Are You Drawing A Lot Of Power?

Phone or tablet will not charge

I just received my tablet, and I notice that I cannot charge it when I connect to computer. Charging a device depends on how much power it needs and how much your computers USB port can supply. If the Port is too weak it will never charge well. It might be a little better when your tablet is turned off?

Try another port or computer? And actually, they may get some charge from the computer but it may be too low to actually trigger displaying that. Tablets are massive power draining devices and all USB ports cant give the same voltage , my laptop especially could never charge a decent phone.

I always use the mains socket which is more reliable for charging. I just spotted bug for this.

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Looks like it gets updated on device startup only. Now I have my tablet I see the supplied charger can provide 2 Amp. Nuff said. Atleast the 2. Tablets have larger batteries than phones and may be unable to sufficiently charge from the half amp limit of a USB port, especially while they are fully on screen on and full speed processor clock. Some will barely charge if the screen is off but come with high current 5v "usb-like" wall chargers, others use a higher voltage charger on a custom connector - typically something round.

Why won't my Samsung Galaxy Tab 2 charge?

Sometimes the "usb-like" ones are actually special cables with extra pins that tell the tablet that a special high-current charger is being used. If you are able to install custom ROMs you will probably get fast-charge-support, with this activated your tab will even charge over USB, but it will take much more time than with the AC-power-adaptor.

This way it charges, and shows charging, it just takes time because the power available on USB is limited. If this is the case, the battery will eventually run out. Your mileage will also vary depending on the USB port, as different USB cards can supply different power levels the default spec is less than what the GT-P usually draws; though nobody to blame here.

If I turn the screen off it will actually recharge, although slower than with the Samsung wall-plug.

But after a couple of hours much longer than with the charger , it is full charged. Over at the Apple sister site there is an explanation why the iPad displays not charging ; I guess this applies to Android devices as well:. If you could see the screen while the iPad was asleep, it might even display the charging icon. There is another answer that explains why charging is slower on a computers USB port than when connected to the charger itself. I don't think it's only because of max current problem. But failed to have a symbol charging. Like other laptop batteries whatever.

Samsung Galaxy Tab A SM-T580 No Power, Not Charging

It means samsung doesn't want users to use their cheap and plentiful ones as spare at home. The problem is the device is looking for specific resistance on certain pins. Without these the tablet won't try and draw the full power. Problem is the cable. AWG28, the resistance in the cable is so high that the voltage will drop under 4V on the other end of the cable.

You should also buy a short cable, so the resistance won't be so high. The gauge AWGxx tells the copper wire's diameter.

We will see you soon!

Other possibility is, that you buy a 2A charger with 6V voltage. By that way you may charge you application by 5V and 2A current even through a cheap usb cable.


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I've solved the problem of using other chargers with GT. Like Apple, Samsung used a little trick with their chargers. To charge your GT with any usb charger you have to make a little adapter. I tested it and it's working. If you want to charge your Tabs,then simply switch off your tab and connect data cable. Thank you for your interest in this question. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site the association bonus does not count. Would you like to answer one of these unanswered questions instead?

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