Any Tricks for Fixing Laptop Keyboards?

Question

Dell Inspiron 1501 Keyboard has 11 keys that don't work. Spread all over the keyboard in small groups. I'm assuming it's a standard X-Y matrix with an open trace somewhere. Haven't found any hints that there's a standard for such things.

If I had five hands, I could probe the thing in place. Not much chance of connecting the cable otherwise.

Been thinking about measuring capacitance at each line and watching it change as I poke a key. Or injecting RF and tracing it around with a current probe on a spectrum analyzer. I once fixed a matrix by hitting it with a stun gun and looking for the arc.

Any clever ways to figure out where the line break might be?

Yes, I know I can buy a used keyboard for $8, but that's 8x what the laptop is worth, and I wouldn't have nearly as much fun.

Thanks, mike

N_Cook · Accepted Answer

The last regular x-y matrix of keys I saw was perhaps 20 years ago, ever since some apparently random walk pattern. All 11 keys probably on one trace. Go on, you know you want to, try your stun-gun kill-or-cure approach again

mroberds · Answer

Have you tried unplugging it and plugging it back in? The keyboard, I mean.

If there's a hard plastic connector on the end of the flex cable, sometimes it loosens itself as the laptop is knocked around. Or, if it's the kind where the flex goes right into the motherboard connector, sometimes gunk spilled into the keyboard gets into the connector.

Matt Roberds

chuck · Answer

I haven't had any luck trying to repair that keyboard.  I would get a new one.  I think they were around $16.00 shipped on EBay.

Any Tricks for Fixing Laptop Keyboards?

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