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Sony Xperia Z4 (known as Sony Xperia Z3+ in Europe). Smartphone with 5.20-inch 1080x1920 display powered by 1.5GHz processor alongside 3GB RAM and 20.7-megapixel rear camera. It was released in 2014.

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Contacts on the back panel (battery cover) of the Xperia Z3+/Z4

I opened the back panel of my Z3+/Z4 to replace the battery, which was easy enough. I wanted to also replace the back panel (already bought one), but realized the new back panel/housing I have does not have those two copper(?) contacts on the upper right side of the back panel (when you’re facing it). They look like they align with a couple contacts on the inside of the device. My device turns on now and the battery is fine, but I’m currently still using the old back panel without any adhesive (a case is holding the phone together). What are those copper contacts on the back panel? Are they important, or could I just use my new back panel that doesn’t have those contacts? (Some devices from the older Z lineup don’t have those contacts, based on the teardowns I’ve watched.)

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This is the NFC chip.

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Thank you for the answer. I don't use NFC on this device -- does this mean I can just install my new back panel without the NFC chip and my device won't be affected (other than the NFC will not function)?

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Yes, your device should function normally otherwise :)

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Hi Jonah, I ended up carefully tearing off the NFC chip from the old panel, then placed it on the new panel. I also tore off the flash lens from the old panel to the new panel because it looked magnifying (while the flash lens in my new panel was a flat piece of circular plastic). I have just finished installing the new back panel with the old (and now possibly broken) NFC chip and old flash lens. My old Xperia Z4 has a new life! Thanks for the help, guys!

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Philip Alegrado estará eternamente agradecido.
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