You are correct and you are correct. The copper tubing is part of the cooling system and are referred to as heat pipes because they transport heat from the processor to the fan and cooling fin area.
The laptop is shutting down from overheating. Now usually this is caused by the fins getting plugged up with lint and dust. Sometimes this lint/dust/hair buildup can get thick enough that if you try to blow it out it can jam up the cooling fan.
Now if the fan has seized due to bearing failure then it is a bit more complicated and expensive then if it was just plugged cooling fins.
Technically you will have to order a new cooling fan and then take your laptop apart to install it.
If you are pretty mechanical and technically savvy you might be able to get a few more miles out of the fan if you take it apart and clean and oil it with a good synthetic oil.
When I do these jobs for myself and others I always clean and reapply a good heatsink compound to the processor and sink.
If the unit is overheating due to circulation problems, the old grease used in the original heatsink compound can become dry and hard. Dry and hard does not transfer heat nearly so well.
Now if you want to fix it yourself then you should be somewhat technically savvy about delicate electronics. A good understanding of thermal dynamics cant hurt either. One stray static spark and that motherboard may never boot up again. So be very careful. I have gotten a number of laptops for repair because people were inside them.
Personally I only charge about 25 to 30 for a clean up job that includes reseating the heatsink with new compound. I charge roughly 280, depending on model, to put in new motherboards.
If I get the laptop in pieces I charge double. I really hate that as you have no idea what has been lost or hosed.
Note: Shops in your area may charge differently.
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The periodic shutdowns are usually associated with self-protective behaviour on cpus when their temperature reaches a threshold.
there's is no much to do but actually to replace the fan and if you have confirmed the failure you may need order this component if it's avaliable for sale directly fromthe manufacturer. by having a replacement item you will know what is part of the unit what's not to proper dismantle and replacement the failing component.
to replace and to get a better understanding of the internal components review the service manual found here
I know it's not the answer you were looking for but I hope it helps.
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Well you may have diagnosed the problem yourself. The fan, can be replaced, obtain spare parts direct from Sony PC's. Go to website and contact them,they will indicate where to go what to do. perhaps it is just in need of a Fan controller, OR a Laptop Cooler pad,
www.almico.com/speedfan.php
Link above is for speeedfan download and install you then have complete control over your fan, see if this helps.
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