Troubleshooting Guide: Bumper LEDs Not Working (EVO Models)
Summary
EVO models are designed with LED indicators on the bumper to show the hook status. If these lights stop functioning, it can be frustrating. However, there are several potential causes for this issue. This article will guide you through understanding the system architecture, identifying common failure points, and providing step-by-step troubleshooting procedures to help you resolve the problem.
1. System Architecture and Wiring
Understanding the wiring and electronics involved is essential for accurate diagnosis. The LEDs are managed by dedicated electronics housed within the bumper.
Input from the Hook PCB to the LED Electronics:
- White Wire: This serves as the Ground (GND).
- Green Wire: This wire carries the signal.
- Red Wire: This is the power supply for the LED control electronics.
Output to the LED Strip:
- The LED strip consists of four wires corresponding to different colors: White, Green, Red, and Blue.
LED Power Supply
Power is sourced from the battery via a red wire. Note that if your model lacks LEDs, this wire will remain disconnected. The configuration varies by model:
- EVO2 Model: The red wire connects directly to the black wire of the LED strip.
- EVO5 to EVO25 Models: Here, the power supply goes through a step-down converter to reduce voltage from 24V to 12V, as the LEDs operate at 12V. **Caution:** Connecting to a 24V source can permanently damage the LED strip.
2. Diagnostic Procedures
To troubleshoot the non-functioning LEDs, follow these steps sequentially:
Step 1: Visual Inspection
- Ensure that the connector between the hook PCB and the LED electronics PCB is securely connected.
- Look for any cut, pinched, or stripped wires along the cable path.
- Inspect the black connector that links the signal and power wires from the hook PCB to the bumper for proper contact and condition.
Step 2: Substitution Test (Component Isolation)
- If possible, temporarily replace the bumper and hook with a functioning set. This will help you determine if the hook PCB is sending the correct signals to activate the LEDs. If the hook PCB is faulty, it will need replacement.
Step 3: Voltage Verification (Bumper Diagnosis)
Use a multimeter to check the voltages:
- Input to LED Electronics: Measure 3.3V between the white wire and the red/green wire.
- Output to LEDs: The LED that should be illuminated must receive 12V between the black wire and the corresponding color wire.
- Step-down Check (EVO5–25): If voltage is incorrect, measure between the battery negative and the red output wire of the step-down converter, which should supply exactly 12V.
Step 4: Direct LED Strip Test
- If the step-down converter is functioning correctly, disconnect the LEDs from the control PCB and power the strip directly to test each color individually. Important: Ensure the strip is powered at 12V only. If using a 24V battery, only draw the 12V output from the step-down converter.
3. Common Causes and Solutions
Once you have identified the faulty component(s) through the steps above, repairs typically involve replacing the damaged parts. Common issues include:
- Stripped or broken wires
- Poor connector contact
- Physical damage to the LED strip from impacts to the bumper
4. Additional Information
For further details on the various light signals emitted by the hooks and their meanings, please refer to our dedicated article: [here].
By following this guide, you should be able to diagnose and resolve issues with your bumper LEDs effectively. If you continue to experience problems, please reach out to our customer support team for further assistance.