I think a wiring is bad because my screen is flickering

ever since i changed my battery on my laptop my screen started flickering. its not a gpu problem because it doesnt happen when i plug in an hdmi. sometimes it stopes when i close the laptop and reopen it or other times when i take the laptop screen back. this lead me to think it is a wiring issue. the only problem is im not sure which wire im supposed to change or readjust.