Noticed recently the appearance of a white screen at the time of work on the laptop HP Pavilion dv7.
When switching to an external monitor and back by a combination with the Fn key, the image was displayed normally, but after a while the problem appeared again.
The main reason for this phenomenon is likely to be a damaged or poor contact on the plume going to the display.
In my case, its disconnection/connection did not solve the problem, I had to order it on Aliexpress, it’s not expensive there.
Under the battery is written the full name of the laptop model for which you need to order a cable.
After replacing the loop, the problem was solved.