Summary: Replacing a laptop keyboard is possible if you know what you're getting into. Through photos, I'll show you how I replaced my wife's laptop keyboard.
I get a lot of questions about stuck or broken keys in keyboards. Occasionally, it's a software issue, but more often than not it's a physically broken key. On desktop machines that's not an issue; replacement keyboards are readily available, and easy to replace.
Laptops, however, are a different matter.
Sure enough, over the past few months my wife's laptop started having issues with the space bar and no amount of compressed air or other cleaning techniques would fix it. It was time to replace it.
I brought my camera along so I could show you what it took to replace it.
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Important Important Important
This is not meant as a "how to" for your laptop. Every laptop is different, and the steps I'll demonstrate below will likely be very different for different brands and models of laptops. How you open it up, how you remove and reinstall the keyboard ... heck even if you can replace the keyboard ... is going to be highly dependant on exactly what model of computer you have. You'll need to check with your computer's manufacturer for specific instructions.
That being said, I'll show you the steps I took so you can at least get a feel for what kind of a job it might be. If what you see is scary and something you'd never want to try, then you know you'll want to take it to a pro. On the other hand if what you see seems reasonable, you can take the next step of finding out more about your specific laptop.
As always, I can't make guarantees. You could break it. Heck, I could break it, which leads perfectly into...
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The All Important First Step
It's tempting to skip the first step. Do not skip the first step. You will be sorry if you do.
Breaking your computer is bad.
Breaking someone else's computer is worse.
Breaking your spouse's computer is ... better left to the imagination.
Hence, here's the first step:

In over 30 years of working with computers, experience has shown that whenever I'm about to play with hardware on a computer that's even marginally important, a backup "in case something goes wrong" is critical. (And your spouse's computer is always much more than "marginally important".) After taking a backup onto an external drive even if the laptop bursts into flame while I work on it, I've got everything safely saved to restore onto a repaired or replacement machine.
Take a full backup before you begin.
Do not skip the first step.
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Here's the laptop:

It's a well used Dell Latitude D610 with a fair number of "miles" on it. You can see that the keyboard shows signs of wear.
We begin with an important second step: removing the batteries:

This prevents the machine from being accidentally turned on while we're in the middle of ripping it apart. (And yes, this laptop has two batteries, one in place of a CD/DVD ROM drive.)
Next we open the D610 by carefully prying off the plastic access cover that runs along the top of the keyboard that happens to include the power and audio buttons:

Having done so, you can see the exposed electronics across the top of the keyboard:

It's difficult to see in that photo, but there are exactly two small screws that hold the keyboard in place. Removing those allows the keyboard to be carefully lifted up, except:

There are two tabs on the actual laptop plastic case, one on each of the left and right sides, that hold the keyboard in place. They need to be carefully held aside and the keyboard can be angled up some more. Then you can slide it up a little at which point it's entirely free except for the cable.

Do not stress the cable. Even on the old keyboard which you'll likely throw away, pulling or indiscriminately yanking on the cable could actually damage the circuit board that it's plugged into.
In the D610's case the cable connector actually includes a plastic tab that can be held on to so that you can carefully disconnect the keyboard cable:

Things are a little tight, so take your time, again, not stressing the computer, cable or keyboard.
The result, a laptop with no keyboard:

Here's the replacement keyboard, ordered direct from Dell:

The next step is to connect the new keyboard's cable. Once again, this is slightly cramped work that needs to be done carefully:

Now you can slide the keyboard down into place, and the top two screws can be replaced:

It's at this point, before closing things back up, that I inserted one of the batteries, booted the computer, and ensured that the new keyboard was, in fact, working. (It was - hooray!) I then removed the battery (perhaps not absolutely necessary in this case), and continued.
The last step was to replace the plastic access cover by carefully pressing it back into position:

That's it.
My wife's laptop now has a working keyboard once again.
One final, and important, picture to illustrate some fundamental problems:

Only after I was satisfied that the new keyboard was working did I remove some of the key tops on the old broken one. This picture shows where the spacebar used to be. There are two things to note:
The Dirt - keyboards have long been known to be the dirtiest part of your computer, and you can see why. A lot of dirt, and in our case pet hair, gets trapped underneath those keys. Regularly blowing out your keyboard with compressed air helps some, but over time the results are inevitable.
The Switches - after removing the spacebar the cause of the actual keyboard problem was fairly obvious. The spacebar on a D610 actually activates three separate switches so that no mater where on the spacebar you press, you get a space. What you can see, if you look carefully, is that the switch on the left is broken - it doesn't come back up after being pressed down. The center switch is OK. (The right hand switch was a casualty of removing the spacebar.)
All in all, replacing this laptop's keyboard is "do-able" if you have some small amount of ability and dexterity. Other laptops, as I mentioned, may vary a great deal. Hopefully knowing that the keyboard is likely to be the most commonly broken part of the machine, your laptop's manufacturer will have made it relatively easy to replace.
Related:
My '2' key stopped working. How do get Windows to recognize it again? Every so often a keyboard stops working or acts up. It's tempting to look everywhere but at the most likely culprit: the keyboard itself.
Help! My Shift key is stuck! Windows has an accessibility feature that's very easy to turn on by mistake that changes the behavior of your shift key and others.
Article C3614 - January 6, 2009
Hi Leo
Concerning "How to replace your laptop KEYBOARD"
I think you have done a great disservice to your readers by publishing the article even though it is technically correct, this procedure is not for the "faint of heart". The odds of ever reconstructing your laptop and having it still work is minimal at best. I would equate it to dismantling your Rolex watch, cleaning it . reassembling it (if you can) then expect it to ever work again. Remember computer manufacturers pay huge amounts of money to be able to pack in a whole bunch of of component in the least amount of space. Did you ever try to work on a Porsche, same principal.
To me the only 2 viable solution to a broken keyboard is; hook up a USB (wired or wireless)keyboard or if it is not possible to carry the "extra" keyboard around and you absolutely need a portable computer, Bye a new one. PS same solution for a broken monitor.
PS. I fully agree with Bradley. I've been working with computers for quite a few years. (1954) yes going on 55 years. Working on the biggest and the smallest.
With no infections ever. At present I run 3 laptop's and 2 desktops. all hooked up to the net. Like you said, the secret is watch what you are downloading. Be careful, it's a dangerous world out there.
Best Regards
Lou
Posted by: Louis Gervais at January 13, 2009 11:06 AMGreat share of information.
Posted by: Snail at January 13, 2009 2:50 PMOf course taking apart anything, especially computers, comes with its risks. This helps to understand one possible disassembling scenario. Thanks for sharing.
I agree, using a grounded glove would be helpful.
Also, I would prefer a wireless keyboard(and mouse if I used it) as I could then position the monitor of the laptop to where I don't strain my neck, while placing the keyboard in my lap.
redefining the laptop needs to happen.
ergonomic needs must be met
I've had to do this job 3 times on my son's Dell (keep drinks away!!!).
Posted by: Carl R. Goodwin at January 13, 2009 5:52 PMFind yourself some pictures on how to take your model apart w/ a "disassemble Sony ----" in Google. Don't fall prey to downloading instructions from Ebay.. anything they're selling is available to you too with enough searching.
The trick is not to bust anything. Some laptops come apart harder than others, but when engineers design & put things together.. they also have to come apart.
As far as people here claiming the "sky is falling".. it certainly is not. Alarming people is the real disservice.
And adding a wireless keyboard indeed defeats the entire laptop concept.
For God's sake.. it's not the space shuttle.. it's a laptop keyboard replacement.. !!
Posted by: flaude at January 13, 2009 7:22 PMHey there Lou: in your message above you mentioned that Leo did a disservice to readers by describing this procedure.
You mentioned one of the viable solutions is to buy a new lap top.
But if you are going to buy a new lap top... then what have you got to lose by trying to fix the old one?
I don't think the odds of success are as low as you think. In all my years I know 2 people who changed their laptop keyboards and both operations were successful.
So I simply think the odds of success are not as bad as you implied.
However I do agree with you that it is dangerous. There is a high chance of failure. So it's risky.
But it's worth a shot if your only other real option is to buy a new lap top. In that case you may as well roll the dice and hope for the best!
Posted by: Velocity Wave at January 15, 2009 12:38 AMYo!
Posted by: Mr Yo! at January 16, 2009 6:18 AMYour article sure is good. It will sure benefit my good friend who has a "thousand year-old" laptop. The pictures included will also be of good help!
Dear Leo ,Please ignore the alarmists !!!
"Scifisam" Working on any small delicate equipment is possible with good eyesight and at least able to read and follow instructions.A little dexterity is also helpful,if you happen to be a klutz I wouldn't advise trying
Posted by: Scifisam at January 19, 2009 5:20 PMTHANKS FOR YOUR ARTICLE I GOT 2 BUSTED KEYS ON THIS EXACT MODEL THANK GOD THEY ARE THE FUNCTION AND ONE CONTROL KEY (THERES 2!!)AND AM PLANNING ON BUYING A REPLACEMENT KEYBOARD OFF EBAY AND WAS WONDERING HOW TO TAKE IT ALL APART. I BUSTED THE KEYS REPLACING THE RAM UNDER THE KEYBOARD AND JUST NEEDED TO KNOW HOW TO DISCONNECT THE CABLEKNOW THAT i FIGURED OUT HOW TO TAKE THE KEYBOARD OFF THE HARD WAY. THANKS AGAIN i KNOW HOW TO DO ALL THIS TYPE STUFF ON A DESKTOP BUT THIS WAS MY FIRST LAPTOP.
Posted by: ALREADYFUBAR at February 26, 2009 12:42 AMi spilled orange juice on my laptop and the keyboar won't work. it is a samsung model. is it possible to fix my keboard? thanks
07-May-2009
If you have ever replaced a cover on the front of a ( CD rom, Cd RW, or DVD device ), you are more than able to do this. It is not rocket science and I think some of these comments were made by somone who might be trying to discourage some people. They may rather have them take the item to the computer repair shop, so they can pay somone 150 dollars to have it done, plus a mark up on the price of the part. Maybe that is what they do for a living? Stealing from the meek. The procedure shouldn't take more than an hour at tops, and if you have any clue what your doing I would say a half hour or less. Just be careful not to break any plastic clips, and do not force anything to move. Once I went in to have my oil changed in my truck. They wanted entirely too much money to change it and I said so. The young man told me it would be way to hard for me to do it myself....What? I had been changing my own oil for years before that, and NEVER had a problem. It would have just been a convienece to have someone else to do it for me. Do not underestimate yourself. It is darn near as easy as changing ram in a desktop! If you do not know how to do that, well you might not want to try this.....
Posted by: Alan at November 17, 2009 6:56 PM