When I plug my phone into my laptop and it is closed, it will charge fine. When I open my laptop, however, the phone will stop charging. This is on a trusted laptop and it happens even when the phone is unlocked. This may be the wrong website, but I’m desperate here. 3 hours of my life are wasted because of this issue. ( no typo, charges in sleep and DOESNT charge when open)
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The reason behind this is, that the laptops circuitry diverts all the ampere from the USB back to the main CPU when the lid is open (back from standby mode).
If however, you laptop has a USB3.0 port, then there shouldn’t be a problem as these 3.0 ports can deliver upto 1.25 amps enough to power or charge any iPhone on the market.
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You may want to add the laptop model you're trying to charge your iPhone with, it would help putting things more in focus.
por arbaman