The present invention discloses an array substrate, a liquid crystal display (LCD) device and methods for manufacturing and repairing the array substrate. Said array substrate for thin film transistor (TFT) LCD comprises one or more pixel electrodes, gate lines and data lines; the crossover of said gate line and said data line is formed with a parasitic capacitor; said data line is also provided with slit part; and said slit part is overlapped with the gate line to form a protective capacitor which is in parallel connection with said parasitic capacitor and of which the voltage resistance is less than said parasitic capacitor. Because the data line is provided with the slit part which overlaps the gate line to form the protective capacitor which is in parallel connection with the parasitic capacitor and of which the voltage resistance is less than that of the protective capacitor, and because the data line is positioned on the top layer, the late stage repair of the present invention becomes easier.