Toshiba Laptop overheating

Christopher Gehlke · Aug 2, 2014

So here's the deal. I got this Toshiba Laptop its a Satellite L875D-S7320, It has a AMD a6 in it for a cpu. A customer brought it in to us because it was shutting off randomly. We noticed that the CPU fan and fins were clogged. We cleaned those out and applied new grease to the cpu. Weirdly enough, the cpu was still getting hot. Here's the strange part, the part of the copper heatpipe that touches the CPU seems to feel hot (too hot) but if i follow the heatpipe down to the fan, it's cold (even the fan blows cold air), It gets hot enough that thermal shutdown occurs and it just shuts off. The CPU and the part of the heatsink that touches it gets HOT! (burns finger) before it shuts off. Isn't the part of the heatsink that sits by the fan supposed to get hot also if the CPU is hot? I'm thinking maybe the heatsink is at fault... What do you guys think? I had ordered another heatsink to replace this one. Also i have tried to just take the fan out of the equation, and the end with the fins still does not get warm. I'm definitely thinking the part of the heatsink that brings the heat over to the fan is faulty somewhere.

volcanoscout · Aug 2, 2014

It certainly sounds wonky - the fins should be cooler than main transfer pipe since they're designed to dissipate heat, but not cool. Might want to see if the pipe is touching anything else between the the CPU and the fins. Unless the pipe is cracked, which I think is most likely and may not be visible unless you have an xray available, it's possible that it's dumping the heat into something else enroute to the fins.

You should be able to identify the location of the dump or crack by checking the temp back along the pipe from the fins. You can probably do this without instruments just using your finger. The fault will be on the CPU-side of the point where the temp starts tapering off.

Christopher Gehlke · Aug 2, 2014

yeah thats what i experienced. it gets lower in temp the farther i go down the heatsink. The closer i am to the CPU the hotter it is, with the most heat coming from the part of the copper that touches the CPU. I do know for a fact even laptops at full load don't run that cold, I've had them blast out hot air. What causes the crack? just time? or would it be something inside the piping that has failed?

volcanoscout · Aug 2, 2014

Long exposure to heat and/or excessive temperature changes (hot-cold-hot-cold) can cause any metal to fracture. It may not be a single distinctive crack - if you get a large enough concentration of micro-fractures, the end result can be the same. In fact, either way, it'll start with a single micro-fracture and spread from there, kind of like a chip in a windshield spidering out. Usually it will start at the point of highest metal impurity. A fault there puts additional stress on the surrounding area, eventually causing the fault to spread.

Christopher Gehlke · Dec 9, 2014

volcanoscout :

this may sound weird, but i used a different cpu grease on the laptop and a new heatsink from ebay. weirdly enough the first time i tried the same thing happened. after getting it home (a friend let me use his grease), and trying again with new grease and a clean surface, it finally started working right without shutting off. the grease i used first off i tried on another system and it overheated to. wonder if the thermal grease was separated and not working well.

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Toshiba Laptop overheating

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