From: Kate Ross (kate_at_bored.lexxdog.com)
Date: Wed Sep 20 2000 - 12:10:20 EDT
Ok my spare unit has arrived and I have had the opertunity to play
around some. The KB on the system that just arrived works fine on the
new system, however when moved to the old system shows the same symptoms
as the old KB, ie: several double keys. As a second check i moved the KB
for the old system to the new system and it works fine. From this it is
an easy conclusion that the issue is definitly with the system board not
the KB. Thanx for all the help and feedback all. So I have now combined
what appear to be the best parts from both systems and have a very nice
looking 701cs running FreeBSD 4.1 and x :)
kate
Kate Ross wrote:
>
> Ok lets consider the tp701 butterfly kb. Pulling the unit off you see
> that there are no electronics on the KB, just the two foil patterns to
> form the matrix.
>
> If I unplug both KB sides, left and right the trackpoint work s fine.
>
> With just the right hand side plugged in all the keys fiction correctly.
> Everything appears fine.
>
> With JUST the left side plugged in there are a number of keys such as
> caps lock, s, x that produce a phantom keystroke of keys that exist only
> on the right hand portion of the KB. Since that KB section is totally
> unplugged from the laptop system board this would appear to indicate
> that the issue is with the KB decoding logic in the system board itself
> not the KB.
>
> After all at this point eh lines to produce say a . when the x is
> pressed are physically disconnected from the system board ? Does this
> make sense ? Someone on the list has offered me a system with dead sound
> for a good price so I could likely use that system board, I didn't look
> when i had the KB off mine, is the sound board a seperate subsystem or
> am I just replacing one problem for another ?
>
> To be honest I'm currently un-employed and can't really afford to just
> through away the system but would really like to be able to make a
> working system without too much investment as I purchased the system as
> working.
>
> Shoulf I just try for a refund from the purchaser ? The system was
> advertsed as in working condition when i bought it, and thre seller says
> it was working fine when they shipped it. Am I juust out of luck here?
>
> A very frustrated,
>
> kate
>
> Bill Morrow wrote:
> >
> > OK, the minute is up..
> > my bet is the keyboard...
> > it is the part most prone to failure, the failure is only with a few keys and not the entire keyboard...
> > AND, i'm sure someone will correct me on THIS assertion, i'm not entirely sure there ARE two keyboard
> > controllers on a laptop..
> > (please use fresh fruit when throwing things<g>)
> >
> > p machule wrote:
> >
> > > Wait a minute !
> > > The fact that the unit works with an external keyboard does NOT prove that the keyboard controller is fine.
> > > This is a laptop ...not a desktop .
> > > It has 2 ( sort off ) keyboard controller(s).
> > > Part one translates the row and columm stuff , part two is what we normally see on standard motherboards .
> > > It takes standard keyboard signals ,plays with them , and and sends them to the chipset.
> > > I'm sure that on most laptops this chip is one chip and resides on the motherboard.
> > >
> > > Good luck ;-}
> > >
> > > ...peter..
> > > ----- Original Message -----
> > > From: Kate Ross <kate_at_bored.lexxdog.com>
> > > To: <penzance_at_gate.net>
> > > Cc: ThinkPad List <thinkpad_at_cs.utk.edu>
> > > Sent: Sunday, September 10, 2000 10:48 AM
> > > Subject: Re: 701 question
> > >
> > > > So my question for the list now is does anyone have a spare KB or dead
> > > > unit with a good KB that thay they want to part with for a reasonable
> > > > price ?
> > > >
> > > > kate
> > > >
> > > > Bill Morrow wrote:
> > > > >
> > > > > Kate..
> > > > >
> > > > > i'm not entirely sure i agree with your conclusion..
> > > > >
> > > > > did you not say earlier that you attached an external keyboard and that it
> > > > > worked..?!
> > > > >
> > > > > the 701's are still serviceable..
> > > > >
> > > > > Kate Ross wrote:
> > > > >
> > > > > > Ok apears that the issue is likely with the KB controller itself. I
> > > > > > pulled the unit apart and with just the right side oof te kb attached
> > > > > > all the keys work great. With the left side only attached you get ghost
> > > > > > keys appaering the the right side. I would suspect that from what i know
> > > > > > this means I have a bad system board :( I was really haoping to be able
> > > > > > to use this system whe i am in the hostital in a few month's time so I
> > > > > > would like to work this out. Should i even consider such and old unit
> > > > > > for service ?
> > > > > >
> > > > > > thanx,
> > > > > >
> > > > > > kate
> > > > > >
> > > > > > Bill Morrow wrote:
> > > > > > >
> > > > > > > Kate..
> > > > > > >
> > > > > > > the 701 keyboard is composed of two "membranes" (one for each half) and its
> > > > > > > rather easy to get into it and clean the "contacts"..
> > > > > > > BUT, these "contacts" are little more than printed wiring..
> > > > > > >
> > > > > > > go into easy setup (hold down the F1 key while powering the 701 on..
> > > > > > > select the test icon, then hit Ctrl-A, then Ctrl-K..
> > > > > > > you will be presented with a keyboard layout..
> > > > > > > depress each key and the related point in the display kbd will turn on or
> > > > > > > off..
> > > > > > >
> > > > > > > try it..
> > > > > > >
> > > > > > > works with most thinkpads..
> > > > > > >
> > > > > > > Kate Ross wrote:
> > > > > > >
> > > > > > > > I just recently aquired a gorgeous 701cs, the unit looks almost brand
> > > > > > > > new and seems to function great except for one issue, the KB is working
> > > > > > > > abit oddly, for instance hitting L gives me LS, as does hitting just S.
> > > > > > > > It would appear to be a KB or controller issue. Anyone have any
> > > > > > > > suggestions for these units ? Should I look for a repleacement KB, or
> > > > > > > > maybe try dissasembling this one and cleaning all the connectors ?
> > > > > > > >
> > > > > > > > thanx,
> > > > > > > >
> > > > > > > > kate
> > > > > > >
> > > > > > > --
> > > > > > > ---
> > > > > > > Well from the looks of the KB test looks like one of the row/colum
> > > > > > > select lines are sharter as the doubled keys repeast ina patter, ie:
> > > > > > >
> > > > > > > s or l pressed both present sl
> > > > > > > w or o pressed both present wo
> > > > > > > caps or f7 pressed both present caps+f7
> > > > > > > f1 or f8 --> f1+f8
> > > > > > > . or x --> x+.
> > > > > > > 2 or 9 --> 2+9
> > > > > > >
> > > > > > > all other keys seem to be ok.
> > > > > > >
> > > > > > > Anyone have any dissasembly advice for theese units ?
> > > > > > >
> > > > > > > kate
> > > >
> >
> > --
> > ---
> >
> > Happy trails...
> >
> > ** Bill Morrow ** :-)
> > WEB page http://thinkpads.com
> > e-mail: bill_at_thinkpads.com, penzance_at_gate.net
> > open forum: http://www.afaonline.com:8080/webboard/$webb.exe/~2/login?
> > sic transit gloria
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