Graphics chip repair may be required when a laptop boots up but gives no output either on its own screen or when connected to an external monitor. The sort of graphics chip repair needed will depend on the type of the graphics chip, the cause of the problem and the connection type.
GPUs for laptops commonly have a non-standard slot due to size and weight constraints and may only accept new graphics cards identical to the original one.
In the majority of laptops the graphics chip is soldered to the motherboard. Over time, especially if the graphics chip is overheating, this connection can become loose. The graphics chip gradually separates from the motherboard, causing all kind of video problems including frequent freezing, overheating or a fuzzy or blank display.