thinkpads.com Support Community Forum Index Bill Morrow's thinkpads.com Open Forum - The Original Thinkpad Support Forum
Follow ThinkpadsForum on Twitter
 Support this forum, shop at newmodeus.com
 Support the forum, shop at newmodeus.com
System backups occur about 7:00 am EDT and last about 10 minutes. This will slow performance. RSS feeds have been added to the forum.
Donate if you wish to:
bill at thinkpads dot com

It is currently Fri Jul 25, 2014 2:59 pm

All times are UTC - 5 hours




Post new topic Reply to topic  [ 13 posts ] 
Author Message
PostPosted: Sun Feb 19, 2012 11:55 am 
Offline

Joined: Wed Feb 01, 2012 12:53 pm
Posts: 38
Location: Minneapolis, MN
On the heatsink for my T400, thermal grease was used for the CPU and the GPU. There is a third component though covered by the heatsink - which I'd have to look up to know what it is and does. Anyways, instead of thermal grease, there is a thermal pad there.

In removing the heat-sink to upgrade the CPU, I've noticed the thermal pad got slightly dusty and there may even be what appears to be a fine hair or thread of some sort stuck on it.

Should I purchase a replacement, and if so - where can I purchase one? Thermal pads can't be cleaned can they?

I plan to use Arctic Silver 5 on the CPU and GPU instead of the poor quality grease that was there before and have used Arcticlean remover and the purifier to get rid of the existing grease on the CPU and GPU and will apply Arctic Silver in between those components and the copper heat-sink, but the heat-sink has been designed to use a thermal pad on the third component, otherwise I'd just remove it and use arctic silver for it too. So I need to either use the current one or buy a new one.

Your help is appreciated. :)


Top
 Profile  
 
PostPosted: Sun Feb 19, 2012 4:30 pm 
Offline
Contributing Member
Contributing Member

Joined: Sat Oct 13, 2007 9:47 pm
Posts: 528
Location: Pullman, WA
Try cleaning it off with some rubbing alcohol and a something that won't leave any fibers/lint behind.

_________________
7mm SSD list
Guide to fixing T4x GPU problems via reflow

Current: T420s
Former: X301, X61t, T40


Top
 Profile  
 
PostPosted: Sun Feb 19, 2012 4:48 pm 
Offline

Joined: Wed Feb 01, 2012 12:53 pm
Posts: 38
Location: Minneapolis, MN
How about a coffee filter?

Is 70% isopropyl alcohol strong enough, I don't think they have 90% or above locally, I'd have to order it.

I also have Arcticlean Purifier.... which I think is primarily alcohol.


Top
 Profile  
 
PostPosted: Mon Feb 20, 2012 11:08 am 
Offline
Contributing Member
Contributing Member

Joined: Sat Oct 13, 2007 9:47 pm
Posts: 528
Location: Pullman, WA
MartinBrice wrote:
How about a coffee filter?

Is 70% isopropyl alcohol strong enough, I don't think they have 90% or above locally, I'd have to order it.

I also have Arcticlean Purifier.... which I think is primarily alcohol.


70% is just fine, the rest is just water (as long as you don't have a dyed one). I would avoid using the Arcticlean on it just because it would be overkill and I don't know if it's safe for thermal pads.

_________________
7mm SSD list
Guide to fixing T4x GPU problems via reflow

Current: T420s
Former: X301, X61t, T40


Top
 Profile  
 
PostPosted: Mon Feb 20, 2012 6:25 pm 
Offline

Joined: Wed Feb 01, 2012 12:53 pm
Posts: 38
Location: Minneapolis, MN
I cleaned it with alcohol, but that removed a tiny amount of the material itself. To make up for it, I applied a very thin layer of Arctic Silver to the component.

While I don't usually mix thermal products, I figured that in this case it probably wouldn't hurt it.

Put everything back together and booted... works. Will have to wait until I know how well it's cooling. The only snag I ran into was that I had trouble remembering where the antenna (presumably wifi) cables go. I'll have to go back in there and fix it once I figure out where they're supposed to go.


Top
 Profile  
 
PostPosted: Mon Feb 20, 2012 11:10 pm 
Offline

Joined: Wed Feb 01, 2012 12:53 pm
Posts: 38
Location: Minneapolis, MN
Anybody know what that chip is anyways?


Top
 Profile  
 
PostPosted: Tue Feb 21, 2012 1:58 pm 
Offline
Contributing Member
Contributing Member

Joined: Sat Oct 13, 2007 9:47 pm
Posts: 528
Location: Pullman, WA
MartinBrice wrote:
I cleaned it with alcohol, but that removed a tiny amount of the material itself. To make up for it, I applied a very thin layer of Arctic Silver to the component.

While I don't usually mix thermal products, I figured that in this case it probably wouldn't hurt it.

Put everything back together and booted... works. Will have to wait until I know how well it's cooling. The only snag I ran into was that I had trouble remembering where the antenna (presumably wifi) cables go. I'll have to go back in there and fix it once I figure out where they're supposed to go.


As long as it didn't create pits or cracks it should have been fine.

_________________
7mm SSD list
Guide to fixing T4x GPU problems via reflow

Current: T420s
Former: X301, X61t, T40


Top
 Profile  
 
PostPosted: Tue Feb 21, 2012 2:49 pm 
Offline

Joined: Wed Feb 01, 2012 12:53 pm
Posts: 38
Location: Minneapolis, MN
It gave it a slightly less than perfectly smooth texture. This was another reason I applied a very thin layer of Arctic Silver.

I still don't even know what the chip is.

You can see it here:

Image

It's the chip almost dead center in the board. If you look at the CPU socket, to the immediate right there are 2 major chips. The one to the immediate right of the CPU (and in the picture with thermal grease on it) - I believe is the GPU. The chip below it though, to the left of the Intel branded IC - is the one in question. It has some sort of core IC, surrounded by small SMT components on a board about the same size as the CPU. It can also be found by looking directly above the memory slots, and again of the two chips immediately there, it's the one to the left.

What is that, and how much heat does it generate?


Top
 Profile  
 
PostPosted: Tue Feb 21, 2012 3:04 pm 
Offline
Contributing Member
Contributing Member

Joined: Sat Oct 13, 2007 9:47 pm
Posts: 528
Location: Pullman, WA
That's the northbridge and it can. They are also designed to take a lot of heat (a lot like GPUs).

_________________
7mm SSD list
Guide to fixing T4x GPU problems via reflow

Current: T420s
Former: X301, X61t, T40


Top
 Profile  
 
PostPosted: Wed Feb 22, 2012 12:52 pm 
Offline

Joined: Wed Feb 01, 2012 12:53 pm
Posts: 38
Location: Minneapolis, MN
ah.

For some reason I thought most computers over the last few years didn't have a northbridge.


Top
 Profile  
 
PostPosted: Wed Feb 22, 2012 1:38 pm 
Offline

Joined: Sat Sep 17, 2011 4:13 pm
Posts: 32
Location: St.Petersburg, Russia
In case someone else is going to look for a thermal pad, I'd suggest using Fujipoly 6.0 W/mK.
Anything better than that is going to be ridiculously expensive.
Frozencpu.com carries that stuff - just pick the thinnest pad you can get away with.
The thicker the pad, the worse it works.


Top
 Profile  
 
PostPosted: Wed Feb 22, 2012 3:10 pm 
Offline

Joined: Wed Feb 01, 2012 12:53 pm
Posts: 38
Location: Minneapolis, MN
why is there a thermal pad there to begin with? Why not make the heatsink sit right on top of it so thermal grease can be used. Is it to contain the heat locally more than to cool the component? I didn't understand that aspect of the design.


Top
 Profile  
 
PostPosted: Thu Feb 23, 2012 2:18 am 
Offline
Contributing Member
Contributing Member

Joined: Sat Oct 13, 2007 9:47 pm
Posts: 528
Location: Pullman, WA
MartinBrice wrote:
ah.

For some reason I thought most computers over the last few years didn't have a northbridge.


Computers still and will pretty much always have northbridges. The next big thing is on die northbridges. I think AMD is shooting to be the first one to do it when they go to AM4, but we will see.

_________________
7mm SSD list
Guide to fixing T4x GPU problems via reflow

Current: T420s
Former: X301, X61t, T40


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 13 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group