[NTLK] Newton touchscreen not responding

[Simone Picchioni]

Hi Frank,
it's nice to see you again :)

black plastic pen holder is correctly screwed in. I've also checked
rectangular rubber under touchscreen cable and added a little thickness
(with a sort of cardboard).
I think that pressure is enough but touchscreen still doesn't work :(

I'll try to put a little quantity of "silver conductive compound" on
touchscreen cable tracks...it should fix it.

Bye,
Simone.

2015-01-04 1:21 GMT+01:00 Frank Gruendel <newtontalk at pda-soft.de>:

> Sorry for the delay. I haven't been home for a couple of days. After that
> all hell broke loose and I had to take care of things that didn't allow for
> any delay.
>
> > I took my multimeter and I made some measures using my
> > multimeter (hope I didn't made mistakes) :
> >
> > WITHOUT TOUCHING TOUCHSCREEN:
> > - Contact 1 - 3 : 528 Ohm
> > - Contact 2 - 4 : 404 Ohm
> > - Contact 1 - 2: /
> > - Contact 3 - 4: /
> >
> > TAPPING THE SCREEN:
> >
> > - Contact 1 - 2 :
> > A)  890 Ohm
> > B) 710 Ohm
> > C) 1200 Ohm
> > D) 860-900 Ohm
> >
> > - Contact 3 - 4 :
> > A) 794 Ohm
> > B) 1158 Ohm
> > C) 541 Ohm
> > D) 873 Ohm
> >
> > Results are very different from yours. Tell me what you think about :(
>
> I am inclined to think that either you or me mixed up b and c when putting
> down the results. Swapping these values would at least put yours and mine
> in
> the same range.
>
> One thing your results tell us, is that the four leads in the ribbon cable
> seem to be correctly connected to the touchscreen, and there appear to be
> no
> shorts.
>
> Just for the record: In order for the touchscreen to work, at least the top
> two of the four screws that hold the black plastic pen holder part must be
> screwed in, oterwise the ribbon cable will not be sufficiently pressed
> against the contacts on the main logic board. Also, make sure that the tiny
> rectangular rubber piece below the ribbon cable is in place, otherwise the
> pressure won't be sufficient even if the screws are fastened.
>
> > Here's the photos of interconnect port connector you asked
>
> They seem OK to me now. I was probably misled by some shadows on the images
> you sent earlier.
>
> Cheers
>
> Frank
>
> -- Newton software and hardware at http://www.pda-soft.de
>
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