Having just finished replacing my TH board I can confirm the wiki is lacking clarity and many pictures are of poor quality.
My suggestions if you’re going through this.
Read all the wikis related to tool head disassembly, th board replacement, eddy nozzle replacement, camera replacement and heating element replacement. You’ll want to compile your own set of instructions by piecing these together as some have much clear and better exposed pictures vs others.
You’ll also want to be able to swap the printer back and forth between being on a short table and being on the floor. Ridiculous I know but there are times where you simply cannot get a clear view of things unless you literally lay wit your head inside the chamber looking up.
Light light light. As mentioned by others these connectors are small and fiddly. Some have excess slack, same are perfect length and some are very tight.
Three of the connectors are an uncommon, in my experience, snap down type of connector vs typical push in/pull out. The instructions do mention it and show a diagram but to be honest it wasn’t clicking with me as I’ve never seen this style before. And for the record I’ve repaired countless pcs, televisions etc for many years. When removing pull the wire perpendicular to the board/connector and when installing be sure that the brass terminals are visible side up. If you try to pull the connector out parallel to the board you will pull the wires out of the connector….trust me.
Also as mentioned there are many different sizes and types of screws used inside the tool head assembly with some only a fraction of a mm different from others. Create yourself a little grid or container with labels for each. Also some of the wiki instructions show pics of the screws used, some don’t, some tell you the size, others don’t. Again if you piece together the various wikis you’ll find some of this information, but not alll. I was fortunate in that I had a 2nd printer for reference. Bambu should update the wikis with this information
Last thing, if I had to do it all again I’d likely just remove the whole x assembly so that I could repair it on a bench. The lack of visibility makes this type of repair difficult and more tedious than you would expect.
I will say that after having gone through this and assembled / disassembled various pieces of the tool head it would be infinitely easier next time using the above notes. All of the printed wikis I pieced together plus pics I took myself as I went helped me.
Good luck