Sure. In the US a warranty on any consumer product does not allow voiding or canceling a warranty due to third party parts or service, unless that same service was available at no ocst from the manufacturer.
This applies to not just normal periodic maintance/replaceable parts, but repairs after accidents, cosmetic upgrades, whatever.
So no, Apple cannot refuse to provide warranty replacement on your defective battery if you previously had the screen replaced with a third party after dropping it, since Apple does not provide free screens for negligance. Of course, if Apple can show that this replacement screen or its installation process is likely the cause of the battery not working, they can refuse to cover fixing the battery under warranty.
The problem here is that John Deere will claim that your bypassing their softwareware protections means you were running the tractor outside its design parameters, and that is why your transmission broke, not because it was defective or originally installed incorrectly by them.
To force them to reimburse you for failing to cover this under warranty you would need to convince the jury that it is more likely that the damage was from a defect or John Deere's incorrect installation than it was from side effect of you bypassing john Deere's software. Yeah, it could be rather tricky to convince them of that. Especially since you would already have had to pay for repairs, which likely means you don't have enough to pay for the lawsuit. (John Deere would need to reimburse your legal costs if you win the suit, but most of your time, aggravation and hassle is not reimbursable, and you need to be able to front the needed money in the first place).
This applies to not just normal periodic maintance/replaceable parts, but repairs after accidents, cosmetic upgrades, whatever.
So no, Apple cannot refuse to provide warranty replacement on your defective battery if you previously had the screen replaced with a third party after dropping it, since Apple does not provide free screens for negligance. Of course, if Apple can show that this replacement screen or its installation process is likely the cause of the battery not working, they can refuse to cover fixing the battery under warranty.
The problem here is that John Deere will claim that your bypassing their softwareware protections means you were running the tractor outside its design parameters, and that is why your transmission broke, not because it was defective or originally installed incorrectly by them.
To force them to reimburse you for failing to cover this under warranty you would need to convince the jury that it is more likely that the damage was from a defect or John Deere's incorrect installation than it was from side effect of you bypassing john Deere's software. Yeah, it could be rather tricky to convince them of that. Especially since you would already have had to pay for repairs, which likely means you don't have enough to pay for the lawsuit. (John Deere would need to reimburse your legal costs if you win the suit, but most of your time, aggravation and hassle is not reimbursable, and you need to be able to front the needed money in the first place).