HELP please! Overheat Sony All-in-One!

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wantlearn

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Mar 8, 2017
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1st of all, know nothing about PC. Just like to tinker!
My Sony VGC-LS30E all-in-one is overheating. Opened it up to re-apply thermo paste only to see the heat sink system covers 3 chips: Intel CPU, Nvidia Graphic, and Intel-QG82945PM.
1. What is the function of Intel-QG82945PM?
2. Why 'grey' thermo paste was used for CPU and 'pink' thermo pad for the other 2 chips by Sony? Differences?
3. Can all 3 chips use Arctic Silver 5 instead of pads? If so, what must I watch out for?
Looking for advise/feedback/assistance. Care to share your knowledge?
 
Solution
Aeacus
1. Intel-QG82945PM is MoBo's northbridge BGA chipset.
Further reading: https://en.wikipedia.org/wiki/Northbridge_(computing)

2. My best guess is that grey thermal pad is rated for higher temps than pink thermal pads over IGPU and northbridge.

3. I don't advise using thermal paste. You'd be better off using thermal pad. Like this one,
link: https://www.arctic.ac/eu_en/thermal-pad.html
Reason for that is simple, thermal paste needs pressure on it to achieve the best thermal conductivity while thermal pads are used on places where there's bigger gap (0.5mm or more) between the chip and heatsink. Thermal pads are common in laptops and AIO PCs while thermal paste is common on desktop PCs.
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Aeacus

Aeacus

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1. Intel-QG82945PM is MoBo's northbridge BGA chipset.
Further reading: https://en.wikipedia.org/wiki/Northbridge_(computing)

2. My best guess is that grey thermal pad is rated for higher temps than pink thermal pads over IGPU and northbridge.

3. I don't advise using thermal paste. You'd be better off using thermal pad. Like this one,
link: https://www.arctic.ac/eu_en/thermal-pad.html
Reason for that is simple, thermal paste needs pressure on it to achieve the best thermal conductivity while thermal pads are used on places where there's bigger gap (0.5mm or more) between the chip and heatsink. Thermal pads are common in laptops and AIO PCs while thermal paste is common on desktop PCs.
 
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wantlearn

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Mar 8, 2017
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Thanks to Aeacus for your response. Not even sure that I am replying to you. Forgive me if I messed it up.
1. I try to read and understand the link on Intel-QG82945PM but....it flew right over my head! Sad!
2. I agree with your 'guess' which makes a lot of sense.
3. I will get the pads as suggested. But how to tell what thickness to buy though? If too thin, can I use 2 layers? If too thick, can I press harder to force-fit it? And....since I already bought Arctic Silver 5, can I or should I consider using combination pad-n-paste?
Again, thank you for your time and expertise.
 
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Aeacus

Aeacus

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You're welcome.

1. To put it short, every MoBo has chips on it for processing the data between components. Smaller PCs (AIO PC, laptops, notebooks etc) have smaller MoBos and they only have one set of chipsets that is called as northbridge. Desktop PCs in the other hand, have bigger MoBos and since MoBo can do more (e.g overclocking, multi-GPU setup etc), they also have a second set of chipsets that is called southbridge.

Here's a great image showing the purpose of northbridge and shoutbridge. Do note that on smaller PCs, northbridge and shoutbridge are combined into northbridge only.
image:
Motherboard_diagram.svg

2. I can't think any other reason besides thermal conductivity why the thermal pads are of different color.

3. Try to measure the thickness of your current thermal pads.
If that proves too difficult, you can go for 0.5mm thick thermal pads and use 1 - 3 layers if needed. Applying more than 3 layers (thickness of more than 1.5mm) will work against thermal conductivity and your thermal pads would act as a thermal insulators, trapping too much heat inside them.
I suggest starting off by applying 1 layer of 0.5mm thick thermal pad. Thermal pads also need some force to be applied them so that there won't be air gaps between the chip and heatsink.
Here's a little bit of further reading: http://www.tomshardware.com/reviews/thermal-paste-heat-sink-heat-spreader,3600-2.html

As far as using thermal paste with thermal pads, i don't advise that. Either only only thermal paste or thermal pad, but not both at the same time.
 
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wantlearn

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Mar 8, 2017
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Allow me to thank you, Aeacus, again for your quick response.
One would think that a picture helps explaining things. Not in this case! I still don't know why that extra Intel chip was there. :??: Please don't laugh at me.
I came here to learn. Glad that this site has good instructors like you and....I have learned a lot. I am a happy camper already and will be happier once my AIO is running again.
I wish you the best!

 
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