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For Professionals: Always disconnect battery before repair?

I've been fixing iPhone for a couple of years now and I always shut the phone down before repair but I usually never disconnect the battery. Would it be smart to disconnect it before every screen replacement?

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I've never had any issue, and I've been doing it for years. I've even done it a fair few times forgetting to power the device off and it's been fine.

But I would always highly recommend removing any source of power. :-)

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absolutely 100% yes. no doubt about it.

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I would second disconnecting the battery. While you will probably be fine in most cases, do you really want to risk damaging the device, by skipping a step that takes a few seconds.

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