IBM R31 local mouse stick not working

[burntfingers]

I recently got 30 of these notebooks to repair and sell as used, nice for training.
Most work just fine - after installing Windows XP & Word 2000.
But I have three or four where the little red stick to move the mouse doesn't work.
Already replaced keyboards and inspected the thing visually.
Checked a few site on Google, too.
No luck.

[b700029]

Re: IBM R31 local mouse stick not working

Does it not work in all operating systems e.g. if you boot a Ubuntu livecd does it still work?

Schematic:
http://www.4shared.com/office/USrS9klE/file.html
(yes, these are made by Acer )

Page 27 is the keyboard/trackpoint circuit. Looks like the trackpoint just uses PS/2 mouse-compatible signals via pins 37 and 39 of CN14 (keyboard connector). If you have a 'scope or LA you can check the clock and data lines for activity.

(Or alternatively hook up the trackpoint pins to a PS/2 mouse port on a regular PC and see if it works.)

[burntfingers]

Re: IBM R31 local mouse stick not working

Does it not work in all operating systems e.g. if you boot a Ubuntu livecd does it still work?

Schematic:
http://www.4shared.com/office/USrS9klE/file.html
(yes, these are made by Acer )

Page 27 is the keyboard/trackpoint circuit. Looks like the trackpoint just uses PS/2 mouse-compatible signals via pins 37 and 39 of CN14 (keyboard connector). If you have a 'scope or LA you can check the clock and data lines for activity.

(Or alternatively hook up the trackpoint pins to a PS/2 mouse port on a regular PC and see if it works.)

Thanks for the tips, much appreciated.

[joeyjoey]

Re: IBM R31 local mouse stick not working

Just got an IBM R31 with non-functioning Trackpoint - guess what!? There is a setting deep in the BIOS setup involving the Trackpoint mouse, with "enable/disable" options - just click on it and set to "enable" and problem solved!