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TFT (Thin-Film Transistor), also known as active-matrix, is a system in which the pixels on an LCD display are switched on by a transistor when it is strobed by the data. This gives a more reliable switching than the older STN displays, where the pixel is switched directly by the data lines. A capacitor is also added to keep the transistor switched on for longer after the data pulse has ended, giving a brighter display.
As to maintenance, there is nothing you can do if the unit has random bad pixels - the transistors are depositied on the glass.
Other failures that may be fixable are:
1) Poor contact between the LCD panel itself and the PCB (rubber strips) causing missing lines - needs realigning
2) Light too dim or out - replace fluorescent tube and/or inverter
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