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Black rectangular material on N5040 heatsink?

Hi, i disassembled an N5040 laptop, for LCD panel replacement, so i did an extensive deep cleansing for all the parts. when i removed the heatsink, i there was a black rectangle material of some sort, surrounding the edges of the thermal compound residue. when i cleaned it (with alcohol), the black material, which was slightly resembling a sticker, was removed also.. first of all, what is that black material? is it necessary? (or i can ignore it while reassembling). if so, how can i replace it? P.S Im not talking about the thermal compound, i know i must replace that..

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  • 13 Answers

The black material can be a insulation sticker though u don't have to worry a lot about it .... Ignore it

Posted on Apr 22, 2014


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SOURCE: Replacing lcd screen on HP dv4-1120us laptop

Here is one place I found thru google that sells your lcd for your laptop:

Price is about $89.00 before any S/H charges. I'm sure if you do some research you may find them cheaper.

When it comes to replacing the lcd on these laptops most of the time its done the same way. Unscrew the screws on the front lcd bezel and then remove the bezel so it will expose the lcd with a hinge on each side.

Remove the screws on the left hinge and also remove the screws on the right hinge.

At this point the screen will be loose. Disconnect the power connector from the bottom of the lcd that goes to the little rectangular inverter board.

There will also be a cable on the back of the lcd screen that needs to come out as well. Be gentle with the cable cause its sensitive.

At this point you can remove the bad lcd and then get ready to put the new lcd into place.

Go ahead and connect the lcd cable to the back of the lcd, don't worry it is slotted so it can only go in one way and it will kind of snap into place. Then go ahead and align the screen with the left and right hinges so you can put the screws back on so it keeps the screen in place.

Then go ahead and connect the power connector to the rectangular inverter as well. Now that you have the screen hooked up. Turn on the laptop and if you get video then you know the screen is good, turn the laptop back off and then go ahead and put the lcd front bezel back on and put the screws back into place and you should be good to go. I know this was lengthy but hope this information helps.

Posted on Jun 18, 2009

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Black material on back of N5040 CPU heatsink?

hi, these are thermal plastic sticker to make the thermal paste in tack and in place. as long as you know how to apply the thermal compound in the right way there's no need to replace it.

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Hello Rachel,
The memory of your laptop was dump. Open the back panel of your laptop using the screw driver open it.. then you will see the your memory card remove it and clean it with the eraser .. or if you have two memory card just take off the other one. and try to on. If the problem occur swap the other one. I'm sure it will work fine now..

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Dell laptop inspiron m5010 screen shows 3 images across - external shows the same

This = Not good

Graphics chipset problem.

A) Graphics chipset is overheating.

1) Suggest clean inside of laptop out,

2) Apply new Thermal Paste to CPU, (Processor), and also carefully peel off the Thermal Pad on graphics chipset, and throw away.

Suggest this time instead of using a Thermal Pad again, (Shudder), use a piece of copper sheet that is the correct thickness, and surface area.

Then use Thermal Paste on top if the graphics chipset, and top of copper sheet; before reinstalling Cooling Tube/Heatsink combo.

B) Graphics chipset has overheated, or actually has been overheating; and has now caused a poor contact of graphics chipset; TO motherboard.

Allow me to expand on A and B above.........

First of I think the graphics chipset is bad?
No sir, I do not.
Proof is that you ARE getting graphics on the LCD screen.
Three images, or not.
(Internal monitor of laptop, OR external monitor)

Referring back to A)

The CPU (Processor) and the graphics chipset, are the two hardware components that give off the MOST heat.

If the laptop is dirty inside, the cooling capacity of the cooling system; has dropped tremendously.

This allows the CPU, and the graphics chipset (GPU), to overheat.
Overheating graphics chipset will do all kinds of strange things.

What also transpires, is the Thermal Paste dries up.
Looses it's thermal conductivity properties.
A Thermal Pad is a material that is impregnated with Thermal Paste, so you can see how this equates.
It's impregnated Thermal Paste also dries up.

To regress;
The top of a Processor (CPU), and the bottom of the metal plate of the Cooling Tube, that sits on it; are not perfectly smooth.

A magnified view would detail, 'Ridges, Valleys, and Pitholes'.
When the two parts are mated together, Air Pockets are formed.
Air in this case is an Insulator. Not a Conductor.

Thermal Paste fills the above imperfections, and is an Excellent conductor of heat.

Moving on.........

A Thermal Pad is J-U-N-K!
Carefully peel off, and fly it at the cat. (NO, don't! lol!)

Using a small piece of copper sheet, that is the correct thickness; (And width/length), will allow more surface area for cooling. Becomes more passive surface area for cooling.

(The Fan Assembly does not blo-w air on the graphics chipset. More on that in a moment. Therefore it would not be Dynamic cooling. It is Passive cooling )

Let's take a look at the cooling system for the Dell Inspiron M5010, and I feel it will help explain better........

Scroll down to the three large photos.
The top, or first photo; shows a Top view.
The next photo down shows a Bottom view.
The photo below it shows a detailed view of the finned Heatsink.

Looking at the first photo, or can be said - Top View.....
The black Fan Assembly is at the top.

Note the rectangular area to the Right, of the black Fan Assembly.
This is the Heatsink.

Coming down from it is the curved copper Cooling Tube.
Note the small rectangular copper metal plate, then at the bottom of the Cooling Tube; note the V-shaped Aluminum metal plate.
(V-shape that goes to an odd shape)

Cooling Tube:
Sightly flattened copper tube, sealed on both ends; and filled with Nitrogen.

Has a small rectangular copper metal plate, that sits on the graphics chipset.
Also has an Aluminum metal plate (V-shaped), that sits on the CPU.

Small piece of aluminum strip, that has Tall, Thin, fins protruding from it, and is rectangular in shape.

Fan Assembly:
Small multi-bladed fan, in a D-shaped shroud.

Working principle:
Heat is absorbed from the Processor, and graphics chipset, by their two respective metal plates.
Then the Cooling Tube absorbs heat from the plates.

The Cooling Tube then transfers the heat to the finned Heatsink.
The Heatsink absorbs the heat, then radiates it away with it's tall, thin, fins.
Air flow from the Fan Assembly, helps carry heat away from the Heatsink's fins.

That small rectangular piece of copper plate, that sits on the graphics chipset; it TOO SMALL in surface area.
The surface area needs to be increased.

This would be accomplished by ADDING a small piece of copper sheet, that is larger in surface area; and is of the correct thickness.
(Approximately 1/16th of an Inch thick, or 2mm)

Using this video to help explain adding more surface area,

Posted for added surface area, NOT re-flowing graphics chipset, BGA surface mount.
Specifically go to -> 08:38

You can get a small piece of copper sheet, from a hobby store.
Thermal Paste is used on TOP of the graphics chipset, AND on top of the small copper piece of metal. Then the Cooling Tube is installed in place.

For additional questions on this procedure, or to have me clarify anything I have stated, please post in a Comment.

Moving on in an added Comment.


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ALL power removed. Remove the AC adapter (Charger), and Battery.

Use a $3 to $6 ESD wrist strap, with it's alligator clip attached to a good ground source; and disassemble the laptop for cleaning.

Also suggest removing the old Thermal Paste, and/or Thermal Pad; and replace after THOROUGHLY cleaning the area.
Thermal Paste could have dried up.
You're in there for cleaning, now is the time to replace.
Besides the stuff is cheap, and it is cheap insurance.

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In the above video stop it at 0:06, or so.
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The Fan Assembly has been removed. (The X shape sits on top of the Processor)

See the 'belt' of compressed dust on the Heatsink. Watch further as he removes it.

Blo-wing air through the Air Intake Duct, the bottom port; will just cram that stuff in deeper.
Blo-wing air in from the exhaust side will also.
SOMETIMES IT IS a temporary fix, but that is it ->


DO NOT use a vacuum cleaner either!
They create Static electricity.

(All you 'techs' that use a vacuum cleaner, go ahead, and post.
We will 'wax philosophical' on using a vacuum cleaner, on a computer )


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Hi everybody my name is Andrew and I have quite an unusual problem with my dell laptop. Before several days my girlfrend has unplugged the power supply while cleaning around but unfortunately I have had...

Hi Andrew,

Since you can view the display correctly on an external monitor, it completely rules out any problem with your video/graphics hardware. So, it's an LCD problem. The "Screen Inverter" can often be the culprit, and after that (considering your symptoms are color indicated and there is no flickering of the light from the LCD panel mentioned) it can really only be the LCD panel itself. Replacing a Screen Inverter isn't something you'd want to do unless you're willing to disassemble the display Assembly. Since you have to have the entire LCD panel out of its "frame" (Cover + Bezel) to replace a Screen Inverter, you might be best off to just replace the LCD and when you arder a new one, make sure it comes with a new inverter already attached (at the bottom of the panel). You'll be able to find the part on eBay.

For a real "laptop guy", if you'd want to have someone handle it for you, this replacement takes no more than 30 minutes, so don't let anybody try to take advantage of you on the price for the replacement.

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