If you disconnected the displays cables these last LEDs won’t light up. If you are lucky to have the service cable extensions you can have the display to the side with lots of access. Without the cable extensions you need to be careful not to pull on them as you can damage the logic board LVDS connector.
Can you post some pictures of the logic board connector so we can check it out. Need a set of sharp and tight images looking into the mouth of the connector as well as the side a bit.