Question about Logitech Cordless Desktop EX110

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EX110 Keyboard: Some Keys don't work

A friend of mine took his keyboard apart to clean. (By clean I presume he spilt something on it, so he took it apart to dry it.) Now some of the keys don't work (A,S,D,F & J,K,L.) I've had a look but cannot see anything wrong, gave it a clean with Isopropyl Alcohol, but it still won't work. Any clues, as to what I can do to fix it?

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GandalfUK,

What can be done depends greatly on WHAT was spilled on the keyboard, AND what your experience with electronics is.

All of the keys you indicated are on the same key row as each other. The way a keyboard works is that there is a grid pattern of electronics traces(lines) that run below the membrane (Rubber or plastic seal) just below the keys. The controller determines which key you push by checking for what column connects with what row.

Well since all of the keys you have indicated seem to be from the same row, I would say that something damaged the trace for that row.

Which leads me to believe that what he spilled was something acidic (Soda, orange juice etc..)
If you have experience with electronics you can remove the control board from its casing, be sure to remember where EVERYTHING came from (Draw yourself a diagram if you have to) then inspect the board for damage. You should be able to SEE the grid patter of contact pads. there are several rows, the one you want is 3rd from the bottom. If there is OBVIOUS damage your in business. clean it up and you can buy whats called a trace pen from an electronics specialty store. This is much like a ballpoint pen but instead of ink it has metal flakes suspendend in an electrically conductive epoxy. Draw in the gap in the trace with this pen and let cure usually 5 minutes but follow the curing time on the pen if different. then you can reassemble.

If you don't see any damage then you have to use a multimeter to narrow down the location. If you don't have a multimeter or the experience to track the trace to an open. Then it would likely be cheaper to just purchase a new keyboard. Not sure what they cost in the UK but their about $30 USD which if the exchange is what I remember is about 12 Pounds.

Hope this helps
Dave

Posted on Nov 17, 2008

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