Fujitsu AMILO L7300 laptop - white display

Posted on 2007-10-11
Last Modified: 2013-11-17
I have a Fujitsu Siemens AMILO L7300 laptop which was originally given me to fix because the power connector socket on the motherboard was non-functional. I replaced that and then discovered the power adapter is also non-functional. I've powered the laptop with a replacement adapter, but the screen displays white with an occasional faint yellow-brown line of colour. If Ilook really hard I can just make out the windows desktop when it finishes booting. I've attached an external disply which displays fine. I've opened the case and 'jiggled' the video signal and video power cables, but it doesn't alter the LCD display at all.
What is the likely source of the fault. As far as I know it hasn't been dropped, and the LCD panel is physically intact. So I'm suspecting some sort of power problem could have affected the display.
Any clues? How to diagnose?
Question by:ComputerFundi
    LVL 32

    Expert Comment

    A white display usually means there is no video signal getting to the LCD. The white comes from the CCFL bulbs lighting up the display, but the lcd isn't active.
    The video cable, or the LCD panel may be the issue as you are getting a signal to an external monitor proving the video system on the motherboard is working. The video cables can be quite sensitive to breakage even when none is apparent, just from opening and closing the laptop lid over time.
    First replacement would be the video cable, then the LCD would be next.

    Author Comment

    sparkmaker - do you know a good source of such cables?
    LVL 32

    Accepted Solution

    Searching for such a cable can be quite an adventure. The best method I have found is to use the product numbers that are on the cable itself or the LCD product number which is usually on the backside of the LCD. The identification of the LCD is the key, as the cable is particular to it, and cannot be replaced with another LCD models cable.
    This model seems to be a European one and most of the North American sites I check do not have any reference to it. That doesn't mean it can't be found here, just need to know what model of LCD is in there in order to cross reference it..

    Author Comment

    Hi Sparkmaker
    Thanks for your suggestions. The owner of the laptop has taken it back, not requiring any further diagnosis. You can have the points anyway - it's useful information for me for future repairs.

    LVL 32

    Expert Comment


    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone.

    Featured Post

    Highfive Gives IT Their Time Back

    Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

    Suggested Solutions

    A better way to set an LCD's resolution to make the screen bigger. For older people or those people with vision problems, a very common way to increase the screen size both with old CRT's( does anyone even still use these?) and newer LCD's is to …
    As hardware bugs go, this is a strange one! I upgraded a laptop in December 2011 with a 512GB Crucial m4 2.5-inch/9.5mm SATA Solid State Drive (SSD), Crucial part number CT512M4SSD2: …
    To add imagery to an HTML email signature, you have two options available to you. You can either add a logo/image by embedding it directly into the signature or hosting it externally and linking to it. The vast majority of email clients display l…
    This video discusses moving either the default database or any database to a new volume.

    761 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    8 Experts available now in Live!

    Get 1:1 Help Now