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Help with Amilo xi3650 giant laptop

Discussion in 'Hardware' started by Aislingeanbeag, Jul 11, 2019.

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  1. Aislingeanbeag

    Aislingeanbeag Thread Starter

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    Jul 11, 2019
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    I inherited an old xi3650 fujitsu laptop with the super spec [twin hdds , 18.4 hires screen, blueray, bluetooth, wireless, multi card reader HDMI remote control etc etc ]which is running superbly on win 10
    Unfortunately it has an intermittent problem of a dark screen i.e. back lights turning off
    I have stripped the beast and checked all connections and narrowed the cause to the magnetic lid sensor switch being sticky but does anyone know
    Where it is sited ?[The small strong magnet is in the lid behind the screen bezel so I presume the switch will be mounted on the main board where the magnet meets the speaker trim panel]
    Is t a magnetic reed switch?
    What is specification ?
    Could it be disconnected or short circuited [Is it normally open or closed]
    How do I get at it ?
    Is it possible to degauss insitu?

    Help !
    Please!
    Fujitsu Siemens are not playing nicely
     
  2. managed

    managed Trusted Advisor Spam Fighter

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    First Name:
    Allan
    Hi and welcome to TSG.

    As you said the switch will be under the lid magnet so you should be able to find it by inspection.
    They are usually Hall Effect switches, with no moving parts, they look like a small IC chip.

    Why are you so sure it's the switch ? As a test check if closing the lid always puts it to sleep (set it to do that if it isn't already), if it does the switch probably ok.
     
  3. Aislingeanbeag

    Aislingeanbeag Thread Starter

    Joined:
    Jul 11, 2019
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    Thanks for the reply!
    With no operating system loaded the backlight always comes on when the power is pressed and the display shows the splash screen as normal and calling the bios screen works. However when the fault shows the backlight turns off within 2 or 3 seconds. The delay suggests to me that this occurs as the POST is completing pre boot.
    The closed lid sensor being latched in the closed state would explain how the proximity magnet being remote from the switch has no effect however it does not explain how the switch sometimes unlatches and then everything performs in a normal fashion.
    The mainboard in that area is not accessible without a full disassembly and no visible is currently possible.
    I presume that the lid sensor cuts the low voltage supply to the inverter and query therefore if a dry joint would not give the symptom . As the backlight can be induced to re-light sometimes, either momentarily or permanently, by vigorous movement of the lid, this would suggest a dry joint or cracked trace allowing contact when tiny flex in the frame allows, I would add however that the cables can be moved without any effect so indicating that there is no broken core conductor.
    So after going around the circle several times I am now focused on the lid sensor and probably completing the full disassembly.
    It is probably good that this is a hobby project as it will never be cost effective!
     
  4. Aislingeanbeag

    Aislingeanbeag Thread Starter

    Joined:
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    Oh well it is up and running again so I have put it back together and will use it as a desktop substitute and keep the lid open as leaving with the lid closed brings on the problem
    If or when it happens again I know that a quick solution will probably be to present a Magnetic pole opposite to the polarity of the actuator magnet but if it is a dry joint then I will just have to fiddle with the lid and hope.
     
  5. managed

    managed Trusted Advisor Spam Fighter

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    First Name:
    Allan
    I'm glad you've made some progress and can use the laptop. (y)

    You could remove the magnet, then you might be able to close the lid.

    (If/when you think it is please click on the [Mark Solved] link at the top of your page).
     
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