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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: dougal on March 03, 2012, 04:39:45 PM

Title: A500 keyboard fix ?
Post by: dougal on March 03, 2012, 04:39:45 PM

Some keys are not working

I pulled the keyboard apart and the membrane looks good, no darker patches or anything. I cleaned it up anyway. The keyboard controller board also looks fine.

What could be wrong ?

Title: Re: A500 keyboard fix ?
Post by: dougal on March 03, 2012, 04:46:11 PM

Its a row of keys not working.

9,O,L,>.

Title: Re: A500 keyboard fix ?
Post by: Zac67 on March 03, 2012, 04:46:59 PM

CAPS LOCK not flashing at power up? -> no power or dead controller
CAPS LOCK stuck after pressing a few times -> bad data connection to mainboard
some keys not working -> depending on layout, bad key contacts, bad matrix lines or bad controller

PS: 9, O, L  - definitely a bad column line, check/measure the common line of those keys running to the controller IC, it's probably bad somewhere (or the solder point)

Title: Re: A500 keyboard fix ?
Post by: dougal on March 03, 2012, 07:29:16 PM

Quote from: Zac67;682320

CAPS LOCK not flashing at power up? -> no power or dead controller
CAPS LOCK stuck after pressing a few times -> bad data connection to mainboard
some keys not working -> depending on layout, bad key contacts, bad matrix lines or bad controller

PS: 9, O, L  - definitely a bad column line, check/measure the common line of those keys running to the controller IC, it's probably bad somewhere (or the solder point)

Great! I;ll take a look tomorrow then

Thanks