shahid, first you have to be absolutely sure that it is the video chip. Try to work with an external monitor and see if that makes a difference. If that works you have either LCD problems, or inverter issues. If the external monitor has the same issue, than you know it is your video card. The video chipset is on the motherboard and cannot be replaced. You would have to purchase a motherboard to replace the current video "card". The only other thing that you could try is a reflow of the GPU. this will of course require some tools like a rework station or at least a hot air gun. Hope this helps, good luck
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