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T420 Trackpoint buttons problem

T400/410/420 and T500/510/520 series specific matters only
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scramble45
Posts: 4
Joined: Thu Sep 12, 2019 11:32 pm
Location: Kansas City, MO

T420 Trackpoint buttons problem

#1 Post by scramble45 » Thu Sep 12, 2019 11:50 pm

I think I may have blown a fuse or something. I have tried the following to get my Trackpoint Buttons working:

All other keyboard functions work expect Trackpoint buttons.
  • Reset bios
  • Re-flashed bios 1.52
  • Tried setting defaults in bios
  • Tried reseating the flex cable
  • Turned bios enable on and off on save for trackpoint
Based on the available t420 schematics is there a specific fuse number I could look at? I'm a little lost as to which pin goes to just those buttons.

RealBlackStuff
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Re: T420 Trackpoint buttons problem

#2 Post by RealBlackStuff » Fri Sep 13, 2019 12:22 am

Fuses F13 and F21 (both type ERBSD1R00U) near KB connector.
What happens if you disconnect the trackpad?
Reinstall KB-driver and/or trackpad driver?
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scramble45
Posts: 4
Joined: Thu Sep 12, 2019 11:32 pm
Location: Kansas City, MO

Re: T420 Trackpoint buttons problem

#3 Post by scramble45 » Fri Sep 13, 2019 7:50 am

RealBlackStuff wrote:
Fri Sep 13, 2019 12:22 am
Fuses F13 and F21 (both type ERBSD1R00U) near KB connector.
What happens if you disconnect the trackpad?
Reinstall KB-driver and/or trackpad driver?
Thanks for the reply, so If I am looking at this correctly those come off keyboard connector pins: 38 and 35, correct?

I havent tried just leaving the trackpad unplugged. Will try.
Yeah tried drivers but usually just run GNU/Linux

RealBlackStuff
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Re: T420 Trackpoint buttons problem

#4 Post by RealBlackStuff » Fri Sep 13, 2019 9:56 am

Yup.
Don't know Linux options.
Lovely day for a Guinness! (the Real Black Stuff). And pigs CAN fly!
Check out The Boardroom for Parts, Mods and Other Services.

scramble45
Posts: 4
Joined: Thu Sep 12, 2019 11:32 pm
Location: Kansas City, MO

Re: T420 Trackpoint buttons problem

#5 Post by scramble45 » Fri Sep 13, 2019 7:10 pm

checked both fuses and they seem to be good... maybe the keyboard itself... Got a whole parts laptop coming next...

scramble45
Posts: 4
Joined: Thu Sep 12, 2019 11:32 pm
Location: Kansas City, MO

Re: T420 Trackpoint buttons problem

#6 Post by scramble45 » Sat Sep 14, 2019 11:43 am

After all that, it came down to a bad keyboard. Just goes to show you that you should try the simple things first. Think you have a bad keyboard, buy a new one and try that first.

We can lock this thread. Thanks all.

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