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Diagnose flickering screen problem

  • 20-01-2010 12:14am
    #1
    Noviceman
    Closed Accounts Posts: 176 ✭✭


    Hi,

    I'm looking for some help diagnosing a flickering screen problem I have with a Sony Vaio laptop. So, it's started happening recently when I turn it on, it flickers as it turns on, then eventually goes all black. Sometimes if I close the screen down it comes back on again for a few seconds. When I re-boot again it always has the same behaviour, flickers and then eventually goes black at some stage, not always at the same stage, sometimes I might get to log on, sometimes not. I've connected to an external monitor and everything works fine.

    For me, it's not an inverter issue because I've seen inverter issues before and it was very consistent behaviour, the screen just blacks out consistently and you can see the screen with a torch, in this case, I can't really see screen with or it's very difficult to. If it is ccfl issue, I would've thought that bulb would be gone and that's it, it would just never light up....

    One more thing that would indicate ccfl issue to me is if I turn it on and have the screen dimmed to it's lowest it works fine and stays on until I start to brighten it up again and then just goes black.

    Any experts out there can diagnose this for me, I'm not sure if it is ccfl issue, and I don't want to go messing with it, I tried to replace a bulb once before and it was a disaster, not an easy process for a half amateur compared to replacing an inverter.


Comments

  • #2
    Overheal
    Registered Users, Registered Users 2 Posts: 86,729 ✭✭✭✭Overheal


    I dunno, but I must apologizze im going to pick your brain - my screen sometimes lights off but i can knock it back on - thats an inverter issue right? Because if I dont fix this soon Im going to punch a hole in it (trying to fix it) :pac:


  • #3
    AlmightyCushion
    Moderators, Education Moderators, Technology & Internet Moderators Posts: 35,137 Mod ✭✭✭✭AlmightyCushion


    It's not the ccfl as that is your backlight. If that was knocking off you'd still be able to see it but it would be very faint. It could be a loose/damaged connection between the graphics output and the display.

    @Overheal - If it's going very dim, then it's an inverter or backlight issue.


  • #4
    Overheal
    Registered Users, Registered Users 2 Posts: 86,729 ✭✭✭✭Overheal


    It must be the inverter: now im noticing a very subtle 'dimming' its doing, like its pulsing slowly and randomly between 100% and 90% brightness. Thats when its not shutting off completely... time to bite the inverter bullet


  • #5
    Noviceman
    Closed Accounts Posts: 176 ✭✭Noviceman


    AlmightyCushion wrote: »
    It's not the ccfl as that is your backlight. If that was knocking off you'd still be able to see it but it would be very faint. It could be a loose/damaged connection between the graphics output and the display.

    .

    I was thinking myself it was a connection issue, so if it's a loose connection, should be easy to fix, but if it's damaged, that sounds very difficult, first i have to figure where and what connection, then replace it, sounds messy.

    where is the connection between graphics output and display, is that near where all the connections are around the inverter or will i have to root out where graphics card is, on motherboard someplace i presume


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