I was actually just testing this last night as i own a repair business.
iphone 7 and iphone 8 both original screens .
my way of testing iphone 7 screens (mine all use the original apple lcd and touchscreen) is to attach the screen only , no front camera or home button. It will appear to boot loop but it takes 4 mins 10 seconds to get eventually to home screen . During some of this time i use it to check for any visual defects on LCD.
now my findings were the iphone 8 screen booted up in the same time 4 mins 10 seconds on the iphone 7. LCD fine but touchscreen not working at all.
HOWEVER........ it has only came to light that ios 11.3 is preventing iphone 8 users that have had a COPY screen on their iphone 8 now have no touch. Copy screens worked fine on previous ios.
i am wondering if the iphone 8 touchscreen would work on my iphone 7 if the 7 did not currently have ios 11.3 installed . I would bet my bottom dollar the touchscreen would operate as normal.
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I work for a phone repair shop, and can confirm that I have gotten an iPhone 7 Plus screen to work on an iPhone 8 Plus by trimming the plastic tabs at the top of the screen and using the adhesive that comes with the screen. There were no issues. The iPhone 8 Plus booted up and works perfectly fine.
из Anthony Moore
Correct! I have just repaired a friends iPhone 8 screen while he told my it was an iPhone 7 and used an iPhone 7 screen and everything worked fine. Checked the camera, speakers, touch, colours and booting.