"I don't think anyone has even thought about doing this... The AW3's screen is brighter than the AW2's!
As the AW3 is so new you should try to get it covered under warranty (get AppleCare + if you don't already).
Update (01/31/2018)
@quekilombo - Diego - The NFC unit is missing on the Series 3 display so you would need to recover the chip from the broken Series 2 display if you could to then re-solder onto the new display to get this to work. Given the sensitivity of the LCD unit and the mass of the glass this will be very difficult to do without damaging the display. Here's the back side so you can see the difference:
Series 2
Series 3
The Blue outline is the NFC chip and the spot on the Series 3 is vacant. I think I understand why Apple did this as replacing a broken display would invalidate the information in the watch when people had ApplePay enabled. Having it as part of the main board makes sense."
Just replaced a screen on a series 3 LTE. I used a donor screen from a locked Series 3 LTE. Everything went off without a hitch. However, I can confirm Apple pay does not work. I get an error when attempting to set it up. I have not yet attempted to swap the NFC chip. I will attempt to see if I can remove the NFC chip tomorrow from the cracked screen and install... If anyone has any further information about this I would be happy to hear it...
"I have successfully swapped a S2 Display onto a S3 Watch.
I removed the Light Sensor / NFC Module from the damaged S3 Display and attached it to a working S2 Display. I used conductive ink to make electrical connection to the two antenna points under the module, and superglue to mechanically attach the Module. Next I reflashed the Watch firmware using a (non-Apple) hardware device similar to the one used at the Apple Genius Bar.
I verified NFC functionality by setting up Apple Pay on the Watch, double-tapping the Side Button to activate Apple Pay as though I were about to make a purchase, and reading the ""tag"" data with an app called ""CardTest"" on an Android phone.
I have recently changed my broken lte series 3 watch with a series 3 gps watch. The force touch was not damaged. The Apple Pay won’t work, was it confirmed that the chip was on the old lcd? If not is there a way of getting it to work again?"
