What have I broken?

adamf

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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?

Screen Shot 2015-02-20 at 12.11.08.png
 

My Computer

System One

  • OS
    Windows 10 Pro Prieview x64
    Computer type
    Laptop
    System Manufacturer/Model
    MacBook Pro Core2Duo
    CPU
    T7600
    Memory
    3
    Graphics Card(s)
    ATI Radeon X1600
    Monitor(s) Displays
    Internal
    Screen Resolution
    1440 x 800
    Hard Drives
    40GB
    Keyboard
    Apple
    Mouse
    Apple
    Internet Speed
    Varies
    Browser
    Various
    Antivirus
    Defender
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/pu...x200si_x201_x201i_x201s_hmm_en_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 Computer

System One

  • OS
    Windows 3.1 > Windows 10
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Dell XPS 8700
    CPU
    I7
    Memory
    24 GB
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 Computer

System One

  • OS
    Windows 10 Pro Prieview x64
    Computer type
    Laptop
    System Manufacturer/Model
    MacBook Pro Core2Duo
    CPU
    T7600
    Memory
    3
    Graphics Card(s)
    ATI Radeon X1600
    Monitor(s) Displays
    Internal
    Screen Resolution
    1440 x 800
    Hard Drives
    40GB
    Keyboard
    Apple
    Mouse
    Apple
    Internet Speed
    Varies
    Browser
    Various
    Antivirus
    Defender
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

View attachment 58295
 

My Computer

System One

  • OS
    Windows 3.1 > Windows 10
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Dell XPS 8700
    CPU
    I7
    Memory
    24 GB
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.

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 Computer

System One

  • OS
    Windows 10 Pro Prieview x64
    Computer type
    Laptop
    System Manufacturer/Model
    MacBook Pro Core2Duo
    CPU
    T7600
    Memory
    3
    Graphics Card(s)
    ATI Radeon X1600
    Monitor(s) Displays
    Internal
    Screen Resolution
    1440 x 800
    Hard Drives
    40GB
    Keyboard
    Apple
    Mouse
    Apple
    Internet Speed
    Varies
    Browser
    Various
    Antivirus
    Defender
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 Computer

System One

  • OS
    Windows 3.1 > Windows 10
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Dell XPS 8700
    CPU
    I7
    Memory
    24 GB
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 Computer

System One

  • OS
    Windows 10 Education 64 Bit
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Asus
    CPU
    AMD Phenom II X4 980 Black Edition Deneb 3.7GHz
    Motherboard
    ASUS M4N68T-M V2 µATX Motherboard
    Memory
    8GB 4GBx2 Kingston PC10600 DDR3 1333 Memory
    Graphics Card(s)
    NVIDIA Geforce GT640 2 Gig DDR3 PCIe
    Sound Card
    VIA VT1708s High Definition Audio 8-channel Onboard
    Monitor(s) Displays
    22" LG E2242 1080p and 2 19" I-INC AG191D
    Screen Resolution
    1280x1024 - 1920x1080 - 1280x1024
    Hard Drives
    Crucial MX100 256 GB SSD and 500 GB WD Blue SATA
    PSU
    Thermaltake TR 620
    Case
    Power Up Black ATX Mid-Tower Case
    Cooling
    Stock heatsink fan
    Keyboard
    Logitech Wireless K350 Wave
    Mouse
    Logitech M570 Trackball and T650 TouchPad
    Internet Speed
    80 Mbps Down 30 Mbps Up
    Browser
    Internet Explorer 11
    Antivirus
    Windows Defender
    Other Info
    HP DVD1040e Lightscribe - External USB2
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