen is significantly lower than the initial value (e.g., decline exceeding 30%), it will lead to a deterioration in viewing quality at a distance. This is usually caused by aging LED chips, insufficient power supply to the driver circuit, or heat dissipation failure. Data should be measured using a luminance meter. If the average brightness is lower than 70% of the nominal value, the driver module or LED chip board should be repaired or replaced first.
2. Color Deviation or Color Block Abnormalities: If the LED rental screen exhibits uneven color blocks or overall color temperature deviation (e.g., too cool/too warm), it directly affects color reproduction. Such problems are often caused by inconsistent color decay of LED chips, loss of color calibration data, or signal interference. A professional colorimeter should be used to test the color coordinate deviation (Δuv>0.01) or brightness uniformity (<80%), and then the problem should be resolved through color calibration or module replacement. 3. Dead LEDs/Positive Pixel Spread: If one or more LEDs fail to light up and their number increases rapidly over time (e.g., more than 5% increase per week), it indicates a defect in the LED packaging or an overload in the driver circuit. If the negative pixel rate of the LED rental screen exceeds industry standards (e.g., negative pixel rate >0.01% for screens below P2.5), the entire LED board needs to be replaced to prevent the display defect from spreading.
II. Mechanical Structure Failures:
1. Lifting System Stuttering/Abnormal Noise: Stuttering, shaking, or metallic friction sounds during the lifting process of the LED rental screen are usually caused by guide rail deformation, gear wear, or abnormal motor load. If the lifting time deviation exceeds 10% (e.g., nominally 5 seconds but actually requires 7 seconds), or the frequency of abnormal noise increases with usage, the transmission components need to be replaced promptly to prevent equipment failure.
2. Loose Cabinet Connections: Gaps, misalignment, or shaking at the splicing points of the LED rental screen are mostly caused by worn quick-lock clips, deformed positioning pins, or insufficient installation torque. If the gap width is greater than 1mm or the misalignment is greater than 0.5mm, it may cause waterproofing failure or structural stress concentration. Tightening connections or replacing damaged parts is necessary to ensure safety.
3. Reduced Protection Rating: In outdoor environments, if the LED rental screen shows water seepage, internal condensation, or clogged dust filters, it indicates that the sealant has aged or the casing has deformed. If the IP protection rating drops from IP65 to below IP43, it can cause electronic components to short-circuit due to moisture. Resealing or replacing the casing is necessary to restore protective performance.
III. Electrical Safety Risks:
1. Reduced Insulation Resistance: Insulation resistance between the power cord and the metal casing <1MΩ (normally it should be >50MΩ) may cause leakage or short-circuit risks. Such problems are often caused by aging wiring, loose connections, or component breakdown. The LED rental screen must be immediately shut down and the insulation fault points checked.
2. Grounding Fault: Grounding wire resistance >0.1Ω or a broken ground wire will weaken the current conduction capacity during lightning strikes or leakage, endangering personnel safety. Therefore, when a grounding fault occurs in the LED rental screen, the grounding resistance must be tested with a megohmmeter. If it exceeds the standard, the grounding wire needs to be re-soldered or the terminal replaced.
Power Module Overheating: A power supply surface temperature >65℃ (normally <50℃) or frequent restarts are usually caused by bulging capacitors, dried-out electrolyte, or aging power components. In this case, the LED rental screen's power module needs to be replaced to avoid cascading failures (such as burnt-out driver ICs).
