My keyboard died

Nes4life

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OK, so for most people this is no big deal but i'm a programmer by trade and I've had this keyboard for a loooong time and i'm quite attached to it (sad I know). No other model comes remotely close to it's usability: it's an Apple a1048 keyboard.

A column of keys and the spacebar all stopped working and so I went about attempting a repair. I opened it up got out the multimeter (on continuity) and found two broken traces. Initially I thought it'd be an easy repair but then i realised the broken traces were on a clear film-like membrane (like acetate) and wouldn't stand up to soldering. I looked up what other people use and I discovered the wonderful world of conductive ink / paint. All I need is some conductive ink but the problem is that it costs more then the replacement keyboard! A pen costs £15+ in the UK and a keyboard was £10 delivered from CEX. I saw some videos about making conductive ink from charcoal but that's a lot of faff (and my charcoal wasn't conductive at all).

A tale of woe that ends with a keyboard being saved for spares because of two broken traces that I can see but can't bridge. If I can resurrect this keyboard then i'll be upgrading it to either house a USB 2.0 hub or i may embed a PI into it and make a self-contained PC / console. Anyone got some ink spare?!

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Nes4life

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Just ordered some graphite powder which I'll mix with black acrylic paint. Apparently if you mix it 1-1 then you end up with a highly conductive mix once dried. I'll draw over the track breaks using a toothpick and then dry with a hairdryer. Patching pcb traces with paint is semi-interesting (I think so anyway!)
 

bonehead

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Hi, if you have no luck I have a bottle of the conductive paint. It's the same stuff they use in heating elements in windscreens.
Give me a shout if you want me to post it to you. I would like it back but you are welcome to use what you need.

Steve
 

Nes4life

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Cheers steve, I'll give my experiment a go first and let you know the results. It seems a reasonably cheap solution at £4 for the powder delivered (from Amazon) and £1 for some paint from Rymans. Fingers crossed.
 

bonehead

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Ok, I only saw your first post this morning.
Try it on a similar surface and check for continuity before you apply it to the keyboard membrane.

Steve
 
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