LED Display & Module Troubleshooting

This guide covers the most frequent failure points in LED systems. Follow the symptom → cause → solution flow for rapid resolution.


Symptom Possible Cause Diagnostic Step Action Required
Entire screen is black (no power) Power supply failure, tripped breaker, loose AC input Check PSU indicator lights; measure input voltage with multimeter Replace faulty PSU; ensure 220V ±10%; verify grounding
Partial blackout (large dark area) Failed receiving card, broken power cable to module row Inspect power distribution at affected zone; test with spare receiving card Replace receiving card or repair/replace power daisy-chain
Flickering or unstable brightness Unstable DC output, poor grounding, aging LEDs Measure PSU ripple with oscilloscope; check earth resistance (<4Ω) Install regulated PSU; re-ground system; replace aged modules
Color distortion / wrong colors Data signal error, IC malfunction, incorrect calibration Run “single-point test” in control software; inspect flat cable integrity Re-seat or replace ribbon cable; recalibrate color; replace faulty IC
“Caterpillar” lines (vertical color streaks) Driver IC leakage, shorted row transistor, ESD damage Locate streak origin; check for burnt smell or swollen capacitors Replace damaged module; use anti-static wrist strap during handling
Screen shows content but software can’t connect Network issue, IP conflict, sending card failure Ping control card IP; verify network cable; check firewall settings Replace Cat6 cable; assign static IP; swap sending card if needed


Maintenance Area Best Practice Frequency
Environment Keep ambient temperature 10–30°C (indoor); humidity <85% RH Continuous monitoring
Power System Use dedicated circuit with surge protection; ground resistance ≤4Ω Quarterly inspection
Cleaning Wipe with soft brush or microfiber cloth; no alcohol or solvents Monthly (outdoor), Quarterly (indoor)
Software Backup configuration monthly; update firmware annually As scheduled
Idle Displays Power on for 30 minutes every month to prevent moisture buildup Monthly
Still experiencing issues?
Our global engineering team provides remote diagnostics and on-site support for critical installations. Include your product model and error photos when contacting us.

Explore More from Queendom Lamp

Stay updated with the latest LED technology, lighting solutions, and industry insights.

Request a Quote About Queendom

Leave a Reply