..::Fixing Common Laptop Problems::..

    ..::Fixing Common Laptop Problems::.. Super_10

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    Post by mehedi on Sun 07 Nov 2010, 6:33 pm

    Liquid Spills on Laptop

    I have repaired many Laptops exposed to accidental liquid spills. Thisis a recoverable condition in most cases. It is most important torespond to the cleaning up process as soon as possible (beforecorrosion or internal soakage occur)! Liquid intrusion can cause thefollowing types of laptop damage:

    - Short circuit due to conductive nature of wet liquid (problem may clear as liquid dries)
    - Short circuit due to dried liquid residue
    - Corrosion occurs (particularly volatile with some acidic soft drinks - Coke)
    - Electronic components damaged by above short circuits

    Immediately when a spill occurs, turn off the laptop, invert the laptopand leave the unit upside down (drainage) for at least 20-30 minutes.Then, remove any attached leads, remove the power unit and battery, andallow the unit to air-dry overnight.

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    To remove any liquid residual: Have someone remove the keyboardassembly and perform additional cleaning. It may help to use cottonbuds and distilled water to remove any contamination. Where corrosiveside effects may be suspected (with coke), gently rub any suspect areaswith a cotton bud dampened with CRC or WD-40. Dry the treated areas sothat only a light film of the WD-40 anti-corrosive solution remains.While the keyboard is removed, use a bright light and magnifying lensto inspect areas where the liquid made contact.

    Laptop randomly turns off

    This is often due to:

    - AC power adaptor sensing an overload of power drain
    - Overheating processor due to a build of internal dust (clogged fan)
    - AC power adaptor not able to sustain normal power needs (faulty power adaptor)
    - Battery overheating, due to internal battery fault, or charging levels
    - Intermittent short circuit or open connection (check condition of power leads)

    On older Laptops, the most common reason is poor cooling. Try goingsomewhere air-conditioned and see if that helps. Inspect the areas nearthe internal cooling fan; see if there is a build up of dust fibres.Easy way to check this; with the unit running, feel the flow of airfrom the cooling outlet(s) - is the airflow very low? If yes, and theunit is at normal operation temperature, this may indicate the internalcooling system is partially clogged.

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    Troubleshoot Laptop LCD Video Display problems

    Here are some tips and tricks for troubleshooting and fixing laptopvideo problems. Video issues are very common within portable computersand with the following tips you should be able to detect and eliminatebasic laptop video problems.

    Laptop LCD screen has a faint image or is very dark

    Look closely at the laptops LCD screen, and see if you can see a veryfaint image. If you can then it is possible that the Laptop's LCD lidclose switch is stuck in the closed position. In this mode thebacklight stays off, even with the LCD lid open. This is to conservepower when the laptop is ON with the LID closed. Check the LCD lidclose switch. It is a small plastic pin located close to the back LCDhinges. Try tapping the lid switch a few times to see if you can turnon the screen backlight. If that does not help, then I would suggest toreplace the FL inverter board.

    Laptop LCD screen is solid white colour or garbled

    Connect an external computer monitor to the laptop. If the externalmonitor display is fine, then you have a problem with the Laptop LCDscreen or the LCD cable connection. If the external monitor image isthe same as on the Laptop LCD, then it is likely to be a faultyintegrated onboard video, this means replacing the motherboard of theLaptop.

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    A typical Laptop LCD display assembly

    The above simplified block diagram illustrates the basic components that are involved on a Laptop LCD video display problem.

    Connector Locations 1 - 2 - 3: Video data is sent from themotherboard through to the LCD screen at connector 2. The video cablealso feeds voltage to the FL inverter board at connector 3.

    FL inverter PCB Locations 3 -4: This section converts the lowvoltage DC source (connector 3) to high voltage AC (connector 4), asrequired to energise the backlight bulb. If the FL inverter PCB isfaulty, the LCD screen will appear as a very dim image on the Laptopdisplay screen.

    CCFL (backlight bulb): When the backlight bulb is working, youcan see the image on the LCD screen. With some Laptops, the backlightbulb is a part of the LCD screen assembly and needs to be replaced witha complete LCD screen assembly. It requires a specialized Laptop repairworkshop to replace the backlight bulb.

    Laptop Lid close switch: This switch is a small switch(mechanical or magnetic) that is located close to the rear displayhinges. Most laptops will either hibernate or operate in standby modewhen the LCD is closed. This is achieved by interfacing with theLaptop's BIOS power management software. In turn this is linked to theWindows operating system.

    Laptop is slow and continually shows Internet popup's

    The Laptop is very likely infected with spyware. Spyware issoftware that hides on your computer and attempts to collectinformation about your activity on the internet. Spyware is sometimestransferred to your computer when you download 'unknown' free softwareor when you link to free music Internet programs (KaZaA, Limewire,BearShare, etc). The best method to remove and further prevent spywareis to use Spybot.

    Laptop is frozen, no response to keyboard or mouse, cannot Shutdown

    With most Laptops I have seen that this will happen from time to time! The easy method to solve this problem is:

    - Disconnect the laptop power cord
    - Remove the battery from the laptop
    - Wait a short while (10 seconds)
    - Replace the Laptop battery into the unit
    - Reconnect the Laptop Power cord
    - Turn the Laptop on

    The Laptop will start normally and be fully operational. If you wereworking on a Microsoft Word or Excel document at the time of theproblem, then you may find that the data has been auto-recovered foryou. In this case, you will be automatically prompted to view the lastdocument you worked on when you open the Microsoft program.

    Troubleshoot Laptop Hibernate and Standby problems

    Power management options on laptops sometimes to cause problems.Hibernate and Standby modes are power saving modes of operations tobattery powered laptops.

    Hibernation is a procedure by which the working state (contents) ofyour work is stored to disk before the computer goes into hibernationor standby. When the Laptop is woken up, you are restored to the exactplace you were before. Standby and Hibernation use a low powerconsumption mode, with enough power to preserve the content of suchmemory. This means that Laptop computer can wake up without a fullrestart and loss of work.

    Laptop does not wake up from Standby or Hibernation

    Here are my tested suggestions:

    - Give it time - some older Laptops may take up to 30 seconds to wake up - fully
    - Some Laptops have special keys or buttons for 'Wake Up' - read the manual
    - Press and hold the Laptops power button for five seconds or more.Some Laptops are configured to Suspend or Hibernate with a press of thepower button. Holding the power button for 5+ seconds will usuallyreset and reboot the Laptop
    - As a last resort, remove the laptop battery and the power cord, wait30 seconds, replace the batteries and reconnect the power cord

    Now that the Laptop is operational, you should research the underlyingproblem. Typically, such problems arise from a disagreement eitherbetween the power management features of the Laptops BIOS and Windows.

    A conflict with the Laptops BIOS power management and Windows powermanagement is the most common cause of such wake-up failure. Trydifferent settings in the BIOS to see if that might solve the problem.Look to see if the Laptops BIOS is configured to suspend the computer,and how it compares with the value configured in Windows. In most caseslet Windows control the power management.

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