The fan he replaced is easily accessible from the back, not the front. The cover was never removed . I replaced the main board from the back also. It’s very easy to get to by just removing one plate.
The upper cover lock switches were the first things I checked, holding them down.
It’s strange that the close cover error only appeared after I changed the board. I removed all the wires and the five ribbon cables and reinserted carefully three times. I know they are in the proper slots on the board because I took close up pictures of them all and marked each with tape which I numbered on both the old board and each wire.
I found the diagram where that cover sensor goes into the main board and double checked it.
It’s a mystery. After looking at all these millions of tiny plastic parts and circuits in the diagrams I’m shocked these things work at all, much less eight years of weekly use.
I’ve read online about other people having this error and it had nothing to do with the cover itself. I have no idea.
John
quote author=arobinson7547 link=topic=137847.msg1211014#msg1211014 date=1615065516]
If when working on it, he didn't put the switch back.
Try putting a piece of cardboard/heavy paper in the whole where the switch is and see it it activates it.
There be two; you can always check the underside of the lid to look for the pieces that rest in the switch hole(s) and triggers the lid being closed.
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