Welps, I tried to do a transplant using my Fold4 as the inner screen donor and failed. I picked up a Fold4 from eBay for $220 that had a broken inner screen but everything else healthy and OS working and bootable. The plan was to replace the broken inner screen with the presumably working one from my old Fold4.
I learned a lot throughout the 6-hour operation, chiefly that it's not really worth my time to try this again (even if i know where everything goes now and have improved my technique and speed). We are all at different stages of our lives and in my twenties I definitely had more time than money, but I have an established career and family now and this was not worth a wasted half-Sunday. For anyone else contemplating this, just pay the $550 repair bill or pony up $840 for a fully working Fold5 from Swappa...or better yet, always have insurance on a foldable.
I needed less than $20 in tools, mainly .10mm screen separators, tweezers, and tiny Phillips screwdriver set to take everything apart. The rest was an exercise in patience, organization, and technique.
What sucks is the three ribbons behind the inner screen are buried behind everything so you literally have to disassemble most of the phone except for the batteries and hinge. It took me two hours just to remove the back plate and front screen without breaking it. Later, my technique improved and I was able to remove the front screen and back plate on the second phone in only 30 minutes.
The inner screen was already broken on the eBay phone so that allowed me to learn a few things, mainly that I severed the ribbon cables while trying to remove the eBay inner screen. Learning from my mistake I managed not to cut any ribbons on my donor phone, however I still managed to accidentally separate the layers of the inner screen because I didn't get the thin pry tool deep enough behind the actual display -- what can I say, it was hard to see and feel for the thickness of the screen.
Oopsie...
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In the end, the eBay Fold4 inner screen still doesn't work and worst the front cover screen now shows a white line down the left side:
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I also learned you can't expect every Fold4 to be the same as some circuit boards have additional pin outs whereas others have outlines for placeholders on the board. If you needed to swap out that particular board then they wouldn't be compatible:
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In the end, if everything worked out as hoped then I would've saved a net $300 versus the repair bill at a local shop but honestly I make enough now that my time is more valuable than the potential savings. Lucky me now has two non-working Fold4, lol. Well, one sort of works except for the inner screen.
Hope this experience convinces the next person to buy insurance for their foldable, it really is the cheapest (in time and money) and the easiest path. At least now I'm not afraid to crack open any phone, I just prefer not to.
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