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I spilled some water on the left side of my Microsoft 4000 Ergonomic Keyboard causing several keys to malfunction. Most started working again after leaving the keyboard upside down in a warm-air clothes dryer for an hour.

I presume there is some lingering moisture which is causing the keypress errors. Should I be worried about permanent damage and what can I do to get the remaining keys back?

Here is a list of broken/malfunctioning keys, in case it helps to pinpoint a solution:

z, c (prints x), Right Shift, 7, 8, 9, 0
Delete, Page Up, Num-4, Num-5, Num-6, Num-(, Num-), Num-=
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Just put it on top of a heating for a day. – twall Sep 2 '12 at 22:57
    
I think the question was clearer before the edits, but thanks anyway. – pate Sep 3 '12 at 21:13

Seal the keyboard in a plastic bag with a handful of uncooked rice for a day or two. The rice should absorb any moisture thats left. If the keyboard continues to malfunction, the water has probably damaged the circuitry and it will have to be replaced.

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Silica Gel would be a better option but not as cheap. – Moab Sep 4 '12 at 13:56

When it comes to Microsoft Natural keyboard this is unfortunately quite a common experience, i just lost a second keyboard to a small water spill. Interestingly enough almost exactly the same keys stopped working.

The keyboard is a membrane keyboard. There are three sheets of plastic, with middle one having small circle cutout, through which bottom and top layer may contact when the key is pressed. When you spill water on the keyboard around middle section it will actually follow the incline, and go down on top of the membrane without entering it. Then it will pool in the place pointed out on the picture where incline ends.

Water pooling spot

Then water will enter the membrane from the side. On the membrane you have conducting lines, that are sort of printed on, sadly seems like water basically dissolves those. On the second picture you can see the spot where I took of first two leyers of membrane to show the bottom one. The gray lines, actually are no longer conducting (I checked with a multi-meter)

Damaged paths

So the only way to fix it would be actually to use some wire glue or conductive silver and fix up the connection manually. I will try that next but it will require some serious precision work.

I suppose the best course of action if you do spill water on your keyboard would be to immediately unplug it, flip it upside down, to limit water contact with membrane, and then stuck it in a plastic bag with rice / silica gel hoping that the permanent damage has not occurred yet.

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If it is indeed plain, clean water (and not coffee or soda pop) then you're in luck -- likely after drying out it will work again.

Unplug the keyboard and attempt to shake/tap/blot out as much water as possible, then leave the keyboard leaning against something at about a 45 degree angle with the keys facing down for several hours, blotting up any moisture that appears. Then place in a slightly warm (not hot) location for at least 24 hours. (It may take 3-4 days in some cases.)

If after 3-4 days the keyboard is not working (you may have to "limber it up" by working the keys a bit) then it's probably toast.

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Should I remove the keys to help with drying? – pate Sep 3 '12 at 10:57
    
The keys on most modern keyboards are not designed to be removed. And removing them would not help much anyway. – Daniel R Hicks Sep 3 '12 at 14:08

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