Dell XPS L7 L702X :: Screen Flicker / Bright Flash

May 1, 2013

What is happening with the laptop, sometimes I noticed my laptop screen will flicker(or a bright flash as if someone was taking a picture). When I go to the event viewer it tells me Desktop windows service manager has been disabled by the windows system assessment tool. I'I have the nvidia graphics card + Intel(using optimus technology),running windows 7 professional 64 bit.

I forgot to mention when playing videos I think the graphic card makes a strange noise like there isn't enough power or something (Not 100% sure)

I have nvidia gt555 with intel Optimus 
Intel 2670m
8GB of RAM
Windows 7 professional

I tried to do a fresh install of windows 7 but the problem still persists and I cannot test it since I have deleted the recovery Drive. How do I test if the graphics card is working properly 

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Feb 1, 2010

Does your screen flicker on AC:
Does your screen flicker on Battery:
Laptop Model:
BIOS version:
Screen type:
Screen refresh rate:
Power supply model:
Local power service; 50hz/60hz, 120v/220v:
Brightness levels that make it more visible:

Quote:

Originally Posted by fluffyuk

I think we need to set a whole new thread for the RGB screen issue, this thread is getting overrun.

You are correct. Here is that thread.

At this point we are looking for common factors. Post up any other useful information you can think of.

Does anyone know the Hz of the backlights?

Does this flicker still happen on an external monitor?

Human vision factors:
Most people can see flicker at about 80 hz. This is most noticeable in bright light and in the peripheral vision areas. Most people adjust to the flicker rate of their local power so that they no longer notice the flicker.

Most people can see an animation as continuous movement at about 20 Hz. The brain tends to understand that it is seeing an animation and assembles it as movement. On things that are not moving, the flicker is more noticeable as your brain has nothing it can assemble the flicker into.

Some people have said that they can see the flicker while other people around them can't. This could be because some people are less sensitive to noticing flicker. This could also be because the other person is looking at the screen from farther away (say, over the shoulder of the owner) and the screen is centered in their vision, not in the peripheral vision areas. If you are one of these people please let us know it your test persons have actually sat directly in front of the laptop, just like you normally would be when you see the flicker.

I suspect the flicker is actually due to the Hz of the backlights, not the actual refresh rate of the screen.

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Pictures: [URL] .....

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Problem Description:
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Repair Description:
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Diagnosis/Repair Details:
fitted new ODD and middle cover

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OPU Test - not supported
Spindle Test  - not supported
Tray Out Test - not supported

My machines details:

Model Dell System XPS L702X
Operating System Microsoft Windows 7 Home Premium Edition (64-bit)

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[URL] ....

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