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Replacement LCD Screen Brightness Problem

Last response: in Laptops & Notebooks
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October 3, 2012 4:48:55 PM

Hello, a few months ago I replaced the LCD screen on my Lenovo ideapad u460 and the new screen works fine, however I am only able to set the backlight brightness to two different settings. After a fresh install of Windows 7 on a new hdd I still have this problem. I'm not sure if there is something wring with the OEM screen or if it has something to do with Windows. One important thing to note is that while the laptop is booting up I am able to adjust the brightness using the Fn Up combination and sure enough it goes through the normal brightness levels, but as soon as Windows boots up I am stuck with only the two settings again. I haven't been able to find much information on this problem and if anyone may have any idea as to what might be causing it or how to fix it, I would really appreciate it. Thanks!
a b D Laptop
October 3, 2012 5:24:28 PM

you could try installing drivers from the manufacturer's webside
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October 3, 2012 5:34:14 PM

Hi

Have you tried changing the brightness using Nvidia's control panel ( I think your laptop has Nvidia)? or by using the Power Settings in the Control Panel? Just a couple of quick ideas...

Fungi
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October 3, 2012 6:01:52 PM

I changed the video chipset on my Alienware and noticed that the Windows 7 brightness settings no longer worked.

the settings inside the Nvidia driver did work, like the guy above me posted, but the 'brightness' quality does seem the same.

Could be because the screen isn't correctly recognized by the motherboard BIOS or power control settings (like the ones for sleep or power savings mode) and since it doesn't its still using the settings its at before the swap (which is what happened to me)

Dry
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October 3, 2012 8:48:01 PM

Thanks for the replies, but as far as the nvidia settings goes I actually don't have a graphics card and am using the integrated graphics with the Intel graphics drivers but just as the nvidia settings, Intel's settings also let me adjust the display settings including the brightness of the LCD but not the backlight brightness. As I am concerned with adjusting the backlight brightness this doesn't help much . As far as drivers go I installed all of the necessary drivers from Lenovo's website after I re-installed Windows. Concerning the power settings in the control panel, I am only able to adjust the slider to the two settings. This is obviously no big deal but it is annoying not being able to lower the brightness as much as I used to be able to and it drains the battery a lot quicker, but anyways thank you all for your suggestions.
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October 3, 2012 11:31:44 PM

Okay so I was able to fix the problem, and in a very odd way. I swapped out the working LCD panel with my old broken one and booted up the computer, sure enough I was still able to control the backlight brightness properly, although there was no image I was still able to see the brightness changing. So while the laptop was still powered on, I swapped the working LCD back in and now the brightness control is working properly :D .

If anyone is having a similar issue after replacing your LCD screen and you happen to still have the broken LCD panel, give this method a shot and remember to keep the laptop running when putting the working screen back in, just be careful. Hope this helps!
*EDIT* Do not attempt this fix with the laptop running as it is potentially very dangerous, instead swap LCD's only after disconnecting all power sources including battery(Thanks Brett928S2 for advice).


Thanks again for all the suggestions, I appreciate it.
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October 3, 2012 11:32:52 PM

Best answer selected by twinpanic3.
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a c 248 D Laptop
October 4, 2012 12:48:52 AM

twinpanic3 said:
Okay so I was able to fix the problem, and in a very odd way. I swapped out the working LCD panel with my old broken one and booted up the computer, sure enough I was still able to control the backlight brightness properly, although there was no image I was still able to see the brightness changing. So while the laptop was still powered on, I swapped the working LCD back in and now the brightness control is working properly :D .

If anyone is having a similar issue after replacing your LCD screen and you happen to still have the broken LCD panel, give this method a shot and remember to keep the laptop running when putting the working screen back in, just be careful. Hope this helps!

Thanks again for all the suggestions, I appreciate it.



Hi :) 

I own a laptop repair company....

Sorry but that VERY bad advice.... we change hundreds of screens a year...WITH NO POWER CONNECTED, because its a VERY good way to either blow the new screen or the graphics chip or card....

All the best Brett :) 
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