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MobilePro 900C's keyboard gone bonkers

TheMaritimeMan Page Icon Posted 2018-03-08 5:00 AM
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Hi all - I pulled my NEC MobilePro 900C out of storage for the first time in a few years. It worked fine when I put it away, but using it now, the keyboard has gone totally nuts. Many keys now, when pressed, output their character plus some other character. For example, in WordPad (or any application), when I press 'a' it types 'as'. When I press '1' it types '12', and 'o' types 'o.'. Pressing Enter types '1' and then does a carriage return. It's so weird. I performed a hard reset, and that didn't change anything.

Any idea what might have happened? I assume it's some hardware issue, and it's maddening to think just sitting on a shelf for four years (plugged in, even) broke it somehow.
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C:Amie Page Icon Posted 2018-03-09 4:25 PM
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Best case, the flexi PCB connector of the motherboard is lose. Worse case there is a damage/shorted/cracked/dry solder trace on the keyboard PCB or motherboard. If it's the former, unscrew her and reseat the orange ribbon cable and all will be well.
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Rich Hawley Page Icon Posted 2018-03-10 8:51 PM
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Excellent advice… though the 900 is a pain in the butt to get the ribbon cable seated well…
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smb_gaiden Page Icon Posted 2018-03-11 1:50 AM
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Then get some preparation-h, cortisone cream, and then for the electronics: some sticky tape and/or hot glue.
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Rich Hawley Page Icon Posted 2018-03-11 8:32 PM
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I've had similar keyboard probleks when I've spilt liquid on the keyboard too.
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smb_gaiden Page Icon Posted 2018-03-12 12:35 AM
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'Probleks'? did you spill your beer again?
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CE Geek Page Icon Posted 2018-03-12 2:36 AM
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Yeah, and it must've been a British brew since he "spilt" it.
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C:Amie Page Icon Posted 2018-03-13 4:04 PM
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Nice to see my Britishness finally rubbing off on some of you. It's only taken 15 years...
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Rich Hawley Page Icon Posted 2018-03-14 1:37 PM
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Blimey, you guv'nors' are bonkers...I mean I reckon C:Amie is full of beans, but CEGeek, he's just barmy...
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smb_gaiden Page Icon Posted 2018-03-16 3:20 AM
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You're such a gas!
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mr-mac Page Icon Posted 2018-03-16 8:05 AM
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Or in Scotland Ma 900c Keyboard is scunnerd ????????

Edited by mr-mac 2018-03-16 8:06 AM
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Nuketank Page Icon Posted 2019-04-19 2:20 AM
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I've seen this kind of problem myself, in a full-size classic computer I'm working on.
My knee jerk would also be the keyboard ribbon cable.
Specifically, make sure that it's not cross-seated in the socket to short any of the pins together.
(Sadly in my project computer this is NOT the problem and I have a lot of troubleshooting ahead of me.)
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