Solved Laptop Screen Light Off, but screen is still on

March 11, 2016 at 03:04:19
Specs: Windows 7
I Have Dell Inspiron n5010.

It was happened for the second time, earlier it was happened but i left it for one night and agian it was back to normal. But this time it won't switched on. Is it a loose connection issue or any screen related??

I am seriously confused, i need suggestions plz help me guys.


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#1
March 11, 2016 at 04:55:59
Can you explain the situation a little more clearly...

Are you saying that the laptop is apparently "off" but there is display visible on the screen?

And are you also saying that you cannot power up the laptop at present; it won't boot up etc.?


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#2
March 11, 2016 at 05:02:06
Hi,

I mean to say...whenever I am switching on the laptop, its getting on but there is no power/light source in the screen, However, all the startup things like windows welcome page, login window are visible so and so lightly which can be seen by placing a torch/flash light in front of laptop screen.

For a second it seems like there is no brightness in the screen, but actually there is no light source in the screen.

message edited by snist


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#3
March 11, 2016 at 05:44:12
✔ Best Answer
It appears that the screen may have a backlight problem.

Just to verify this may be the issue have you tried going into the BIOS just to check if the screen comes on at full brightness?

There are are few reasons why you might get a backlight failure.

The first could be a stuck or faulty lid switch. The lid switch turns off the screens backlight when the lid is closed to preserve power. A few gentle taps around the hinged area of the lid can make the screen light up then go dull again. Although doing this won't necessarily diagnose the problem being the switch it will let you know if the backlight itself is working to some capacity.

Next is the backlight inverter. This problem is more involved in diagnosing as inverter board itself could be faulty or even the power supply to the board could be the problem.

The last part that would need to be checked is the backlight lamp itself.

As you can see if the BIOS screen isn't fully lit then there is a bit of troubleshooting involved.

Here is a tutorial on diagnosing backlight problems:

http://www.laptoprepair101.com/trou...


message edited by btk1w1


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#4
March 11, 2016 at 05:50:22
Thank You.....I ll get back to you once i will done with all the steps u have mentioned.

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#5
March 11, 2016 at 08:35:03
Presuming it does boot up - but no display on the actual built-in screen - for reasons suggested by "btk1w1" - have you an external monitor which you can connect to the laptop?

There is an F key function which will allow you to route the video out to an external display - only; or to both internal and external; and of course back to internal display. The appropriate Function key will have a symbol representing the external display and this is the key you press whilst holding the F key down at the same time.

See if you can get a signal on an external display at least? Also see if you can cycle through to that and then also back to the internal display + internal, and then only internal? It is "just possible" that you have the F display option set to external only; although (and it's been a while since I used to set that option for users on a tv studio set) I seem to recall that a power cycle (switch off/on) usually cancels any F setting re' display options.


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#6
March 13, 2016 at 23:13:43
Hi,

I have attached an external monitor and it works fine. But whenevr i am unplugging the same it backs to the original state, i.e., the problem which i have mentioned earlier. For your information i have opened the screen of the laptop and at that time it started to come to its original condition. For some period it was back to original stage and again then it stated to blink the brightness of the screen.

So what i think is, it have some minor loose connection issue, but i am unable to fix the same.


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#7
March 18, 2016 at 05:20:59
If you're OK ate the prospect of opening up the cases - you may find that the ribbon connector between the built-in display (in the lid) and the motherboard is no-longer secure connected. It may have become slightly detached at one end or t'other... Equally - it "may" be that the ribbon cable itself is fault; and these can be replaced (usually).

Can you check with Dell-land re' a proper replacement ribbon; and also even google for one? Also do you have the full (maintenance) manual for the Dell? You would find that invaluable.


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