This work is a professional, hands-on resource for electronic repair, focusing on the repair of liquid crystal displays (LCDs) and LCD TVs. It highlights the practical repair of LCD screens from major brands such as Samsung, Huaxing Optoelectronics, LG, BOE Technology, and Chi Mei. The resource first explains the power circuit and control principles of LCD TVs, outlines the core voltage parameters and detection methods of logic boards. It then lists common LCD screen faults by brand, such as gray screen, horizontal lines, screen flicker, color deviation, and provides corresponding technical modification methods and practical examples. It details the steps, key points, and troubleshooting approaches for core repair operations like disconnecting Y, short-circuiting CKV, disabling protection, and applying cable strips. It also covers specialized repair techniques for different models of LCD screens. The content is both theoretical and practical, making it a useful reference for LCD screen repair professionals.