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Hardware Thread, Laptop repair issue in Technical; Just stripped faulty laptop to remove lcd cable. Stripped down good laptop to remove lcd cable, motherboard end of cable ...
  1. #16

    plexer's Avatar
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    Just stripped faulty laptop to remove lcd cable.

    Stripped down good laptop to remove lcd cable, motherboard end of cable differen, doh!!!!

    Put good laptop back together, ran out of screws, lol, someone has had it apart before judging by all the marks on the casing where they levered the hell out of it due to not knowing what they were doing with it.

    Do I spend 10 on a new lcd cable or not?

    Ben

  2. #17

    plexer's Avatar
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    Oh and motherboard on the dodgy laptop looks absolutely fine.

    Ben

  3. #18
    kevin_lane's Avatar
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    Yea I would at least if its 10 and it dont work then you haven't lost a lot really just means he owes you 2 pints lol

  4. #19

    mac_shinobi's Avatar
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    How much is a replacement system board ?

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    plexer's Avatar
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    @mac_shinobi around 30 - 35 for a 2nd hand one on ebay

    Put the new lcd lead in tonight and it's still the same, my next suspect is the screen hall effect sensor that's connected to the power switch and operated by a magnet under the bezel.

    Ben

  6. #21

    mac_shinobi's Avatar
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    Laptop repair issue

    @plexer - You got a link to one of those. Not heard one of those being mentioned before as a cause to issues with the screen

    I would have thought

    1) Inverter ( depending on the type of screen and or laptop as may be that the circuitry on the motherboard that deals with stepping up the voltage / ampage to get enough power to the screens back light or just the screen in general ). I know on some laptops they had the inverter as a separate small pcb that the screen connected into such as the dell D630 as per this video :

    http://www.youtube.com/watch?v=_ILAkFWp3gQ&sns=em

    2) LCD Cable which you have already tried

    3) The screens back light has blown or gone dimm so needs a replacement screen

    If the inverter circuitry is on the motherboard itself then will need a replacement motherboard

    Obviously any items you replace or any work you do on laptops you need to ensure that the battery and mains cables are dis-connected before doing replacements of any components

    Think I mentioned the above previously but just saying again
    Last edited by mac_shinobi; 29th March 2014 at 08:01 AM.

  7. #22

    plexer's Avatar
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    Lcd screen so no inverter the new screen is fine.

    Most laptops either have a micro switch or hall effect sensor to detect when the lid is closed.

    Ben

  8. Thanks to plexer from:

    mac_shinobi (29th March 2014)

  9. #23

    mac_shinobi's Avatar
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    Laptop repair issue

    Quote Originally Posted by plexer View Post
    Lcd screen so no inverter the new screen is fine.

    Most laptops either have a micro switch or hall effect sensor to detect when the lid is closed.

    Ben
    That or the FN Key and another key to increase and decrease brightness or switching modes ie single, cloned, external only , extended desktop etc, bios setting to select the default mode and if it uses the laptop screen / docking connector etc etc

    Might have to use an external monitor and the FN and other key to switch to the external screen to see the bios settings

    Wondering if its maybe the gpu / graphics chip over heating ?
    Last edited by mac_shinobi; 29th March 2014 at 10:23 AM.

  10. #24

    plexer's Avatar
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    Nothing in the bios just hooked it up to an external monitor, the fn key combinations for brightness etc... though are user controlled every laptop has a hardware method of determining lid position.

    Ben

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    mac_shinobi (29th March 2014)

  12. #25

    twin--turbo's Avatar
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    So both screens light on another system but not on this system.

    Certainly sounds like the fuse for the backlight has blown on the motherboard.

    Rob

  13. Thanks to twin--turbo from:

    mac_shinobi (29th March 2014)

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    Looking at page 22 of the service manual, there doesn't look like there are any fuses, but definitely resistors that can blow and a mosfet.

  15. Thanks to difinity from:

    mac_shinobi (31st March 2014)

  16. #27

    plexer's Avatar
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    All fixed, replaced the power switch with new hall effect open lid sensor and now have control over the backlight.

    Ben

  17. Thanks to plexer from:

    difinity (7th April 2014)

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