Just today, my laptop crashed while maximising a mkv HQ video.
Upon forced reboot, it no longer showed anything　on the screen. The screen did backlit, but with nothing on it. But the laptop seems to be booting just fine so I suspect if I had an external screen, I could connect it to VGA out and carry on.

Anyway, it looks to be Nvidia-related. I took the laptop apart and checked if screen connection with the mobo is find, but it seems to be in order. I disconnected the small battery to see if BIOS reset will solve it, but no. Neither did switching with keyboard shourtcut between internal and external display (it only lights-up the back light).

This is ThinkPad R61 with Nvidia Quadro M140

So, few questions:
1. Do you know what could be causing it?
2. Would it be covered by Lenovo`s replacement program of laptops with manufacturing defects in nvidia chips?
3. If so, where should I take it to next? I am in France.
4. If　not, what are my repair options - of course if you suspect what could have happened.

1) the nVidia chip breaking down inside the chip itself. Well documented all over the T6x forum.
2) No.
3) Nowhere.
4) Replace the motherboard either with the same type, but produced in or after August 2008, or replace with a matching mobo with Intel graphics.

I just went through the same scenario as the OP with my T61, computer started rebooting when doing some intense video work, followed by a blank image on screen with the backlight on. Replacing the board with one with Intel graphics was very easy and I would recommend going that route.

Lenovo was replacing out of warranty laptops (or repairing the chip issue or whatever), but that program had ended.

So is it definite that this is the case? The laptop n ever rebooted itself before.
Is it possible to still use it on vga out?

Strictly speaking, your symptom (backlight on, no image, laptop working) can also be caused by a loose or damaged cable between the motherboard and the LCD. But the odds of something like this happening out of the blue without the machine going through some physical shock are small.

Assuming it is the nVidia issue, then it does not always manifest itself the same way. It is possible that the VGA output will work just fine, and the machine will be generally stable. It is also possible the VGA is busted too and/or the machine will be crashing often even if it somewhat works. No way to know other than to test and see.

I contacted Lenovo and they say they are unaware of such replacement program, finished or not.
They want me to give them a link to some mention of it on do an official Lenovo website. Do you know of one?

Also, I read somewhere that t61s produced on and after August 08 are supposed to be free from this nvidia issue. My r61 is from August '08. What do you think?

I contacted Lenovo


They replied



This seem to suggest they don't consider the replacement program elapsed, but only my laptop unqualified for it. However, r61 is made of the same parts as t61 which means there might be a r61 dedicated document.

Is anyone aware of MIGR-75087 equivalent for R61 series?

There's no point wasting any more energy on this.
Lenovo has stopped repairing those machines under warranty around March 2011, period. No ifs and buts.
You'll have to bite in the sour apple, and buy another motherboard.

What do you think of baking the board in the oven? Two years back, I restored my old hp laptop with screwed up nvidia chip this way, but the symptoms of failing gpu were quite different.

If there was a reliable repair for this problem, there would be a "Sticky" note at the top of this forum. Follow RBS's advice...

The sticky is in the T4x forum. You take your chances, and if you have more time than money, how much worse could you make it? (follow all the warnings and remove everything BTW, that way you can't damage anything besides the motherboard which is already considered "broken")

viewtopic.php?f=2&t=57021

Problem solved, at least for the moment.
I baked the motherboard for 10 minutes at 210 Celsius in the oven and computer works like new. I hope it stays that way for more than just few months.

I just checked with CPU-Z. Thank god both my T61's have the nVidia A2 chipset. Awesome. What a relief?
Now, I need to find a solution to the hindge problem where both the screens are swaying 1-1.5 inches when in open position.

I wouldn't worry about the swaying hinges. It is just not worth the time and utterly uneconomical to fix.
I no longer notice it at all.

Don't get to excited here, the A2 is meaningless. The old and new design both carry this revision number. nVidia treated this problem as a "quality control" issue rather then a revision. To avoid labeling all the old chips as bad, they did nothing to change the numbers on the new ones so the only way to know for sure is the production date on the laptop. Prior to 08/08 it's believed the updated design was slowly introduced, so it's just pure luck which you get. The only thing we know for sure is that even lenovo couldn't tell the good from the bad and had to destroy all the boards and replace them with ones build with new chips in July. If your laptop was build in august, it will have the new board with new chip.

Well, I bought both of these T61's used from the same seller. The only hope I have is that the board was replaced under the recall or warranty. Both of these have the A2 on the chip as observed by CPU-Z. Both the laptop's were manufactured in 2007, and not 2008. So I am praying that the boards were replaced at some point. Fingers crossed. Not sure what else I can check?

Really? Maybe I will get used to it. But can you tell me if the fix is replacing the actual hinges is the solution or are the hinge tabs coming loose inside the LCD?

Sorry to threadcrap. Don't mean to.

I wouldn't be so sure about that. My laptop was built in August 2008.


Yeah, it's the hinges. You will spend weeks hunting them online, and they are not cheap, either.
Then then arrive, you install them and realise they have exactly the same wobbliness as your old ones.
This is the most likely scenario.

But come on, it's not like you often operate your wobbly screen laptop while riding a stage coach on dirt roads between Chicago and Black Hills before the annexation to Dakota territory.

And, by the way, my 08/08 Nvidia is A1, so it's a bit more likely yours is the new sort.

Thanks lockheed and others for your valuable input.
Just before I am writing this reply, the same seller emailed me that there was another T61 to be had. I asked for verification on the nVidia chip to make sure it was A2. Should I buy yet another T61?

Are these great units to have around as backups or cheaper alternative workhorses for regular stuff like emails and general web surfing? I am not looking to stress these with games etc. My question relates to whether T61's are a good, if not great laptops to have around?

Thanks to all for sharing your wealth of experience.

Personally, I find the T61 ugly, poorly designed and annoying laptops to have around.

Agreed, but I am looking for a workhorse. Looks like T61 was after transition from IBM to Lenovo and some of the parts were quality parts. So I was just hoping and banking on the laptop working a long time for its intended purpose.

@velani:

If you're looking for a workhorse, get a T400/500 or a W500. Way too many gray areas when it comes to T61 generation.

I'd *never* rely on a nVidia-based T61 or R61 as my main machine. YMMV.

Understood that T400/500/W500 might be a workhorse and that T61 has questionable nVidia chipset. But my only lure was the price I was getting these T61's at, which is in the $150 or sub-range.

I wonder if I should pass on the 3rd T61? I am to meet the seller in 1.5 hours from now.