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Solved Laptop Screen shuts off but computer is still running

June 26, 2012 at 15:50:33
Specs: Windows 7, AMD Phenomâ„¢ II Dual-Core Mobile Processor N640/ 4GB DDR3 1066MHz

I have a Toshiba Satellite L675D-S7052 and as I turn my laptop on it works fine for about 5-10 minutes however after that time frame my screen goes black. Everything is still running perfectly as I hear nothing that's out of the norm however like I said my screen goes black and noticed that the "caps lock" key doesn't light up either.

I have drained all excess charge from my laptop and that did not work. I hooked up my laptop to an external monitor and it works fine up until my laptop gets the black screen then my external monitor goes blank as well. So, I'm drawing a blank at what else it could be.

If anyone reading this can guide me in the right direction I'd appreciate it.

See More: Laptop Screen shuts off but computer is still running

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✔ Best Answer
June 27, 2012 at 19:54:03

Then there is probably nothing wrong with your graphics. Could be heat related.

Install HWmonitor from the link below and run it in the tray by the clock. Watch the temperatures and fan activity to figure out what is going on.

http://www.cpuid.com/softwares/hwmo...

Have you tried blowing out the vents?

Do you ever hear the fan run?



#1
June 26, 2012 at 16:49:39

Check your power saving options in Control Panel> Power options.

What is happening is normal, but is changable in the above settings.


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#2
June 26, 2012 at 17:16:15

Thank you for responding.

I have checked my power options and made one change because I am given a choice between two setting and did noticed it stayed on a bit longer but in the end still gave me a black screen. Maybe I have to do some more configurations? In that case I wouldn't know what to change.


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#3
June 26, 2012 at 21:05:58

Laptops are meant to go to suspend or even hibernate modes when not in use to preserve battery life.

Some laptops have two modes. One for battery and one for AC power.

I suggest you read your manual to determine what settings will work for you.


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Related Solutions

#4
June 26, 2012 at 23:45:06

I think I may have found a solution.

I've turned the laptop on with the battery connected and also without it connected and both times have operated for 10+ minutes. But here's the thing, both times I had the laptop standing in a vertical position to let the air flow and so the laptop will be cool. However, when I put the laptop down in it's normal horizontal position the screen shuts off withing a few seconds but the computer still running.

So, my question is this. Could all of this be heat related? I don't have a laptop fan to rest it on but from what I've been testing it seems that heat is most likely the cause.


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#5
June 27, 2012 at 06:04:51

Yes, it could be heat related. I got the impression this was a new laptop. If older, the air vents could be crapped up.

Try blowing out the vents with canned air. DO NOT use a vacuum cleaner.


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#6
June 27, 2012 at 14:39:52

This laptop is nearing 2 years.

I'm still having the same problem. Is it possible that it could be the connections to the display given that the screen does light up and I can see my desktop and surf the web a bit before the screen goes blank (note: I see no flickering when it is blank either).


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#7
June 27, 2012 at 18:20:55

Try connecting an external monitor.

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#8
June 27, 2012 at 18:34:25

I've tried that already and when it's connected to an external monitor it works as long as the laptop monitor works but when my laptop monitor goes blank. So does my external monitor.


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#9
June 27, 2012 at 19:54:03
✔ Best Answer

Then there is probably nothing wrong with your graphics. Could be heat related.

Install HWmonitor from the link below and run it in the tray by the clock. Watch the temperatures and fan activity to figure out what is going on.

http://www.cpuid.com/softwares/hwmo...

Have you tried blowing out the vents?

Do you ever hear the fan run?


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#10
June 28, 2012 at 16:52:40

I installed HWMonitor and it all seems to be fine, the temperature isn't bad (imo) the lowest temp I recorded was 54 degrees (Cel) and the highest was 69 degrees (Cel). I couldn't record the fan activity because for some reason it wouldn't show and I couldn't figure out how to bring up that activity.

I did bow out the vents with canned air.

And yes, I do hear the fan run. It's strange because I noticed when my laptop starts up the fan is quiet as a new laptop should sound but progressively the fan sounds a tad louder as i'm browsing with multiple tabs or using different programs (at the same time) then ultimately my screen shuts off.


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#11
June 28, 2012 at 18:45:39

Monitor the temperatures in real time by having HWMonitor display in the tray next to the clock. See what the temperature is when the screen goes dark.

Laptop processors are set up to run at variable speeds depending on the demand. So if you are hitting 69C the processor is probably slowing down to maintain that temperature.

You may need to partially dismantle the case to clean things better.

Get you see a lot of dust come out when you blew it out?

Your temperatures are kind of high. My desktop CPU is currently running 31C. That is about 10 degrees F. hotter than the room temperature.


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#12
June 28, 2012 at 19:32:39

Yeah, I did see a lot of dust come out after I blew it out and after I cleaned it out I got this warning on my screen "Warning: A problem with the cooling system has been detected. Please turn off the computer immediately, and return it for service." I'm worried what that could lead to. I noticed that after I blew out some of the dust from the laptop there were a couple balls of dust in the fan area. So, is that what the message is referring to?

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#13
June 29, 2012 at 00:17:42

Either your fan is bound up by dust bunnies or you dislodged the heat sink. If you don't have the skill set to open the case then you need to take it in for service. Write down that message and tell it to the tech.

If you want, you could try blowing out some more.

Did you blow out while under power?


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#14
June 29, 2012 at 09:52:05

I opened up my computer and did find that there was a bunch of dust around the fan so I cleaned up all that build-up.

Here's an update. After I opened my computer and cleaned it all up, the screen is on longer than what it has been since this problem began. I'm looking at my Toshiba PC Health Monitor and everything there seems to be just as it was before all this happened. And laptop temperatures dropped considerably.


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#15
June 29, 2012 at 11:25:06

If the monitor is still going black, you may have the power settings set to turn off the display after a set time span. To view those settings go to:

Start> Control panel> Power options.


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#16
June 29, 2012 at 15:02:13

I think cleaning all that dust out solved the problem. It's been working fine ever since I cleaned it out.

Thanks for the help.


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#17
June 29, 2012 at 17:42:59

Glad to help.

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