A1466 MacBook Air Display Assembly Replacement almost succeeds

We can presume the display assembly replacement is working fine and you have no issues on the display right? Your problem now is regarding the battery health and the I/0 Cable in step 5 or the power cable in step 11? The power cable should slide into the socket and gently push it all the way, forcing it may have bent or broken off some pins so a closer look at this will confirm if the pins in the connector got bent or even totally wasted, as for the black plastic I/O cable in step 5. if this was the one you said you had to 'force' onto the board then it is likely that the cable or the connector itself has been wrecked. If you can zoom in on the connection socket on the board, is the gold colored frame still there surrounding the connector or is it all bent up or even missing as this will cause the cable to be difficult to connect properly thus affecting somethings. Check also the cable itself, did it get very bent up in removal or installation? Is the connector on it also damaged? These things are quite delicate and should never be forced or pushed to connect with to much pressure, they should slide or clip in relatively easily. It would be a good idea to put a screenshot of the coconutBattery info with the charger connected and one without the charger connected so we can see whats reported, and also images of the I/O board connector and board connector. Also review if the battery is fully connected and there has been no damage on the board connector there.

I wanted to also ask a separate question on this as if the gold frame on the I/O board side connector is away, will it affect anything as I have an I/O board here that this has happened to.... ?