Windows 8 and 8.1 Forums

What have I broken?

  1. #1


    Posts : 1,875
    Windows 10 Pro Prieview x64

    What have I broken?


    I was replacing the screen on my Lenovo X201 laptop when I made an error of some sort.

    After installing the new screen and while the laptop was still disassembled I thought I'd plug it in (charger not battery) and see if it worked before putting it all back together. There was immediately a very loud screeching noise. I honestly don't know if it sounded like it was from the speakers or not as it was a few months ago now. There was no smell of burning though and the MB looks OK.

    I reassembled the laptop and this is its condition now:
    • New screen doesn't work
    • VGA doesn't work (it did before I tried replacing the screen).
    • It will boot OK and I can access it through RDP (luckily I'd enabled remote access before breaking the screen).
    • BOIS can't see temperature sensors so fans never power up. To work around this I downloaded TPFanControl and set the fans to run continuously at maximum. TPFanControl can't see the temperatures but Speccy and HWMonitor can and the temperatures are OK. Fan speed is not shown in HWMonitor but I can feel the hot air being blown out.
    • There is an intermittent whining noise (which could be the fan).
    • It will run fine for 15 - 45 minutes and then just shut down. I've booted it probably 100 times and it always shuts itself down within this timeframe. Never earlier or later. There is no warning and it is not related to temperature or whether I'm doing anything on it at all (see picture below of last shutdown - it was only ~60 degrees).

    Does anyone have a clue what could be wrong? Perhaps some fuses are blown? If possible I'd like to have a stab and fixing it at least so it doesn't keep shutting down - I don't really care about the screen but VGA would be useful in case it doesn't boot in future for some reason. It isn't worth paying to get it fixed and I've not got anything important on it so I figure it is worth a try.

    Any ideas where to start bearing in mind I know nothing at all about hardware?

    Click image for larger version

      My System SpecsSystem Spec

  2. #2


    Posts : 2,690
    Windows 3.1 > Windows 10


    remote access gives you access to windows - If you have factory software installed , you should be able to run hardware diagnostics

    Don't know what info you have but found this - http://download.lenovo.com/ibmdl/pub...43y6632_11.pdf

    Hardware maintaince manual page 39-40

    I also assume you disconnected the new screen - you got external vga?

    Also look the MOBO over real good - there are very small ic chip fuses - your look for small dark brown spots.. Hell sometimes they just crack and are very hard to find..

    I have changed many screen and test in the same manner as you did - screen laying on table..

    I have had them screech before to - what I do not remember.. Count your screws and sniff around the board and look real close.. there is only one fan - but several heat sinks - and over heated chip will cause a safety shut down..

    It is a hard thing to troubleshoot without the pc in hand - way to many variables
      My System SpecsSystem Spec

  3. #3


    Posts : 1,875
    Windows 10 Pro Prieview x64


    Thanks but I think I know that manual almost off by heart by now unfortunately

    I can't run anything that you need to boot from as I can only connect through RDP and for that the OS needs to be running.

    If I could get VGA working I could do it (does it have a fuse I could have blown?) otherwise I can only do any tests that can run while 8.1 is running. Or tests that involve a multi-meter checking voltages.
      My System SpecsSystem Spec

  4. #4


    Posts : 2,690
    Windows 3.1 > Windows 10


    page 39 hints at a windows directory for dianostics

    the ic fuses are smaller then the size of a grain of rice..

    My guess would be video card caused by screen

    Attachment 58295
      My System SpecsSystem Spec

  5. #5


    Posts : 1,875
    Windows 10 Pro Prieview x64


    Quote Originally Posted by KYHI View Post
    page 39 hints at a windows directory for dianostics
    I downloaded and ran all the tests (CPU, PCI, Memory, Video, Motherboard) in extended mode and they all completed successfully.

    Quote Originally Posted by KYHI View Post
    the ic fuses are smaller then the size of a grain of rice..

    My guess would be video card caused by screen
    That is what I'm after I think. I could drop a bit of solder on it perhaps (if I knew where it was). I don't have a video card (it is Intel HD) but I think a fuse is blown somewhere but I don't know how to identify it.
      My System SpecsSystem Spec

  6. #6


    Posts : 2,690
    Windows 3.1 > Windows 10


    the fuse(s) are labeled on the MOBO - and there are several... usually they crack and are very hard to see..

    You are going to use a volt/ohm meter set on dc volts - ground one lead on a MOBO grounding screw and test for voltage on both sides of the fuse..

    And yes I have replaced bad fuses using junk boards - or remove the fuse and solder a trace.. Although the fuse was put there for a reason..

    I have also replaced and jumped bios password ic chips - to re-gain access to the password protected bios
    I've done a lot of laptops, made a decent living for a while on ebay buying dead laptops
      My System SpecsSystem Spec

  7. #7


    Sydney, Nova Scotia, Canada
    Posts : 6,490
    Windows 10 Education 64 Bit


    Does device manager show anything with a yellow ! or Red X? I'd open it up and double check all your connections, if you haven't already that is. Check the cooling fan to make sure something didn't fall into it or that its not rubbing on something.
      My System SpecsSystem Spec

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