Touchpad not working properly after changing LCD and invertor

Product - HP Pavilion DV4 1318TU
I was having display problems, went through repairer. He changed the LCD, invertor and fixed some issues of motherboard(related display output). After fixing these issues i am facing touchpad issues. Touch is not working properly, and when I use USB mouse its working but after 1-2hr mouse is also not working properly. I connected to external monitor then touchpad is working fine without any issues. Kindly help me and tell me the root cause.
Thanks

Hey @ashfaque91 ,
Welcome to the HP Forums!
I understand the touchpad and mouse are not working on your notebook after having your display serviced.
It seems quite odd that they would work fine on an external monitor, and to be totally blunt this is something I cant even attempt to explain.
Was this service provided by an HP service provider or was it done by an independent provider?
Try using the notebook in safe mode to see if there is an issue with the display driver causing some kind of wonky issue. Without knowing which version of Windows you are running I cannot tell you exactly how to boot safe mode on your notebook, but you can find this information easily by searching "Safe Mode Windows #" in Google.
Other than this I would suggest getting back in touch with the service provider if the issue started immediately after they provided service to the notebook.
Alternately, you can call our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the following link to get the support number for your region: Phone Assist Worldwide.
Thanks!
Please click the "Kudos, Thumbs Up" at the bottom of this post if you want to say "Thanks" for helping!
Please click "Accept as Solution" if you feel my post solved your issue, it will help others find the solution.
The Great Deku Tree
I work on behalf of HP.

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