19 replies
by doug
I'm sure you've tried another known good keyboard. If after trying this the system still won't recognize the keyboard, you should probably examine the keyboard connector on the motherboard for a broken connection or cracked/cold solder joint. I've assembled several systems in the past like the one you've assembled that exhibited faulty keyboard connections and have traced the problem to the conector.
If you feel confident, go ahead and resolder the 5 connections and the 'strap' that secures the DIN connector to the motherboard. Make sure to use a 10 to 25 watt, grounded iron and rosen-core solder.
If that doesn't fix the problem, try replacing the keyboard BIOS if it is socketed.
Doug F.
by johnjds
by dhpee
by johnjds
by rlberg
Some systems care if the PS/2 mouse and PS/2 keyboard plugins are reversed, others don't. Having made this mistake, I can tell you that when you have the connections reversed eithe the keyboard or the mouse won't work. Try reversing the connections between the mouse and the keyboard!
Because this is an older machine, I don't think that I'd trust the stickers on the computer, perhaps the mom-board was replaced with a non-conforming replacement.
by johnjds
by dig-log2k
Since you've used components from a few machines I'll suggest to remove all components (leave memory and processor), reset BIOS and also check if
motherboard is not in contact with computer casing.
Good Luck!
by johnjds
by johnjds
by johnjds
by bwaggoner
by johnjds
by dobick
If you are like me, you save old computer parts and do what we have done and build an extra computer. In saving all my junk parts I have parts left over from my old XT days, you might check the keyboard and see if it is an old XT keyboard from an old 86 or 286 system, if so you will need to see if it has a little switch on the bottom or somewhere else that lets you switch between AT and XT, set it to XT, if not would suggest trying a keyboard from an AT system and see if it works if it does, then go out and get a cheapy keyboard someplace.
Hope this helped,
Doug
by johnjds
by cybertek1
by johnjds
by johnjds
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