Phantom Touchscreen Input

[andyhipsgray]

Hi

I've been having trouble with the touchscreen on my MDA Vario III, I'd be grateful from some advice from some of you hardware gurus.

It seems to be detecting phantom touchscreen input, which can prevent it from properly detecting real input. This was evident in the Notes application, if I were to tap around the screen in draw mode it would sometimes draw dots, but often draw a straight or curved line between the last point and the most recent one. I thought something might be pressing on the borders of the screen so I did the thin card round underneath the bezel thing, which if anything made it worse, though that may just be me imagining it.

I sent it off to a local repair firm for a touchscreen replacement, got it back this morning and it seemed to be ok, but not perfect. During the morning, having rerun kaisertweak and installed a couple of cabs, it deteriorated again.

Right now it's cycling round the Alignment Screen, the cross is moving around on its own periodically. If I try tapping the cross it mostly doesn't detect the tap.

So right now, I've got a month old Kaiser, warranty void and insurance not applicable, that I simply can't use!

My question really is, what could the problem be if it isn't the touchscreen/digitizer (they are one unit on the Kaiser aren't they?) and it doesn't appear to be a physical problem with the housing of the screen? Does it imply a mainboard failure?

Does any user configuration at all survive a hard reset? Such as increasing the touchflo sensitivity with Kaiser Tweak?

Thanks

hipster

[michi123]

I did/do have the exact same issue, however on my unit it only happens when using some third party stylii (spelling?)....one old Ipaq 3970 metal stylus, and 2 multifunction pens. Using the onboard stylus (or any other light stylus, like the one from the P3600) I encounter no problems (knock on wood), no matter how hard I poke on the screen....
Unit is over 3 months old - have gotten used to it, just don´t use any heavy/metal stylus.
Your problem, however, seems to be a bit more pronounced.....:(

[andyhipsgray]

Thanks for the reply, michi, though your problem does sound a bit different, if just a change of stylus improves it.

I've tried the stylus from my old Wizard and the arse end of a pen, without success, sadly.

Oddly, I'm starting to think it might be slightly heat related, if I leave the phone off for a while it seems ok, and stops responding to taps more after it's been on for a while. Very strange.

hipster

[andyhipsgray]

I knocked up an impression of what I get when tapping in a pattern in the Notes application, image attached.

Reading other posts about perceived performance problems with the Kaiser, I wonder if there are other cases where it seems like it's locked up, but in fact it's just taking an age to figure out what you've just asked it to do, essentially just a problem with the touchscreen, not the whole device. That's definitely one of the symptoms I get....

It's back with the menders now, hopefully, they'll manage to sort it out this time...

Cheers

hipster

[jgermuga]

Not sure if it could be similar, but I had a Tablet PC which was prone to interference from the power supply. Perhaps this is the case. May the sheilding is not up to snuff? I am by no means an expert, but this might give you another path to explore for problem resolution. Hope it helps.