The **CCT-49K760-R** is a specific electronic sub-assembly, typically identified as a **Constant Current LED Driver Board** (or power supply board) used primarily in large-format LED displays and commercial signage. Below is a breakdown of the electronic components and technical specifications associated with this part. --- ### 1. Technical Specifications Overview This board is designed to regulate the power flow from a main power supply to LED strings, ensuring consistent brightness and thermal stability. | Feature | Specification | | :--- | :--- | | **Component Type** | LED Backlight Driver / Constant Current Board | | **Output Channels** | Multi-channel (Typically 4 to 8 channels) | | **Input Voltage** | ~24V DC (Standard for commercial displays) | | **Current Regulation** | Precision Constant Current (CC) mode | | **Protection Circuits** | Over-voltage (OVP), Short-circuit (SCP), Over-temperature (OTP) | --- ### 2. Key Electronic Parts & Functionality The board consists of several critical stages that manage the electricity: #### A. Power Management ICs * **PWM Controllers:** These chips manage the Pulse Width Modulation (PWM) to dim the LEDs or adjust brightness levels without flickering. * **Boost Converters:** Since LED strings often require a higher voltage than the 24V input, these components "step up" the voltage to the required level (e.g., 60V–100V). #### B. Passive Components * **Electrolytic Capacitors:** Used for filtering input noise and smoothing the output voltage to prevent LED flicker. * **Inductors (Chokes):** Large wire-wrapped coils used in the boost stage to store energy and convert voltage efficiently. * **SMD Resistors:** High-precision resistors used for current sensing to ensure the "Constant Current" remains within 1% of the target value. #### C. Connectivity * **Input Header:** Usually a 12-pin or 14-pin connector receiving power and "Enable/Dimming" signals from the main logic board. * **Output Headers:** Multi-pin connectors (often labeled LED+ and LED-) that distribute current to the backlight strips. --- ### 3. Common Failure Points If you are troubleshooting this specific board, these are the most likely electronic parts to fail: 1. **MOSFETs:** The switching transistors can overheat and short-circuit if the LEDs draw too much current. 2. **Diodes:** Schottky diodes in the boost circuit are under high stress and may fail open or short. 3. **Capacitors:** Over time, the electrolyte can dry out, leading to unstable output and flickering displays. ---