Talking about the type and internal structure of LCD liquid crystal backlight tube and its driving connection method in the "Graphic Method" of the real thing-Home Appliances Maintenance-Huaqiang

In daily maintenance tasks, many people often ask me about the type of backlight tubes used in LCD TVs, their internal connection methods, driving techniques, and related issues. For a technician working in this field, understanding these concepts theoretically can greatly improve the speed and accuracy of diagnosing faults caused by the backlight system. However, a qualified technician should be familiar with these details. There are two main types of backlight tubes used in LCD TVs: EEFL (Electro-Optical Fluorescent Lamp) and CCFL (Cold Cathode Fluorescent Lamp). EEFL tubes only require one transformer to drive all the lamps connected in parallel, making them simpler in design. On the other hand, CCFL tubes typically need multiple transformers to power each individual lamp, especially in larger panels where multiple transformers are used. In this article, I will explain the different structures and driving connections for both EEFL and CCFL backlight systems in LCD TVs, using visual examples for better understanding. It's important to note that this article does not cover 12V backlight driving systems, as their working principle is very similar to 24V systems, and thus they have been omitted for brevity. The images provided are schematic diagrams created by the author. The discussion in this post is purely personal and does not represent any official views or positions. Thank you for reading! See the pictures below:

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