On 13/09/2010 19:40, V G wrote:
> Update: My keyboard almost works! But it works in a weird way. i can
> type most keys, but the arrow keys don't work and i can't apply the
> shift key to normal letters. for example, if i press the shift key and
> type 'i', to type an uppercase i, nothing happens. However, it works
> for shift+1 (!) and some letters like the 'H'. i don't think this is a
> milk under the keys issue. What could this problem be coming from?
It's an X-Y matrix.
bottom layer with metallisation on top
thin layer plastic with holes
top layer with metallisation on bottom.

It's still damp. It may not fully recover without disassembly and clean=20
in soapy water then IPA. (Alcohol).

The keys press the two outerlayers together. Any damp in between or on=20
the pair of tails going to single chip scanner/encoder and Host=20
interface (PS/2, USB, Bluetooth, whatever) and you get strange keycodes=20
or key combinations making normal codes.

I have boxes of usb, PS/2 and AT keyboards from scrapped PCs. If a=20
keyboard goes dodgy I keep the chip for PIC or PC custom X-Y button=20
encoder and scrap the rest.
--=20
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