[Q] Touch does not work but S Pen does

[bochocinco23]

As weird as it sounds, touch screen does not work but the S Pen does. I know the obvious reaction would be that the digitizer is bad BUT, I took the motherboard out of my other Note 3 and placed in this phone and the digitizer functions just as it should. It is as if there is something wrong with the motherboard but I'd like to see if it is fixable or if anyone else has had this issue. Any suggestions on how to correct this without getting a new motherboard? Any help is appreciated. Thanks.

Current OS: MJ5 4.3

 

[touch-aaron]

That happened to me twice. Once a week after opening it, and a factory restore fixed it. It happened again about 6 months later, and I had to send it back.

 

[Rukbat]

It could be anything from a bad chip on the motherboard flaking out once in a while to a bad connection on one of the pins on the screen cable. A dirty pin is fixable most of the time, a bad chip isn't.

(The S-Pen has nothing to do with the digitizer - it doesn't press on the digitizer, it interacts with a magnetic field the phone produces yjat runs about half an inch above the screen [see how high you can lift the pen before you lose the "pen cursor"]. The pen will work even if the digitizer is shot. On the other side, if the magnetic field or associated circuitry is bad, the pen won't work even though the digitizer does.)