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 have asked me about the type of backlight tubes used in LCD TVs, their internal wiring configuration, driving methods, and related issues. For a professional technician, understanding these concepts is essential to quickly and accurately diagnose problems related to the backlight system. LCD TVs typically use two types of backlight tubes: EEFL (External Electrode Fluorescent Lamp) and CCFL (Cold Cathode Fluorescent Lamp). EEFL tubes require only one transformer to drive all the lamps connected in parallel, making them more efficient. On the other hand, CCFL tubes usually need multiple transformers to power each lamp individually, especially in larger displays. This article aims to explain the structural differences and driving connections of both EEFL and CCFL backlights in LCD TVs. The diagrams provided illustrate various configurations. It's worth noting that this content does not cover 12V backlight systems, as their working principle is similar to 24V systems, and thus they are omitted for simplicity. The images shared here are schematic representations, and the discussion is based on personal experience. They do not reflect any official views or positions. Thank you for reading! See the pictures below:

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