Detailed Description

Universal 4-lamp Cold Cathode Fluorescent Lamp (CCFL) backlight inverter board designed for 15" to 24" LCD monitors, displays, and industrial equipment repair. Operates from 12VDC nominal input (10V-15VDC) and steps up to high-voltage AC to power two pairs of CCFL tubes via dual ferrite transformers (marked XSJ-EEL19002). Features 4 miniature 2-pin high-voltage output sockets (CN2 through CN5) and a clearly labeled 6-pin center input header (VCC, VCC, ON/OFF, Vadj, GND, GND). Great for replacing failed monitor inverters, LCD repair, or powering CCFL/UV cold cathode tubes for custom hobby and lab illumination projects. Measures approx. 5.5" x 1.6". Brand New Surplus!

A web search produced these specs, which we have not verified.

How It Works & Pinout Breakdown

• Center Input Connector (CN1 - 6 Pin Header):
• VCC, VCC (Pins 1 & 2): Main DC power input, typically 12V DC (nominal 10V–15V DC, smoothed by the onboard 220µF 25V electrolytic caps).
• ON/OFF (Pin 3): Enable / inhibit logic control signal. Applying a logic high (+3.3V to +5V) turns the high-voltage inverter on; pulling low (0V/GND) turns it off.
• VAD / Vadj (Pin 4): Voltage / Brightness Adjust (dimming line). Takes an analog 0–5V control voltage or PWM duty cycle to vary the tube brightness.
• GND, GND (Pins 5 & 6): Common power ground (0V).
• High Voltage Lamp Ports (CN2, CN3, CN4, CN5):
• Two standard 2-pin miniature JST-style high-voltage sockets on each side. Each side connects to the upper and lower dual CCFL tube pairs inside an LCD panel assembly.
• Driven by two independent high-voltage step-up ferrite transformers (XSJ-EEL19002).
• Safety / Open-Lamp Protection:
• Most controllers on these boards feature strike-sensing and open-lamp shutdown: if all four lamps aren't plugged in or if a tube is cracked/open, the protection circuit shuts down the high voltage after 1–2 seconds to prevent transformer arcing or fire hazards.