Common LED Par Light Faults and Solutions


Hello everyone, I'm Jack Zhu from Grace Stage Lighting. Today, I'll introduce the common faults and solutions for LED Par Lights. Let's get started:

1. No Power, Display Screen Not Lighting Up

a. Check Fan Operation

  • If the fan is spinning, the power supply is likely fine, and the issue might be with the mainboard. Check if the mainboard's power input cable is disconnected and verify the ribbon cable between the mainboard and display board.

  • If the fan isn't spinning, check if the power supply's indicator light (usually green) is on. Ensure the input voltage (110V/220V) is correct and the power cable of the fixture is connected.

Common LED Par Light Faults and Solutions (10)
Common LED Par Light Faults and Solutions (9)

b. Check the Switching Power Supply Fuse

  • Inspect if the fuse in the switching power supply is blown.

2. Signal Not Controlled

a. Verify Console Signal

  • Check if the signal from the console is normal. Ensure that pins 1, 2, and 3 of the male and female connectors of the signal cable are soldered correctly.

b. Check Signal Cable to Fixture

  • Ensure that pins 1, 2, and 3 of the signal cable match with the fixture.

c. Use a Multimeter

  • Test the continuity of pins 1, 2, and 3 (1-to-1, 2-to-2, 3-to-3) of the signal input and output on the fixture. There should be no connection between pins 1, 2, and 3.

d. Inspect the Drive Mainboard

  • If the above checks are fine, open the rear cover and inspect the drive mainboard's signal IC for damage and ensure the signal cables are intact. Use a multimeter to check the consistency between the signal line input/output pins and the drive mainboard's connectors.

Common LED Par Light Faults and Solutions (8)
Common LED Par Light Faults and Solutions (7)

3. Digital Tube on Display Not Showing

a. Check Connections

  • Open the rear cover and ensure the ribbon cable between the drive mainboard and display screen is connected correctly and in the right position.

Common LED Par Light Faults and Solutions (6)
Common LED Par Light Faults and Solutions (5)

4. One Color of LED Beads Not Lighting (Typically 3, 6, 7, or 9 Beads)

a. Inspect Individual LED Beads

  • One of the LED beads might be burnt out. Remove the lens and use a multimeter in diode mode to test each bead's anode and cathode. If it lights up faintly, it's working; if not, it needs replacing.

b. Short Circuit Test

  • With the device powered and receiving a signal from the console, open the lens and short circuit a bead in the non-working row with tweezers to see if the others light up. If they do, the shorted bead is faulty.

c. Check the Aluminum Base Plate

  • If the above tests are okay, the issue might be a broken circuit in the LED bead's aluminum base plate.

Common LED Par Light Faults and Solutions (4)
Common LED Par Light Faults and Solutions (3)

5. All LED Beads of One Color Not Lighting

a. Inspect the Drive Mainboard

  • Open the rear cover and check for burnt marks on the mainboard's chips. Ensure the bead wire sockets are connected. Swap the order of the wires corresponding to the non-lighting color (e.g., swap green and blue) and test again. If the problem switches color, it's a drive circuit issue; if not, it's likely a bead board issue.

b. Check LED Bead Board

  • Inspect the soldering of the bead wires and use a multimeter to check each bead's anode and cathode.

Common LED Par Light Faults and Solutions (2)

6. Uncontrolled Signal Line with Flickering Fixtures

a. Signal Amplifier

  • Check if the signal output from the amplifier is stable or consider replacing the output port.

b. Elimination Method

  • First, verify the signal control of the first device in the line. Disconnect it from subsequent devices to isolate the issue.

c. Leapfrog Method

  • Use a longer signal cable to bypass a device in the chain to test the signal control of other devices.

Common LED Par Light Faults and Solutions (1)


As we've explored in this blog, maintaining LED Par Lights doesn't have to be a daunting task. From power issues to signal control challenges, the solutions are often straightforward if you know where to look. Remember, a non-responsive light might just need a check on the fan or a fuse replacement. Signal issues often boil down to proper cable connections and ensuring that everything is soldered correctly. It's amazing how often these simple checks can bring your lighting back to life.

When it comes to LED beads, it's all about the details. Whether it's a single color not lighting up or a whole row gone dark, a multimeter and a keen eye can save the day. And for those tricky signal line problems causing flickers, don't forget the power of process elimination or the leapfrog method.

At the heart of it, troubleshooting LED Par Lights is about understanding their components and being methodical in your approach. With these tips and a bit of patience, you're well-equipped to keep the show going, ensuring that these essential elements of stage lighting continue to shine brightly. Remember, when in doubt, start simple and work your way up - your LED Par Lights will thank you for it!

Frequently Asked Questions

What Are the Common Faults in LED Par Lights?

Answer: Common faults in LED Par Lights include power issues (like the light not turning on or the display screen not lighting up), signal control problems (where the light doesn't respond to control signals), and issues with individual LED beads, such as a whole color not lighting up or specific beads being unresponsive.

How Do I Troubleshoot a Non-Responsive LED Par Light?

Answer: First, check if the fan is working, indicating power supply issues. Then, inspect the fuse in the switching power supply. If these are fine, examine the connections between the mainboard and display board, and ensure all cables are intact.

What Should I Do If My LED Par Light's Signal Is Not Controlled?

Answer: Start by verifying the signal from the control console and ensuring that the signal cable connections are correct. Use a multimeter to test the continuity of the signal input and output pins. If these steps don't resolve the issue, inspect the drive mainboard's signal IC and cable connections.

How Can I Fix an Issue with LED Beads Not Lighting Up in My LED Par Light?

Answer: Check each LED bead with a multimeter to see if it's burnt out. Also, examine the bead's circuit on the aluminum base plate for any breaks. Swapping bead wires on the drive mainboard can help identify if the issue is with the beads or the board itself.

What Causes Flickering in LED Par Lights?

Answer: Flickering in LED Par Lights can be caused by unstable signal output from the signal amplifier or interference in the signal line. Try the elimination method by disconnecting and testing each light in the signal chain or the leapfrog method by bypassing a fixture to isolate the issue.

How Often Should LED Par Lights Be Serviced or Maintained?

Answer: The frequency of service and maintenance for LED Par Lights depends on their usage and environment. Regularly check for common issues like faulty LED beads, signal problems, or power supply issues. It's advisable to perform a thorough checkup at least once a year or more frequently if the lights are used extensively or in harsh conditions.


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