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Black screen Laptop. Flickers once on start. External Monitor works

Hi Acer aspire 9410. Page flickered rapidly-Shut down pc. Black screen now. Tho near start up it will flash - only once. External monitor will work, tho only when the lcd on laptop cable is disconnected at start up. Plugging into MB after start up and screen on external monitor it remains black,. Now have screen apart. The backlight will flash once on start up. See flashing the Bios as a solution on some sites? Just talked to a tech and they said replacing the cathode is too finicky. Can get a used screen. Any hints on what to try before going either route? Oh and in display settings the laptop was not showing. Then showed. But unable to apply ' changes when checking extend to laptop. Do wonder if it is a possible programing issue? Thanks.

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  • Oliver Jan 15, 2013

    For first time it will do something on Fn key. But it is only to flicker (backlight). Realize it is likely the backlight. Just wonder why in Vista display advanced Laptop screen will not apply - either when i try to make it the main monitor or when trying to extend it to the laptop and keeping the external monitor as the default monitor?

  • Oliver Jan 15, 2013

    Thanks to all for the suggestions. Have yet to try changing the refresh. But will do. After hours spent - taking the darn thing apart. Flashing Bios. Uninstalling and reinstalling Graphics drivers etc can see the screen with a flashlight which previously was not happening - at least as far as i could tell. Nor before would the FN key and F# cause it to do anything - tho now it will flash but will not stay on. Will try the refresh setting- next. With screen apart - the cathode exposed - the light does flash a pinky hue? Sign of a bad cathode? Will let you know how it goes. Either today I purchase a new (used to me) Laptop screen. Or format and reinstall all O/S, see if that helps and likely end up needing the new screen anyhow:>)

  • Oliver Jan 15, 2013

    Should have added - Previously the only way an external monitor would work was to boot with only it connected. With both laptop screen plugged in on MB and external on the back it would only go to the laptop, Even tho in Bios setting was for two. The only way to get the external up was to unplug the laptop screen. So now both screens show plugged in on start. Can now apply changes to both in display settings. Before the laptop screen would not apply and save the changes. Thats the strange part to me - why i wonder if it could be drivers/software ... will fiddle around a bit more with it. Try the refresh suggestion - then likely admit defeat - and take the easy route and buy the used laptop screen. Thanks to all. I guess the brightside is - I now know more than I knew before about the insides of my laptop:>) If - I get it working by some miracle other than the new screen. Will let you know. Much appreciated to all who gave advice!

  • Oliver Jan 17, 2013

    SOLVED (not sure if this is going to dble post. Last attempt did not seem to go?) It was the CCF Lamp (cold cathode florescent). So of course you guys were right! Just replaced it with one from a broken lcd screen. No soldering required as it already had the tab. So pulled it and put it into my own LCD screen. Being a used light not sure what life left in it. May purchase a new one to have on hand for back up. So up and running. So Thanks again!



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Look for your computer's monitor settings, then adjust its refresh rate.
To modify a refresh rate on Windows, right-click anywhere on the Windows desktop.
Select "Properties," then choose the "Display Properties" tab on the window that appears.

Click the "Settings" option, then select "Advanced" from the window that appears.
Choose the "Monitor" tab, which lets you access a drop-down menu with the options for refresh settings adjustments. As a basic guide, use a setting of at least 75 hertz.

Confirm the change by clicking "Apply." Reboot the PC to ensure the new settings on the screen take effect.
Check your screen if the blinking problem is resolved. If not, try a higher refresh setting. If there is no change on the flickering of the screen, this means the problem is not caused by the screen's refresh rate. If your computer is not running on a battery or surge protector, shut it down to safely transfer the plug to another outlet Hope this helps.

Posted on Jan 15, 2013


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Posted on Jan 02, 2017

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SOURCE: Data Shows up only on External Monitor, not on Laptop Screen


Since the laptop works on the external monitor, then it would be safe to assume that it is only the L:CD display part that is the issue. Often LCD display (of laptops) are working but only that you can see the actual display. One way to verify is to shine a flashlight at an oblique angle to the screen, semblance or part of the desktop could be seen. If the desktop could be seen (albeit very very dark background) then it could either be the CCF Lamps (cold cathode florescent) or the inverter that powers the lamps.

Often, the defective component would be the inverter. It is relatively easy to replace the inverted. It is sometimes more difficult and challenging cracking open the casing of the display panel of the laptop than replacing the inverter. Additionally, inverters are readily available online. It is also not surprising that inverters for other brands/models would also be used in your Toshiba.

This would be a good place to start for inverter boards. This is a nice tutorial if you are considering a DIY.

In some worst case scenario, it could be the video interface or even a loose/open flat cable from the laptop's main body towards the LCD display panel.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on May 08, 2008

  • 63 Answers

SOURCE: Data Shows up only on External Monitor, not on Laptop Screen

If your system won't display anything w/o the external monitor. there's something wrong with the LCD's backlight. you may have to contact your laptop's manufacturer and check if this laptop is still under warranty. you may have to get the lcd replaced.


Posted on Aug 26, 2008

  • 32281 Answers

SOURCE: lcd screen black on laptop. External monitor works.

Defective CCFL backlight may has the following symptom:

  • Screen flashs on red/pink and off.
  • Picture stays on in red and slowly be come normal.
  • Picture flickering with dim display.
  • Picture flickering on and off.
All these symptoms indicate that the LCD backlight lamp (CCFL Lamp)
has reached the end of the life and all you need to do is replacing the CCFL lamp

Connect an external monitor to your laptop and power it up, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight.

Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out for parts, repair service and DIY info.

Posted on Mar 31, 2009

  • 2404 Answers

SOURCE: the screen on my laptop flickers colors and there

Lines on the screen means the LCD is bad and needs to be replaced. The inverter just makes sure the lcd turns on. That wouldn't cause lines on the screen.

Posted on Nov 28, 2009

  • 4924 Answers

SOURCE: Acer 9300: Replacement Mobo and Battery.

this is possible ..if nothing it is shown ..activate the external monitor by pressing fn+f4 ..This activates the external monitor in most laptops..and if the external one works ..that the issue is the screen and mostly the ribbon ..cause if it was the inverter back light it still shows shadows on it ...But first take a look again on the way ribbon is plugged and the back light cables..If you removed the mobo ..I assumed you also disconnected the display ...Also pay attention cause most laptops beeps when the ram memory is checked..on devices display ..and if you hear teh beep it probably work ...Also you may connect the hdd and try to boot to windows in blind and see if the windows log-in sound is heard ..This way you will now for sure it is the screen connection

Posted on Jan 26, 2011

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if you have screen Flicker, this could be several Things. Faulty or Failing Inverter Board, Or tft screen tube failing ( usually determined by occasional Pink Screen At Startup ) try to use an external Monitor. if it,s fine on an external. this will eliminate motherboard or graphics chip fault.

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