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LCD Failures

Hardware failure – LCD, inverter, cable or backlight

Symptoms:

  • The laptop appears to start as usual but the screen is black, if you move it, it turns on and works properly. Failed cable.
  • The laptop appears to start as usual but the screen is very dark, although it changes colour a little and you can see a very feint image. Failed inverter or cable 90%/10%.
  • Immediately after starting the screen has dark pink/red tint and turns dark after a few seconds. Failed backlight.
  • The screen flickers a few times but then turns dark, if you move it or tap it lightly on the sides, it flickers again. Failed cable or LCD 50%/50%.
  • Screen is either black or white (no picture) and external monitor works. Failed cable or LCD 30%/70%.
  • There are stripes on the screen (either vertical or horizontal) that change when you move the screen or tap it lightly on the sides. Failed cable or LCD 10%/90%.

In all above cases, if you plug in an external monitor, everything shows fine on it (you have to plug it in before starting the laptop and may need to press the “Fn” key together with one of the “F1″ – “F10″ keys to make the laptop recognize the external monitor).

Troubleshooting:

If the screen is black, look for the “lid closed” switch and try pushing it a few times. It’s usually a small switch near the hinges that is pressed when the lid(the screen) is closed. Sometimes these switches get stuck in the “lid closed” position that results in black screen(no backlight) or non-starting laptop. Also some laptops have a magnetic switch (newer Dells, most Macs, etc.) that doesn’t get stuck.

The most common failures are (in this order): inverter, “lid closed” switch, cable, LCD, backlight.

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148 Comments

  • #148 by raymond January 29, 2012 at: 3:19 pm

    I want to plug a separte monitor on my laptop . every time i plug in the
    monitor both screens ar

  • #147 by shariful alam January 20, 2012 at: 11:48 am

    Dear Gentleman,
    Some days Ago when I was working my Lenovo Idea Pad U350 laptops that time I will downloaded from the lenovo server Bios Update file and next I will trying to install this file but in the mean time my laptop was hanged and several times i will trying to normally shutdown but it does not shutdown on normally?
    At that situation I was waiting for the some times regarding for normal shutdown? but nothing response and next time I will shutdown by forcing and again trying to start my laptop and next I will seen the problem in my laptop screen display does not working or nothing showing at display but laptop power is on position and cooling system fan was running on slowly ?

    Now at that moment i have needs to be your advising, which was component damaging /Replacing /Driver installing by removing this problem Kindly help me.

    Waiting for your response as soonest.

    Best Regards,

    Md. Shariful Alam (Pallab)
    Global Trade And Engineering.
    Dhaka, Bangladesh.

  • #146 by Cables January 11, 2012 at: 12:37 am

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  • #145 by Aijah January 3, 2012 at: 6:50 am

    My laptop monitor shows a white screen but the external display works fine. After researching, I’ve deduced that it has to be a problem with the cable. How do I fix that?

  • #144 by zahir December 19, 2011 at: 9:48 pm

    my laptop Compaq Presario CQ40 sometime it works properly but suddenly screen becoume freez ..slowly white/dark, but extarnal monitor work properly. what kind or problem it is? cable or LCD?

  • #143 by Annonymous December 15, 2011 at: 8:37 am

    with my laptop, whenever i move the screen or put the laptop down it flickers and then i have to re-adjust the screen by either tilting it back or forward in order to see the screen else it’ll all go putch black. Does anyone know what the cause of this may be? btw it a toshiba laptop

  • #142 by Logic November 30, 2011 at: 12:43 am

    My Laptop LCD screen shows Pink dots if LCD pannel changes angle. It works fine once you adjust the angle with Trail and Error.
    Is this Cable or LCD problem?

  • #141 by afis November 28, 2011 at: 12:23 am

    i was using my laptop yesterday i tuned it off and by the time try to turn it on back after 30minute all i see is blank screen but power button on and it makes a sound that it on d desktop. i have tried my best to fix it but no means. pls what can i do?

  • #140 by Christen November 14, 2011 at: 9:40 pm

    The mouse I’m using with my Toshiba Satellite has stopped working on the upper left quarter of my screen. Do you have any advise?

  • #139 by Arun November 14, 2011 at: 2:22 am

    Immediately after starting the screen has dark pink/red tint and turns dark after a few seconds. Failed backlight.Please anyone suggest me to fix this problem!..

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