Question

Unilumin cob led wall not working

Answer 1

The possible causes and solutions for the "Unilumin COB LED Wall not lighting" issue are as follows:

Possible Causes

Power Supply Issue:

A faulty power adapter or mismatched power supply may result in the output voltage not meeting the LED wall's requirements.

Poor power cord contact, such as a loose plug or damaged wiring.

Damaged LED Beads:

COB LED beads may be damaged by overcurrent, overvoltage, or overheating.

Blackening, cracks, or black spots on the surface of the bead indicate a damaged bead.

Driver Circuit Issue:

The driver circuit controls the current and voltage of the LED light. Problems with the driver circuit may cause the LED wall to not light.

Components in the driver circuit (such as capacitors and resistors) may fail due to burnout or aging.

Wiring Issues:

The LED wall's wiring may not light due to looseness, disconnection, or short circuits.

Dust or dirt may affect the connection at the wiring connector, resulting in poor current conduction.

Environmental Factors:

Excessively high or low ambient temperatures, high humidity, and other factors may affect the proper operation of the LED wall.

Solutions

Check the Power Supply:

Use a multimeter to measure the power supply's output voltage to ensure it meets the LED wall's requirements.

Check the power cord for proper connection, loose plugs, or damaged wiring.

If the power adapter is faulty, replace it with a new one of the same specifications.

Check the LED Beads:

Observe the LED bead surface for blackening, cracks, or black spots. If so, the bead is damaged.

Use a multimeter to measure the resistance of the LED bead. If the resistance is infinite, the bead is damaged and needs to be replaced.

When replacing the bead, select the same model and install it according to the correct polarity.

Check the Driver Circuit:

Check the components in the driver circuit for signs of burnout or deterioration.

If the driver circuit is faulty, replace it with a new one of the same model.

Check the Wiring Connections:

Check the LED wall's wiring for loose connections, breaks, or shorts. Use a multimeter to measure the resistance of the circuit. If the resistance is infinite, there's a short circuit.

Clean the circuit connectors to ensure good contact.

Consider environmental factors:

Move the LED wall to a suitable environment, avoiding excessively high or low temperatures, high humidity, and other issues.

Answer 2

If the Unilumin COB LED wall doesn't light up, possible causes include a power failure, poor wiring, damaged lamps or driver circuits, and environmental factors. Check the power supply output and wiring connections, use a multimeter to test the lamp resistance (if it's infinite, it's damaged) and the condition of the driver circuit components, and verify that the ambient temperature and humidity are appropriate. If the lamps are blackened or have black spots, the driver is burnt, or the wiring is broken, replace the lamps and driver with the same specifications or repair the wiring.

Specific steps:

Power supply check: Use a multimeter to check whether the output voltage meets the LED requirements and confirm that the socket or plug is not loose or damaged.

Wiring check: Check that the wiring connections are secure and use a multimeter to measure the resistance (if it's infinite, it's a break).

Lamp and driver inspection: Observe the lamps for blackening and use a multimeter with the diode setting to check if they light up. If they don't light up, they're damaged. Check the driver circuit components for signs of burns.

Environmental adaptation: Move the fixture to an environment with appropriate temperature and humidity.

If the above steps fail to resolve the problem, contact a professional repair technician or official Unilumin customer service.

Answer 3

A wall display system consisting of a Unilumin Technology COB (Chip on Board) LED display or modules is not lighting up or displaying.

The following are some possible causes and troubleshooting suggestions:

I. Initial Inspection

1. Power Supply Check

- Verify that the power supply is functioning properly and that the power indicator is on.

- Check the power cord, distribution box, and circuit breaker for tripped circuit breakers.

- Use a multimeter to measure the supply voltage to ensure it is within the normal range (usually AC 220V or DC 5V, depending on the model).

2. Signal Source and Control System

- Verify that the sending card (such as Novastar, Linsn, etc.) is powered and functioning properly.

- Verify that signal cables, such as HDMI/network cables, are securely connected and may try replacing them.

- Check that the control software (such as NovaLCT, LedshowTW2017, etc.) is connected successfully and displays no errors.

3. LED Module Status

- Observe the COB module for any visible physical damage, such as burns, blackening, or an odor. - Try partial lighting: Disconnect some modules and test whether the remaining modules light up to determine if the fault is local.

II. Common Fault Causes

Possible Causes	Description
Power supply failure	Power supply damage, unstable voltage, overload protection
Control system failure	Damage to the sending card, receiving card, or HUB board
Signal transmission issues	Poor network cable contact, EMI interference, or excessive length
Module failure	COB package damage, IC failure, or poor soldering
Software configuration error	Incorrect sending card settings, resolution mismatch, or abnormal refresh rate

III. Recommended Procedures

1. Restart the system: Turn off the main power supply, wait 1 minute, and then power it back on.

2. Troubleshoot in sections:

- First, test the output of the sending card to see if it is normal (using an oscilloscope or replacement).

- Check whether the first receiving card or hub board is receiving a signal.

3. Contact Technical Support:

- Provide the product model, serial number, and a video of the fault.

- Contact Unilumin official customer service or an integrator for professional support.