If you’re new to troubleshooting or our guide doesn’t quite cover your specific issue, we recommend reaching out to your LED moving head light supplier. They can offer direct assistance and support, especially since your lights likely come with a warranty service (typically one or two years).
Symptoms: The light shows no signs of life after connecting to power. The display screen is off, the light source doesn’t turn on, and the motors don’t move.
Common Causes:
Power cable issues or improper connection.
The internal fuse is blown.
The power supply module has abnormal output voltages (e.g., incorrect 32V, 12V, or 5V).
Main circuit board malfunction.
Repair Methods:
First, check the power cable. Ensure it’s in good condition and securely connected.
Open the fixture’s base. Inspect the power supply module’s fuse. If it’s blown, replace it with the correct type.
Use a multimeter to test the power supply module’s output voltages. Confirm they are within normal ranges.
Check the indicator lights on the main circuit board (red for power, yellow for CPU, green for signal). Their status helps determine if the board is functioning correctly.
Symptoms: The fixture powers on and resets normally, but the light source itself does not illuminate.
Common Causes:
The light source (lamp/LEDs) is damaged or old (e.g., appears white or blackened).
The light source was not installed correctly.
Ignitor/driver malfunction (for lamp-based fixtures) or LED driver issue (for LED fixtures).
The main board’s thermal switch is open-circuited.
Abnormal 12V voltage output from the power module to the ignitor/LED driver.
Repair Methods:
Visually inspect the light source. If it appears white, blackened, or otherwise damaged, replace it.
For lamp-based fixtures, check the ignitor wiring for burn marks. Replace the ignitor if necessary.
Check the thermal switch for an open circuit.
Measure the 12V voltage from the main board to the light source’s ignition/driver point. Confirm it’s normal.
Symptoms: The light source works for a while, then automatically turns off or flickers, sometimes turning back on later.
Common Causes:
The light source is aging or of poor quality.
Cooling fan malfunction or excessive dust accumulation, leading to poor heat dissipation.
The thermistor is aging.
Wiring terminals are aged or have poor contact.
Unstable output from the power supply module.
The fixture enters automatic protection mode after not receiving control signals for an extended period.
Repair Methods:
Replace any aging or low-quality light sources.
Check the cooling fan for proper operation. Clean dust from heat sinks and vents (recommended monthly).
Inspect and replace aged thermistors or wiring terminals as needed.
Ensure your power supply output is stable.
If the fixture entered protection mode, send a control signal from your DMX console to resume operation.
Symptoms: The light source explodes during use, or the fixture immediately blows its fuse/trips a circuit breaker upon power-on.
Common Causes:
The power supply voltage is too high (e.g., above 240V).
The light source has exceeded its lifespan (e.g., over 50,000 hours).
Defective light source quality.
Ballast/driver short circuit or excessive inrush current on startup.
Light source grounding fault or internal high-voltage short to ground.
Repair Methods:
Check the power supply voltage. Ensure it is within the normal operating range. Install a voltage stabilizer if necessary.
Replace light sources that have reached their end-of-life or are defective.
Inspect the ballast/driver for any signs of short-circuiting.
Check for any high-voltage short circuits to ground within the fixture.
Symptoms: The fixture powers on and the light source works, but it cannot be controlled via a DMX console.
Common Causes:
Incorrect DMX address setting on the fixture.
Signal cable connection issues (e.g., reversed polarity, poor contact, damaged cable).
The DMX signal IC (e.g., 75176 chip) is damaged.
Main board or display board malfunction.
“Air gaps” in the DMX signal chain (loose connections) or faulty cables.
Repair Methods:
Verify that the DMX address set on the fixture matches your controller’s settings.
Check DMX signal cable connections. Ensure they are correct, secure, and free from looseness or damage.
Try replacing the DMX signal cable, as cable faults are a common culprit.
Check if the DMX signal IC is damaged.
Test with another fixture using the same controller to determine if the issue is with the fixture or the controller.
Check the DMX signal input indicator light on the display panel; it should be flickering if a signal is present.
Symptoms: The fixture’s Pan or Tilt movement is not smooth, it jerks, and cannot position correctly, or functions like gobo, color, prism, or focus wheels are stuck or losing steps.
Common Causes:
Motor short circuit leading to IC damage (e.g., 3711 chip).
Main board damage.
Gobo wheels, color wheels, or other component mounting screws are loose or missing.
The hall sensor and magnet are misaligned.
Component deformation causes friction, or a detached part, causing jamming.
Stepper motor fault, leading to a stuck motor shaft.
Drive belt slipping, loose, or broken.
Bearings lack lubrication.
Excessive dust on optocouplers prevents infrared light from sensing correctly.
Repair Methods:
Inspect and replace any damaged motors or related ICs.
Tighten mounting screws on gobo wheels, color wheels, and other moving parts.
Readjust the distance and position of the Hall sensor and magnet (typically 2-3mm).
Check for deformed or detached components. Straighten, reinstall, or replace as needed.
Inspect the drive belt for looseness, slipping, or breakage; adjust or replace.
Regularly lubricate moving parts like Pan/Tilt motors, gears, and bearings. Use silicone-based or PTFE-based lubricants, avoiding petroleum-based products.
Clean dust from optocouplers to ensure the infrared light path is clear.
Try reprogramming the fixture or running a calibration routine.
Symptoms: The fixture’s display panel is dark or shows no content.
Common Causes:
The display panel itself is damaged.
The ribbon cable connecting the display panel is loose or damaged.
Repair Methods:
Check if the display panel is damaged. Replace if necessary.
Inspect the 7-pin ribbon cable connecting the display panel for looseness or damage. Re-seat or replace the cable.
Symptoms: Different fixtures display inconsistent colors, or a single fixture’s color output is inaccurate.
Common Causes:
Incorrect color settings or calibration.
Individual LED chips are damaged or burnt out.
Incompatibility between fixtures in a setup.
Repair Methods:
Check and calibrate the fixture’s color settings. Ensure all units have consistent DMX mode settings.
Inspect individual LED chips for signs of damage or burnout. Replace the LED board if necessary.
Ensure all fixtures are compatible and adjust settings to achieve uniform color output.
Symptoms: The fixture’s exterior casing becomes excessively hot, potentially leading to performance degradation or automatic shutdown.
Common Causes:
Poor ventilation around the fixture.
Operating at high power for extended periods.
High ambient temperatures in the environment.
Repair Methods:
Ensure the fixture is placed in a well-ventilated area with sufficient airflow.
Avoid placing fixtures near heat sources or in direct sunlight.
Consider reducing power output or using additional external cooling fans if possible.
Ensure internal fans are clean and functioning correctly.
Symptoms: The light intensity is unstable, appearing to dim or flicker.
Common Causes:
Unstable power supply.
Electrical interference in the circuit.
Loose or damaged wiring within the fixture or signal chain.
Dimmer or control system malfunction.
Repair Methods:
Check for a stable power supply to the fixture.
Inspect the circuit for loose connections or damaged wiring.
Troubleshoot for interference from other electronic devices or power lines.
If the issue persists, the dimmer or control unit might be faulty and require replacement.
Verify dimmer settings are correct on your console.
Regular maintenance is key to minimizing faults and extending the lifespan of your moving head wash lights.
Regular Cleaning: Periodically wipe down the fixture’s exterior. Use a soft brush or compressed air to clean lenses, heat sinks, fans, and internal components of dust and debris. For LED fixtures, isopropyl alcohol can be used to clean optics.
Lubricate Mechanical Parts: Regularly lubricate moving parts like Pan/Tilt motors, gears, and bearings. Use silicone-based or PTFE-based lubricants, and avoid petroleum-based products which can damage plastics.
Inspect Wiring: Routinely check all power and DMX signal cables for wear, cracks, looseness, or corrosion. Replace damaged cables promptly.
Firmware Updates: Periodically check the manufacturer’s website for new firmware updates. Installing these can improve fixture performance, add features, and enhance reliability.
Proper Storage and Transport: When not in use, store fixtures in their original packaging or protective cases in a dry, dust-free environment. During transport, ensure they are securely packed to prevent damage.
Pre and Post-Show Checks: Before a show, allow fixtures to preheat (e.g., run at 50% brightness for 30 minutes). After a show, let fixtures cool down for 15-20 minutes before disconnecting power, avoiding abrupt shutdowns.
Seek Professional Help: For complex faults or uncertain issues, it’s always best to consult professional lighting technicians or contact the manufacturer for assistance. Avoid self-repair if you’re unsure, as it can lead to further damage or safety risks.
By following these detailed troubleshooting steps and preventative maintenance measures, you can significantly enhance the reliability of your moving head wash lights and ensure your stage lighting system always performs at its best.
We look forward to receiving your request and will contact you via your email within 48 hours.