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CPU fan not blowing out hot air

post #1 of 21
Thread Starter 
Hey guys, I have a pretty new yet out of warranty laptop that shuts down after a few seconds.
The laptop is a Toshiba Satellite C875D-S7330. It has an AMD A4 4300M APU in it. I pretty much figured that the APU is overheating and it's shutting itself down. The laptop is practically brand new, and hasn't been used for at least a year until recently. The warranty ended back in January and Toshiba wants $250 for a replacement. So with that being the case, I opened up the laptop to see what the problem was.

With it being a new laptop there wasn't much dust on the fan. I cleaned it anyway and reapplied new thermal paste. That didn't help because it was still overheating.
The spot where the APU is was very very hot. When I opened it back up, I decided to blow cool air onto the APU itself. The laptop lasted longer and actually booted to Windows.

Now here's the thing. The fan spins, however only cool air comes out. The copper pipe that leads from the APU to the fan is super hot, however no hot air is coming out the vent.
So my conclusion is that the fan is not dissipating the heat properly, and I have no idea what to do now.
post #2 of 21
Sounds more like a disconnect between the heatpipe to the fins that the fan would dissipate heat from
    
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post #3 of 21
Thread Starter 
Thanks for the reply. I just checked the entire heatsink. Both the fan and the copper pipe are connected well. I didn't see anything that would indicate otherwise.
The fan spins correctly and works fine. It's just really strange that the copper pipe heats up, but the fan is not blowing the heat out. I've tightned it down on the APU as best as I could, but that didn't help.

Could it be that I got a defective heatsink or something?
post #4 of 21
Sounds like a bad heatsink. Might want to consider replacing it and check back. That kind of thing can go wrong. Also, you can technically use the Magnuson-Moss Warranty Act if they want you to pay an outrageous amount for a replacement part.
     
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post #5 of 21
It's hard to just have defective aluminum fins in any sense, the only thing that makes any sense is the tube is disconnected from the fins or was put on wrong.
    
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post #6 of 21
Yeah, there's science in the heatpipe and I wont begin to attempt to explain it lol Im too tired.

Heatsinks are relatively cheap for the most part
    
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post #7 of 21
Thread Starter 
Finally some answers. I agree that the heatsink must've been assembled incorrectly or something.
The laptop was bought a year ago but wasn't used until last month. I've decided to order a replacement heatsink just now.

I'll have to wait to see if this works out. If not then, I don't really know.

Also Toshiba doesn't want $250 for a simple replacement heatsink. They want that money as a diagnostic fee. So yeah, I'd rather spend the little money and time to fix this on my own.
post #8 of 21
Take it apart and clean it.
if that don't work buy a new fan off eBay. Btw they are cheap 10$ at most I know cus I replaced mine in a hp.
post #9 of 21
Thread Starter 
Quote:
Originally Posted by reapersakiller View Post

Take it apart and clean it.
if that don't work buy a new fan off eBay. Btw they are cheap 10$ at most I know cus I replaced mine in a hp.

I said that the laptop is like new and that I already cleaned the fan, which wasn't really that dirty to begin with.
I've also already ordered a new heatsink. However not as cheap as $10.

The problem is the fan not blowing away the heat. It's just blowing cool air, which would indicate to me that the heat from the copper pipe is not transferring like its supposed to...I think.
I checked the copper pipe that leads into the (I guess aluminum) fins. It's in there pretty good. I'm not sure if the pipe is actually connected to all of them. The thing won't budge, and I can't see that well in there to scruntize it.
post #10 of 21
When u get the new heasink in u could put some of these to help .http://www.ebay.com/bhp/mosfet-heatsink
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