[Q] USB charging of WiFi model

[Apo11on]

I tried the cord that came with the tablet, and my other USB cables - same results with all. My Note Pro won't charge via USB at all - when I plug it in battery status says "not charging" and it keeps discharging, while idling with screen off. Only AC adapter works and battery status changes to "charging". Any ideas?

 

[Serinety]

You can't charge the tablet off s usb port. Draws too much current. Some motherboards have an option to turn on a special charging function for a usb port, but if you had that you would probably know.

Your stuck with the wall charger.


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[Apo11on]

You can't charge the tablet off s usb port. Draws too much current. Some motherboards have an option to turn on a special charging function for a usb port, but if you had that you would probably know.

Your stuck with the wall charger.


Sent from my HTC6435LVW using Tapatalk

Besides Not Pro I've had Sony Xperia Tablet Z for a year now - it charges from USB just fine. I never use AC charger with it...

 

[muzzy996]

Besides Not Pro I've had Sony Xperia Tablet Z for a year now - it charges from USB just fine. I never use AC charger with it...

Stock kernel on the Xperia Tab Z must have USB charging enabled. This is an exception rather than a norm I would think, with OEMs probably choosing to disable this as a safety measure (or so i've read).

Until a custom kernel is developed for the Note Pro we'll probably not see charging over USB.

 

[Serinety]

The problem is still the max output from the USB port, which is 5V 0.5A , you'll notice that the charger for the this tablet is 5.3V 2A.

I'm an electrical engineer not a computer engineer, so I'm not sure how a kernel would change the max output current supplied by the PC. This has actually piqued my interest, I'm going to do some tests and see how much current the port can push. I'm betting the data lines on the plug send some information about what's being charged.

Maybe I'll build an adapter that that let's the tab pull a full 2A from the port.

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[Apo11on]

Does it make a difference if it's USB 2.0 or USB 3.0 port?

 

[dodo99x]

Normal USB 2.0 is 500mv, USB 3.0 is 900mv. Some motherboards can push this up to 2000mv, usually a red usb port

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[muzzy996]

The nature of my kernel comment stems from my Nexus 4 experience with a custom kernel which has a setting to enable usb fast charge (Franco kernel with his FKU application).

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[Apo11on]

This review says Note Pro 12.2 can be charged via USB - it's just slow. As I mentioned in the OP - when I plug it in via USB cable the battery status says "not charging" - could it be it's actually charging, but due to low current the device itself doesn't recognize it's being charged?

 

[dodo99x]

Just plug it in for a few hours and see if it increased your battery level... done.

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[Apo11on]

Just plug it in for a few hours and see if it increased your battery level... done.

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It kinda works - with tablet completely idle and screen off it charged about 4% in 1.5 hours via USB 3.0....don't think that's helpful to anybody. Hopefully, someone finds a way to push more current through USB 3.0 port. Would be nice to eliminate the need to use AC charger.

 

[ShadowLea]

I had mine hooked up to my laptop (Asus N76VB), it didn't charge according to the indicators (neither do my TabPro 8.4, Tab 3 and Tab 2, nor my TF700T), but the battery didn't drain either while I was using it. It stayed at 56% for 5 hours whilst browsing, which it really wouldn't do normally. USB 3.0, no additional settings enabled on the laptop, all Sync and GPS turned off on the tablet.

My TF700T literally said in the manual: "Charging from USB can only be done with the device turned off." I'm sure that applies to these tablets as well.

On the upside, my 15600mAh aSolar powerpack charges the device! :victory: (It can't charge my Tab 2 or TF700). I'm really, really pleased about that!