CF-19(5) Mk 7 Multi-touch screen (mostly) bad?

TLDR; Can a bad screen occasionally work but mostly not? Sound like a known failure mode?

I got the device blank and with no stylus. I installed Windows 10, Ubuntu, then Mint. Touch screen didn't work with any of the above. I ordered a replacement touch screen thinking it was a touch only model. I opened the screen case, disconnected the three visible ribbon cables and then realized the replacement screen wouldn't work since mine was a multi touch with wacom digitizer.

I reconnected the ribbon cables and put the case back together. At this time, I received the Win 7 factory reinstall disks. I also received a replacement stylus. I installed the factory disks and Voila the stylus and touch both worked beautifully. I played around with it for a few hours.

Overnight, Win 7 did a lot of updates and at the end of them, neither stylus or touch worked. I groaned and did the factory reinstall again with plans to disable Windows 7 update. It still doesn't work. Tried factory refresh many times and can't get stylus or touch to work again.

It's maddening that I got it to work for just a few hours. Before I was convinced the hardware was bad. But now I don't know.

 

1) Do you have Mosart Multi-Touch Device in your Device manager? What's the driver version? Show photo/screenshot of HID devices.
0) Check your touchscreen is still enabled in BIOS.

 

"Mosart" is not there. touchscreen is enabled in BIOS. You want photo of items under "Human Interface Devices" for HID? I can get tomorrow, but there are currently two entries: "HID-compliant device" and "Tablet Buttons for Panasonic PC".

 

The one time it worked, there was a slide out panel on the left side of the screen. The many re-installs I've done since then don't have that. Running the Touch Calibrate gives me "This application program is not fully supported under the current type of PC."

 

I'm not sure whether your hardware is ok, but let's presume it's a driver problem.
I see you've already used factory reinstall disk for your CF-195D.
Try to install panasonic one-click drivers bundle on your current OS installation. If it doesn't help - clean OS installation (Win7/10) and one-click drivers bundle. Not using factory disks this time.