Replacing the broken LCD screen in the laptop, but the new LCD screen is not working, that often happen in some cases. What’s the problem?

Now, please make sure that your new LCD screen is compatible with the old one. Different screens require different video cables, so it’s very important whether the new screen is compatible with your laptop.

Then, please check all cable connections again. Check connection between the video cable, LCD screen and inverter board. Reconnect cables just in case. Take a closer look at the connection between the video cable and LCD screen. It’s likely that you accidentally pulled the video cable from the connector during the screen installation.

The video cable need seating properly, all the way down.

Also, on some older LCD screens there are very thin pins inside the connector. Take a look inside the connector, make sure there are no damaged (bent) pins.
You can straighten bent pins with a very small screwdriver but this procedure requires a lot of patience and concentration.

Fortunately, most newer LCDs have a different type of connector, without fragile pins inside.

OK, you have reseated all connectors and cannot see anything wrong but the new screen still is not working. What’s next?

Remove the new screen and connect the old one. If the old one works properly (except the damaged area) but the new one is dead, apparently the new screen is defective and has to be replaced.