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Laptop screen problems

  • 24-07-2013 6:15pm
    #1
    Pj!
    Closed Accounts Posts: 3,783 ✭✭✭


    The screen on my laptop has been playing up a lot recently in that it seems to lose connection. I'm getting lines and sometimes it just freezes.
    It can be solved by pressing along the bezel at the bottom of the screen. If I get lucky it will work without constant pressure on the bezel and will work fine until the screen is moved again.

    A loose connection? Faulty cable?

    The screen cable and connection lay behind the bezel where I press to get it working.
    I opened it up and the connection seemed to be very well taped in. I did nothing but give it a bit of a press but the problem remains.

    Laptop is a year old or so and the problem seems to have very gradually increased.


Comments

  • #2
    Reamer Fanny
    Closed Accounts Posts: 2,828 ✭✭✭Reamer Fanny


    Pj! wrote: »
    The screen on my laptop has been playing up a lot recently in that it seems to lose connection. I'm getting lines and sometimes it just freezes.
    It can be solved by pressing along the bezel at the bottom of the screen. If I get lucky it will work without constant pressure on the bezel and will work fine until the screen is moved again.

    A loose connection? Faulty cable?

    The screen cable and connection lay behind the bezel where I press to get it working.
    I opened it up and the connection seemed to be very well taped in. I did nothing but give it a bit of a press but the problem remains.

    Laptop is a year old or so and the problem seems to have very gradually increased.

    Sounds like a faulty video cable


  • #3
    johneire31
    Registered Users, Registered Users 2 Posts: 164 ✭✭johneire31


    I have seen this with damaged cable and also similarly with dodgy LCD, and I have also seen this with another condition that is very hard to get rid of, its called thermal creep. It happens in the connectors on the motherboard or on the invertor where you are pressing. It is caused by expansion of the connector terminals by the changes in heat as the computer is being used. as the connectors expand and subtract the contact is compromised and hence a bad connection. If you are pressing on the centre of the bezel at the bottom I would seriously doubt it has anything to do with the data cable for the screen as this cable most often is located by a hinge and rarely runs the length of the bottom of the screen. All that's in the center is the inverter board with a connection at each end, this is only powering the backlight, a fault here would only cause a dulled out screen.

    When you press firmly on the bezel you are also pressing on the screen edge which would suggest to me that the LCD panel is the problem, when you bend the screen a little it will get rid of the lines and also green speckles on the darker colours for a while. Sometimes also the data cable which runs up the back of the screen almost to the top can come loose and this too can cause this, and moving the screen will sometimes fix for a while this problem.

    j
    Galway Laptop Surgery


  • #4
    Pj!
    Closed Accounts Posts: 3,783 ✭✭✭Pj!


    Thanks guys.

    The cable 'arrives' to the screen from the bottom left hinge on the laptop and travels along the bottom and connects to the screen at the bottom centre. I unplugged it yesterday and then replugged it in case a connection here was the issue. The problem doesn't seem as bad now (but still there) but I have only used it for a limited period since.

    I'll see how it goes and will probably try replacing the cable should the problems continue.


  • #5
    johneire31
    Registered Users, Registered Users 2 Posts: 164 ✭✭johneire31


    You will have two cables dealing with the screen, one for powering the back light and one for sending data to the screen. You don't give make of laptop so hard to be exact. But in general, the back light cable will connect to a little circuit board right in the middle of the bottom of the LCD panel it will most often have a pink and white cable exiting this circuit to the screen, sometimes not visible.

    The data cable is coming from the same place, the motherboard connector, usually a thicker cable, this cable in almost most cases runs up the back of the LCD panel to almost the top of the panel and is connected into a slot. It would be fairly rare to see this cable being connected to a screen at the bottom of the screen as you suggest (unless its an LED panel). It may be worth your while to take out the lcd panel and inspect this connection.

    As your laptop is about a year old, you may well have a LED screen on it, which have a few different configurations than the standard LCD panels


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