Touch Screen Stopped Working

[omnichad]

I am working on a Lenovo Ideacentre B550 all-in-one with a 23" touch screen. It recognizes the touch screen in device manager, but it does not respond at all to touch.

It appears as an "HID-compliant touchscreen." I tried forcing Windows not to put any of the USB Input Devices to sleep, and I even disassembled the entire unit to check the connection on the touch control board.

I booted from an Ubuntu LiveCD and it is detected, but non-working. I tried cat /sys/class/hidraw/hidraw4/device/uevent (hidraw4 is the touch screen) and there is absolutely nothing displayed when I touched the screen.

There is no replacement digitizer or screen assembly available at a reasonable price as best as I can tell.

This is for a non-profit, so I'm trying to keep the cost as low as possible. It's likely that I'm going to recommend buying a touch screen monitor and having them use that.

I'm trying an update to Windows 10 now, just because - I really don't expect anything to come of that.

Does anyone have anything else I should try?

 

[River Valley Computer]

We had a touch Lenovo in last week with the same issue. It was not real obvious that the driver in Device Manager was not enables. Ben enabled it and went to the right area of the task bar and enabled TABLET. Now this was Win 10.

 

[MichaelEC]

When you look at the driver information in Device Manager or Ubuntu equivalent, does it state "further installation required" under the 'Details' tab?

 

[omnichad]

No - HID Compliant Touch Screen is all. On Linux, I actually get a mfgr detected, too (AU Optronics). Using input.inf driver out of the box on Windows, hid_multitouch on Linux. Lenovo doesn't even list drivers for it, so it's intended to be driverless. And of course HID is a standard that is supposed to be driverless anyway. Have enabled / disabled, removed and re-detected.

I think something is wrong with either the digitizer or the digitizer control board. I am going to just have them buy an external touch screen display. Found them a great deal on an open box screen that's probably going to beat any repair price even if I could find the parts.