Dead pixels
Possible causes
LED package, solder joint, PCB pad, trace, or driver output
First diagnostic step
Test red, green, blue and identify whether the fault is one pixel, a row, or a column.
Open related guidance →Repair workflow
LED Display Fault Diagnostic Center
Start with the visible fault pattern before ordering parts. Each symptom can originate from the LED, PCB, signal chain, scan circuit, power system, configuration, or environment.
Color mismatch
Possible causes
Mixed LED bin, calibration, driver current, mask, or aging
First diagnostic step
Compare solid colors, grayscale, viewing angle, receiving-card calibration and replacement LED batch.
Open related guidance →No signal
Possible causes
Receiving card, HUB board, ribbon cable, network cable, configuration, or power
First diagnostic step
Verify power LEDs, data direction, known-good cables, card mapping, and controller output.
Open related guidance →Power issue
Possible causes
Power supply, wiring, voltage drop, connector, fuse, or distribution
First diagnostic step
Measure voltage under load and inspect terminals, polarity, current capacity, and distribution paths.
Open related guidance →Module short circuit
Possible causes
Shorted LED, capacitor, IC, solder bridge, damaged multilayer PCB, or moisture
First diagnostic step
Use current-limited power and resistance comparison. Locate heat safely before replacing components.
Open related guidance →Water damage
Possible causes
Ingress through masks, connectors, cabinet seals, PCB coating, or drainage
First diagnostic step
Disconnect power, document corrosion, clean and dry correctly, then test rails before energizing.
Open related guidance →GOB damage
Possible causes
Impact, delamination, trapped moisture, damaged encapsulation, or buried LED failure
First diagnostic step
Determine resin type and repairability before removing coating or applying heat.
Open related guidance →Need a second opinion?
Send the fault video, module label, PCB photos, voltage readings, controller model, and steps already tested to zhousumin@163.com.
Send diagnostic details