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I second that note about installing a new CPU. It is VERY hard to put it back undamaged and I too got mine bent.
The way I managed to do it was working sort of upside down: left the board on the desk then sat on the floor to screw the GPU bracket in place first then one side of the CPU bracket one-handed whilst using the other and to make sure the heatsink wouldn’t move and F my CPU again. Only then I flipped the board to attach the other screws which was extra hard as that spring is very strong.
Didnt know about that issue replacing a i5 with a i7 though… saw several guides online where people did exactly that with no problems at all…
If like me you’re upgrading the CPU - or maybe just reapplying thermal paste - you’re in for a treat when you try to reinstall the heatsink…
That spring is very strong and you’ll have to flip the board to put it back. BUT that might shift the CPU out of place and when you do apply force to secure the spring you might bent or break the CPU depending on how much it shifted.
Mine got bent (took me hours to troubleshoot) and I was lucky to unbent with no damage.
What I recommend is to secure the GPU screws first - go all the way! - and then proceed with the CPU. Still be very careful and if it doesn’t feel right just stop take everything apart and do over. Better safe than throw hundreds of dollars worth of CPU in the trash…
My model (2015) had another screw holding the heatsink duct and a stand-off holding the whole thing attached to the back. Even gently moving the logic board almost got the duct damaged till I realised what was going on so I’d suggest to be careful and DO NOT pull the logic board if it looks like it’s still attached - most likely it is!
First impressions so far: yes it can be a bit nerve wrecking if it is your first time doing this sort of thing and even with lots of experience with a 2011 model it’s still a bit unsettling haha (nervous laughter).
What I recommend: use a guitar pick to start cutting the glue. You’ll need a bit of pressure so do just the tip.
Once you’ve done the whole perimeter (minus bottom) do it again but now it should be easier to go deeper so go very slow and careful. Then get the old suction cups used to open older models and start lifting the display very carefully to see where it’s still glued and cut those as well.
Then you should be done and now the real fun begins! :D
When reassembling you might want to remember to reconnect the battery cable BEFORE tightening the logic board in place.
Same goes for the cable from the power supply.
Both can be done afterwards but it's a pain, better done before securing the board in place.
You assumed the person who got to this stage had already pulled the display off.
It has to be noted that you need to take of the display before removing the heatsink or you just won't be able to.
There are 2 screws holding the right speaker on place, one of them might be 'hiding' underneath a tiny board that seems to be a sensor (ambient light sensor?).
Very important to note that you must remove that tiny board too.
When reasembling the heatsink you should pay attention to see if it really is touching the processor and videocard chips or you might end up with dangerous overheating glitches. I had to bend mine a little AND use some tape to keep it bent so it would touch the videocard chip - and it took me LOT'S OF HOURS tearing it up and reasembling it back until I realize that was the culprit of the glitches I was getting...
It is much, MUCH easier if you take out the screen before messing around with the logic board. On the way back is also easier if you put the logic board before the screen.