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This happens a lot with Palm digitizers. The only permanent solution is replace the plastic digitizer with an upgraded glass type. Before considering that, see if removing screen protector helps. (yeah, didn't think so. Worth a try!) Try Powerdigi, a better calibration program. Get it from http://www.palmpowerups.com It worked for me.
First you should make a reset by pushing the button at the base of the phone close to the mouth piece.Then get some sort of stylus maybe from another phone and go to the phone settings and navigate through to the phone display option, where you have the option of realligning your screen.Follow the instructions there and then go and get another stylus for your phone.Your thumb sweat is not touchscreen friendly!
Unscrew the 4 torx screws on the back and remove the cover carefully.
Unplug the battery for 30 seconds. plug it back in and re- assemble the unit. Once it comes back on it will give you the chance to re calibrate the digitizer ( or you can now select it from the prefs menu)
If the touchscreen fails to repsond you will need a new digitizer.
You can purchase it from :
My suggestion if you have Sprint, go to their corporate store. They charged me $35 for a new phone. I did not have their $7 a month warrenty... but I do now. The only thing they will not do is replace the phone if it was in water.
Try soft reseting your phone. If that doesnt work then try hard reseting. To soft reset take the stylus pen and push in the little hole on the bottom of the phone. You should feel a little click and then your phone will restart. Wait until your phone starts up again and if it still isnt working then do a hard reset.
To hard reset, hold down the green send button and the red end call button at the same time and continue to hold them down as you then push your stylus pen into the hole on the bottom of the phone untill you feel the little click. Your phone should start to reset. Be warned you will loose any information saved to the phones memory ie: phone numbers, pictures, personal settings. Anything saved to your memory card should be ok.
If your screen remains blank after trying both resets I would suggest taking it back to where you got it and and have them fix it or replace it.
Hope this is helpful.
Solved same problem.
Same model ipaq 1940.
Sorry for my bad english;this is what You can do:
Open the ipaq
Remove the mainboard
My problem was the connection between LCD and Touchscreen.
So I solved putting on the connection 3cm of tape to have a fully
working contact.Indeed, the lower part of cable, with the 2 little
holes was disconnected.
After this all becames to life!
I hope helps!
In italiano: 3 cm di nastro adesivo fra LCD e touchscreen.Il loro
contatto non era perfetto.Ora tutto funziona.Con un po' di manualità si
riesce a fare senza problemi!
Haha I love the Centro. You need to perform a system reset to the phone the directions are in your manual. Basically, the touch screen is screwed and by reseting it and following the prompts that should resolve your issue. You don't lose any information either so you have nothing to lose.
You may have dust accumulation around the edges of your touchscreen, between the screen and the case.
Try using a can of compressed air. Gently press down on the edges of the touchscreen to expose the gap between the screen and the case, and shoot the air in there. This worked for me when my Treo 600 touchscreen stopped responding.