Question about Lenovo ThinkPad T61 Notebook

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I have a IBM Lenovo ThinkPad T61. My laptop had been having problems with its fan (makes loud noises, overheats, then shuts off). Whenever I reboot (or turn On from Off state), it says "Fan error" on a black screen with 2 beeps, then pause for about 3 seconds, then shuts off with 1 beep (doesn't even load Windows). This is why I usually just put the laptop to sleep rather than turn it off. So, I restarted my laptop because Windows Update required me to, and the fan error problem showed up. I tried pressing random keys like F2, F12, "ThinkVantage", etc, but then somehow my display went totally black. I opened up the laptop, but I'm pretty sure I didn't screw anything up (an experienced friend of mine was with me when I opened it up, but unfortunately he couldn't figure out the problem). I tried to looking up the fan problem, and found out it's a common "BIOS" problem, and you can bypass it by pressing Esc; now I realize why I was pressing all those random keys--I forgot it was the Esc key that did the trick. I'm not even gonna bother to solve the BIOS problem as long as my laptop can run its basic features. But, my display is not showing at all. Any idea what could be wrong with my display? Possibly a loose connection/wiring inside the laptop? Maybe I accidentally disabled the laptop's display by hitting random keys?

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  • xb75 Feb 23, 2009

    The CPU is most likely damaged (and that's why it performs much slower than before, I believe)... I've had this fan problem for more than half a year now.

    No, I did not replace the fan. I've started using an external laptop fan since a few months ago; it stopped the laptop from shutting down automatically (from overheating).

  • xb75 Feb 23, 2009

    I believe the CPU (or some other part of the laptop) may have been partially damaged due to the extreme heat, but I'm almost sure that they're still functional. The display problem occurred a couple of attempts of rebooting after seeing "Fan error".

    I do not plan to replace the fan; the laptop can run on the external fan (underneath). I plan to use this laptop for a couple of more months, if I can get the display to work.

  • Anonymous Mar 12, 2009

    I have the same problem with the LCD going black (with some random strips of white).

    The CPU is not demaged (not in my case), as I can get it to work with an external monitor. It works only in VGA mode.

    I have tried reinstalling Vista from scratch, and in those attempts, the LCD eventually came back on. So I know the LCD is good.

    Unfortunately, after a few hours, it goes black again.
    I think the graphics (NVIDIA) chips fail when the system overheats.

  • Thomas F. Schneider May 11, 2010

    Did you ever replace the defectuive fan? If not the CPU could have been damaged from overheat. 



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Even if you replace the CPU now, You will still need to replace the defective fan.

Posted on Feb 23, 2009


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SOURCE: Schematic for Lenovo T61

Idon't know of any source for any of the mother boards. Part of this is due to the extreme complexity. I would be happy to even find parts layout and/or block diagrams for these critters but have yet to find any. The best that I can do for you (or me!) is to point you towards a copy of the maintenance manual. Let me know if that will help you.

Posted on Dec 17, 2008

SOURCE: ThinkPad T40 Vs ThinkPad T61


Posted on Mar 31, 2008

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SOURCE: ThinkPad T61 -- At power-up,

The problem with the LCD, or LCD inverters connection. sometimes, rarely, drivers.

Posted on Mar 14, 2011

  • 228 Answers

SOURCE: I'm trying to connect my


Question #1. Yes, all laptops has a video card. A laptop will not boot up without a video card.
Question #2. No, your laptop already has a video card.

For some information.
In a laptop, you either have 1 or 2 video cards installed in it. One is the video card that is already bundled with the motherboard (we call it integrated) and the other one is another video card that is attached to the motherboard (we call it dedicated). A dedicated video card is bundled to a laptop for purposes of use, mainly for graphics related businesses (like drawing, animation, gaming etc.).

Hope this helps.

Posted on May 30, 2011

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If you want the solution to your problem, I need the info off of the bottom of the laptop.

Using Lenovo ThinkPad T61 6458-GW4 as an example;

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Don't care what Device Manager states. Need to reinstall the Audio driver.

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You need to make sure that the processor heatsink/ fan assembly is clean of any dusts.

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