Power over USB

Forum to discuss the Rikomagic MK802 Mini PC

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Power over USB

Postby karluqs » Fri Jul 27, 2012 8:01 pm

Hi,

It's safe to use the mk802 powered over USB port instead of the power adapter?

I know that a USB port can provide 4.5 ~ 5.5, which it's enough (power adapter provides 5v), but the problem is the mAh (amperes), a good USB port provides 500mAh at most, is this enough for mk802? The power adapter provides 2000mAh.

Is there any other concerns about this? My plan is to keep the mk802 powered over the usb of my TV, so when i turned it on/off the mk802 will turn in/off too.
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Re: Power over USB

Postby Tatanko » Fri Jul 27, 2012 11:02 pm

Yes, it can be powered by USB. Specifically the mini USB port (labeled OTG), not the full-sized USB port. It's the same port used for connecting it to a PC. It has also been used for power on the lapdocks people are playing around with.
MK802+
--Rev.2 firmware (4.0.4), 1GB RAM, a few tweaks...
Late '11 Macbook Pro 15"
--OS X 10.8.3, 2.4 GHz, 1GB graphics, 16GB RAM, high-res screen
iPhone 5
--iOS 6.1.2 jailbroken, 16GB storage
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Re: Power over USB

Postby EnvyThisStuff » Sat Jul 28, 2012 10:39 pm

Both ports can power it. However read from here http://www.envythisstuff.com/techtalk/m ... uttingdown
Run into a problem? Need ***Mini PC/MK802 services***?
(installing firmware, installing LINUX, getting/setting up SD cards, etc)
Contact us! http://www.EnvyThisStuff.com
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Re: Power over USB

Postby krankdroid » Sun Jul 29, 2012 5:02 am

I have mine powered by my tv's usb port, so that when i turn off the tv it turns off as well.. However, it powers itself back on during the night for some reason, with the tv still turned off. Can't really figure out why.
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Re: Power over USB

Postby chesterx » Sun Jul 29, 2012 5:31 am

Interesting that mine won't start when powerer by usb. It starts to turn on but at some point drops out and tries again. Quite a little loop. Plugged in ac adapter and she boots right up. I must point out that the supplied usb was coming off of a ps3. Just not enough umph.
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Re: Power over USB

Postby Tatanko » Sun Jul 29, 2012 5:51 am

chesterx wrote:I must point out that the supplied usb was coming off of a ps3. Just not enough umph.

That's strange, considering the PS3's USB ports are used to recharge the controllers. Weird.
MK802+
--Rev.2 firmware (4.0.4), 1GB RAM, a few tweaks...
Late '11 Macbook Pro 15"
--OS X 10.8.3, 2.4 GHz, 1GB graphics, 16GB RAM, high-res screen
iPhone 5
--iOS 6.1.2 jailbroken, 16GB storage
Tatanko
 
Posts: 48
Joined: Thu Jul 19, 2012 6:58 am
Location: Pennsylvania, USA

Re: Power over USB

Postby Mylt1 » Sun Jul 29, 2012 6:17 am

Tatanko wrote:
chesterx wrote:I must point out that the supplied usb was coming off of a ps3. Just not enough umph.

That's strange, considering the PS3's USB ports are used to recharge the controllers. Weird.

recharging batteries is different then trying to power something. i would imagine it has the voltage but not the amperage to run the 802.
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Re: Power over USB

Postby chesterx » Sun Jul 29, 2012 7:14 am

Yes charging batteries is current limited. There is no way the usb has enough current output. Batteries are very slowly brought back to nominal voltage. This allows for a much smaller power source and it increases battery life by reducing temperature.
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Re: Power over USB

Postby batrarobin » Sun Jul 29, 2012 2:07 pm

I have tried powering it up thru my samsung LED TV USB port, however whenever I do so, there are issues with blanking, or sometimes it restarts etc.... But when I connect it thru its power adapter, it works fine, so I am presuming, my samsung USB port is unable to provide enough milli-amperes to mk802
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Re: Power over USB

Postby atok » Sun Jul 29, 2012 3:42 pm

Are there any specs available about MK802 power consumption ?
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