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Repair guides and disassembly information for Google's Pixel 4 XL smartphone, released in October of 2019.

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Risk of disassembly of front laser assembly

I need to replace the battery on my Pixel 4 XL. Your guide looks fantastic and helpful. The guide includes a warning about the front laser assembly:

Caution: Google warns that disassembly of the front laser assembly could result in hazardous exposure to invisible infrared laser emissions. Read their safety warnings here.

I don’t see anything in the instructions that would mess with the front laser assembly. What is the risk of accidental disassembly of the front laser assembly?

Thank you.

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If you don't mind me asking, why are you replacing the battery so soon on a device that hasn't even been out for a year?

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Yea I don't mind answering that.

I took my phone into a shallow pool (2 ft) thinking the IP68 rating the phone was marketed for meant something. uBreakiFix, Google's only authorized service provider, turned me away at the door. They weren't willing to look at the phone at all. They said Google Pixel 4 phones are not as water resistant as they claim and they did not have the parts available to perform any repair. They wouldn't even perform any diagnostic service. Meanwhile, the Google Repair Center wants $550 just to look at it.

Yes I'm disappointed about this experience. I think I used the phone reasonably. I had more faith in Google's hardware specifications and support than I should have. Any amount of liquid exposure voided my 1 year limited warranty.

Nonetheless, I think I can follow the instructions on this site to perform the repair myself. I've never opened a phone before, so I want to understand the risks.

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I suspect that your phone's issues are more involved than just a simple battery replacement anyway. Especially if your pool in this incident was salt or chlorine sanitizer based.

From another manufacturer of IP68 phones (Samsung)...

Devices backed by an international standard rating of IP68 are deemed fit enough to withstand dust, dirt and sand, and are resistant to submersion up to a maximum depth of 1.5m underwater for up to thirty minutes.

*Based on test conditions for submersion in up to 1.5 meters of freshwater for up to 30 minutes. Not advised for beach or pool use. Water or dust damage not covered by warranty.

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I agree with you that the phone's issues might be more involved. Again, that's why I am asking the original question.

In the description you pasted about IP68, the manufacturer simultaneously makes claims about specific capabilities of the phone and takes no responsibility for those claims.

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The IP68 comments from Samsung and the laser stuff from Google are all liability speak from their respective lawyer teams. You have nothing to lose at this point I suspect and the battery replacement procedure doesn’t even remove the laser elements in question. If you are paranoid about exposure to laser light you can cover the emitter if you need to run open case tests before completing reassembly. Having said that, I think the moderate difficulty level on this is pretty relative. Looks pretty hard to me, especially keeping up with multiple lengths of screws and making sure to put them back in the correct cavities. Good luck sir.

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