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This should do it for you.<br />
<br />
<a href="http://www.irisvista.com/tech/laptops/Toshiba-Satellite-L645D-L640D/remove-laptop-motherboard-1.htm" rel="ugc">http://www.irisvista.com/tech/laptops/Toshiba-Satellite-L645D-L640D/remove-laptop-motherboard-1.htm</a>
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This should do it for you.

http://www.irisvista.com/tech/laptops/Toshiba-Satellite-L645D-L640D/remove-laptop-motherboard-1.htm [http://www.irisvista.com/tech/laptops/Toshiba-Satellite-L645D-L640D/remove-laptop-motherboard-1.htm]

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How can I open a Toshiba Satellite L645D S4040 laptop? &nbsp;Trying to get to fan / heat sink. &nbsp;<br />
<br />
Or how can I fix laptop getting hot on bottom after running for couple hours?<br />
<br />
Thanks.
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How can I open a Toshiba Satellite L645D S4040 laptop?  Trying to get to fan / heat sink.  

Or how can I fix laptop getting hot on bottom after running for couple hours?

Thanks.

How To Open Toshiba Laptop

A laptop or notebook is a portable personal computer with a clamshell form factor, suitable for mobile use. Although originally there was a distinction between laptops and notebooks, the former being bigger and heavier than the latter, there is often no longer any difference. Laptops are commonly used in a variety of settings, such as at work, in education, and for personal multimedia. A laptop combines the components, inputs, outputs and capabilities of a desktop computer, including the display screen, speakers, a keyboard, and pointing devices (such as a touchpad or trackpad) into a single unit. The device can be powered either from a rechargeable battery or by mains electricity from an AC adapter.

Laptops Notebooks

Hardware includes cell phones and other digital living devices, tablets, computers, servers, peripherals and components, printers and scanners, gaming consoles, networking hardware such as routers, hubs, switches and modems, storage devices and security equipment such as firewalls and other appliances.

Hardware

Components are those devices that are internal to a computer -- the PC boards, the central processor (CPU), the memory (RAM), disk and video controllers and so on.