Dell Xps 15 Laptop Computer (Intel Core i7 740QM 640GB8GB) (dndogx41) PC Notebook Logo

Question about Dell Xps 15 Laptop Computer (Intel Core i7 740QM 640GB8GB) (dndogx41) PC Notebook

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Continuous beep/crackled audio

My Dell XPS 15 L502x has been emitting a loud and continuous beep noise since last Friday. The sound is also horribly crackled and distorted.

Posted by Anonymous on


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  • Dell Master
  • 5,660 Answers

Beep noise you hear is a BIOS Beep Code

The computer's way of letting you know something is wrong, and an area to look into for it.

Loud and continuous beep, usually indicates a problem with the Processor (CPU).
To be more specific the Processor is overheating.

More specific than that, it is caused by the laptop is dirty inside.

Air is used to cool the hardware components inside the laptop, with the cooling system.
The two hardware components that give off the most heat, is the CPU (Processor), and graphics chipset. (GPU)

The cooling system consists of;
1) Fan Assembly
2) Cooling Tube
3) Heatsink

Click on the image to enlarge.
The aluminum die-cast metal plate you see to the far right, sits on the Processor. (CPU)
The small metal plate is connected to a Cooling Tube.

The small aluminum metal plate to it's left, sits on the graphics chipset. (GPU)
As you can see it also is connected to a Cooling Tube.

Both Cooling Tubes end in a black rectangular finned, Heatsink.
What is not seen of the cooling system, is the Fan Assembly,

The flat part of the D-shaped shroud, of the Fan Assembly; rests up against the finned rectangular Heatsink.

A) The Cooling Tubes are a slightly flattened copper tube, sealed on both ends, and filled with Nitrogen.

B) The Cooling Tubes end in a finned Heatsink. A thin small strip of metal, that has tall thin fins protruding from it.

C) The Fan Assembly consists of a small multi-bladed fan, encased in a D-shaped shroud.
The fan draws air up from the Center, (Bottom of laptop), and exhausts the air through the fins of the Heatsink. (Then out the side of the laptop)

Heat from the Processor, and graphics chipset, is absorbed by their small respective metal plates, that sit on them.
The Cooling Tubes then absorb the heat from the small metal plates.
The Cooling Tubes transfer the heat up to the finned Heatsink.

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

When the fan blades, center hub, and surrounding cage, (Shroud), get dirty; the cooling capacity drops tremendously.
Just a light coat is all it takes.

When the fins of the Heatsink are clogged with 'Gunk', the cooling capacity drops tremendously.
Gunk = Dirt, dust, lint, hair, food crumbs, name it.

Also in-between the small metal plate on the Cooling Tube, and the Processor; is Thermal Paste.

The top of the Processor, and the bottom of that small metal plate on the Cooling Tube; are not perfectly smooth.
A magnified view would detail, 'Ridges, Valleys, and Pitholes'.
When the two parts are mated together, there are air pockets formed.

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

In-between the graphics chipset (GPU), and it's respective small metal plate, a small piece of Thermal Pad is used.
A Thermal Pad is a material that is impregnated with Thermal Paste.

After time (Age), and also due to overheating; the Thermal Paste can dry up.
Looses it's thermal conductivity properties.
Same goes for a Thermal Pad, as it's Thermal Paste dries up.

After cleaning it is suggested to replace the Thermal Paste PROPERLY, and replace the Thermal Pad.

A Thermal Pad CANNOT be reused.
Do NOT care if it looks like new.
Once the impression is made into it, from the small metal plate, it's DONE. Small metal plate will not contact, the Thermal Pad's surface correctly again. REPLACE.

Suggest use a can of compressed air for computers, Tweezers, and a small soft brush. (Makeup brush?)
This is an example of what a dirty laptop looks like inside.
Using the Dell XPS M1710 for an example,

This is Dell Support > XPS 15 (L502X) Notebook PC > Main Support page,

Click on the Manuals & Documentation tab.
(Product Support / System Configuration / Drivers & Downloads / Parts & Upgrades / Manuals & Documentation / etc )

Click on the blue - Service Manual (1451KB)

The Zoom In icon ( + ) at the top, increases the view size; when you click on it..
The Zoom Out icon ( - ) decreases the view size.

Click on - Heatsink - in the right column.

HMMM, never mind!
Seems this particular PDF file is messed up. Or it's on my end. You may have better luck.
Instead scroll the page down until you come to - System Board,

The Adobe Reader page number box is at the Top, to the right of the Down Arrow.
1) Put your mouse cursor in the page number box, left-click once.
(Everything in page number box is now highlighted in blue)
Now Backspace any numbers out.

2) Type the page number you want.
3) Press the Enter key.

Go to Page 45


When you get to Step 27, you can access the cooling system, to remove it. (Replace Thermal Paste/Thermal Pad)


Posted on May 21, 2013


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SOURCE: Dell Xps 15 Laptop Battery Not Charging

If your battery will not charge, you need to run a test on some components on the laptop. The battery, the charger and the laptop itself. Once you detect the faulty conponent then you replace it with a new one.

To test the battery:
1.Power off the laptop,
2.Take out the battery,
3.Insert it in another laptop,
4.Check of it will charge,

If the battery holds a charge there, then it means the problem is not from the battery, but if it does not hold a charge, then it means the battery is defective and need to be replaced with a new one.

To test the charger:
1.Unplug the charger from the present laptop,
2.Connect it to another laptop to see if it will charge.

If it charges the laptop, then it means the charger is alright, and if it does not charge the laptop, then it means the charger is bad and need to be replaced.

To test the laptop:
1.Turn off the laptop,
2.Disconnect your present charger,
3.Remove your present battery pack,
4.Insert a well tested battery into the laptop,
5.Connect a well tested charger to the laptop.

If it powers on, then it and charges, then it means the laptop is working fine, but if it does not charge, then it means the connection port of the laptop is bad.Hope this information was helpful.

Dell XPS 15 AC Adapter Charger

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