I am trying to convert a HP EliteBook 840 G7 notebook from a non-touch to a touchscreen. I purchased a complete touch LCD assembly with a screen/back cover/bezel/video cable and swapped it out with the original non-touch LCD assembly.
The screen works but the touch does not. I know the new LCD assembly is completely functional because we tried it on a similar touchscreen EliteBook 840 G7 and the touch works there.
I contacted the seller and he said screen conversion like this will not work due some difference in the motherboard for non-touch and touch capable EliteBook 840 G7.
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Hello,
I have a question that's driving me a bit nuts recently.

Is the touch board on Surface Pro 4/5 somehow married to the motherboard? I have a few Surfaces that, after the touch board change, lost all touch functionality.

- I tried flashing the bios (simple ME clean from a known good bios, previous bios didn't have an intergrated hub enabled), reinstalling firmware, reinstalling windows and even new touch boards.
- In one instance, after I tried to troubleshoot by using a known good screen + touch pcb combo on a Surface that lost touch, the touch board...

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