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Topic # 128785 23-Aug-2013 10:56
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One of my Dell D630's has been overheating so I decided to take it apart and give it a clean. No problem there, I've done plenty of desktops and a couple of laptops in my time.

After removing the heatsink I clean the fan (think with dust) and its all good. However the heatsink has three 'prongs' to it, two have thermal pads covering what I assume is the GPU and something else, and the third which sits over the CPU has a very thick layer of what I assume was paste. I'd guess its about 2-3mm think certainly way more than you could ever get using a normal paste.

Its also rock hard and no amount of Isopropyl alcohol is going to shift it. I can clean the area directly above the CPU (where its much thinner) but around it is impossible. It looks like it was soft 'pad' to start with which squeezed out the sides under pressure, although its still a perfect square on the heatsink.

I've not seen this before, so am I right in thinking it was originally a pad of some sort (its the usual thermal paste grey colour) or is it likely to be something else ?

I covered the heatsink and CPU with my usual paste and put it all back together but my CPU temps are really high so I'm worried there isn't enough of a 'connection' with the standard paste. I read the pads are put on the other two 'prongs' simply because there isn't enough height in motherboard to reach the heatsink properly, so could this be the issue with the CPU as well?

Does that explanation make sense ? If so, what should I be using other than thermal paste if it needs to be higher ?

Thanks.



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  Reply # 883292 23-Aug-2013 11:53
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Yeap instead of thermal paste they occasionally use this kind of foam pad - I guess to take care of clearance issues between heatsink and the chip. Usually find it on the north bridge/low end gpu(I think) of most cheap laptops.

Before you remove it, figure out if the heatsink will reach the chip when clamped down, or there is still some distance between. Not sure what the stuff is called but you will be able to find it on ebay surely.




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  Reply # 884850 26-Aug-2013 17:02
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Its not the pads I'm worried about, its the paste (or what looks like paste) on the CPU heatsink itself. It looks like a solid block of paste which melts around the CPU on contact. 

I'm wondering if I need a pad for the CPU instead of the old paste.

Thanks

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  Reply # 884936 26-Aug-2013 19:38
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You could try a can of freeze & maybe chip it off

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  Reply # 885237 27-Aug-2013 13:31
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Take a blade out from a hobby/stanley knife or similar & scrape it/cut it off with that, on both the the heatsink & CPU
Then use Spray & wipe , glass cleaner or similar household cleaner to get the residual off. Isopropyl wont be a strong enough solvent.

Ive done this many times, on PC's but not laptops.



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  Reply # 885366 27-Aug-2013 15:27
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Is there not a problem with the heatsink if I scratch it with a 'blade' ? Ive always thought both surfaces need to be as flat as possible and any scratches will render the heatsink unusable.

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  Reply # 885376 27-Aug-2013 15:52
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martyyn: Is there not a problem with the heatsink if I scratch it with a 'blade' ? Ive always thought both surfaces need to be as flat as possible and any scratches will render the heatsink unusable.


Use a good blade, carefully, and it won't scratch anything.  I find methylated spirits actually does a good job of getting heatsink paste off (and leaves no residue)



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  Reply # 885381 27-Aug-2013 15:57
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Ok, Ill give it a crack.

In terms of what I replace it with though, if there is a gap between the heatsink and the CPU are there paste 'pads' I can buy instead of the pads I see on the other parts of the heatsink ?



 

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  Reply # 886872 30-Aug-2013 09:00
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Hi Martyyn,
I can see you use the same motherboard like I do, how is the on-board graphics working on DVBT?

There is a very old debate about nVidia / ATI and how they can do the de-interlacing of NZ signals and when I built the htpc (many years ago) the nVidia was definetely the winner.

unfortunately the nVidia card stopped working (for some reason) and I switched to on-board graphics which (as expected) provides awfully low picture quality (picture is extremely jugged when panning - dropped frames?).

can you please help with the driver version and MediaPortal codecs you use?




mobo Intel DH55PJ, RAM: 4GB RAM, Nova-T 500 HD + Avermedia Trinity tuner card, Geforce 520 video, 120GB SSD Sandisk + 640 WD + 1000SG, Win7 Home Prem 64-bit, Media Portal 1.15.0; BTC 9019URF Cordless Keyboard, Panasonic 55" (HDMI cable), HTPC Case Silverstone Grandia GD05B.




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  Reply # 888169 2-Sep-2013 10:51
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aucklander:
I used to use CoreAVC, with AC3 and ffdshow and had no problems at all playing dvb-t, bluray, you name it. The CPU was never more than 25% and I never understood what all the fuss was about with ATI. Maybe I was lucky.

Now Im on W7 and just use the codec pack which comes with Mediaportal. Cant remember its name now, but again it plays everything I throw at it without needing anything else.

heatsink:
Well its gone from bad to worse. After cleaning everything again and putting it all back together. I pressed the power button, there was a beep and then nothing. A black screen, with no hard drive going, not bios screen or anything.

The fan runs but I cant get it to start at all now :(

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