Does the MK808B suffer random Reboots/Freezes like the Imito MX1 ?

[magnemann]

I cant run antutu with the stock power suply, usb hd, keyboard and mouse plugged in a usb hub. Mine gots reboots and freezes, sometimes nand corrupted and reflash needed, I tested the output power suply amperage and the maximum. Amount in the tester was 1,2A. I changed the stock power suply for a psvita power suply. I saw 1,8A testing same things plugged. It never freezes or reboot again, thats why I suggest to changue it if you have stability issues.

Sounds sane what youre saying. How did you test max amp.? I dont know how to test, I dont have devices using that high amp.

[leolas]

Sounds sane what youre saying. How did you test max amp.? I dont know how to test, I dont have devices using that high amp.

easy, you need a USB cable, you have to peel it, cut one of the wires feeding normally the black or red wire, at the ends of the cut wire put in place a DC amperage meter, so you can see the instantaneous consumption of the stick. When you put a program like AnTuTu function, see as consumption rises immediately. The most that I saw while doing the tests was 1.8 A, with hight cpu load, usb hd, mouse and keyboard plugged.

Sorry about my english, i hope you undrestand it, is dificult to me explain it in english.

[magnemann]

easy, you need a USB cable, you have to peel it, cut one of the wires feeding normally the black or red wire, at the ends of the cut wire put in place a DC amperage meter, so you can see the instantaneous consumption of the stick. When you put a program like AnTuTu function, see as consumption rises immediately. The most that I saw while doing the tests was 1.8 A, with hight cpu load, usb hd, mouse and keyboard plugged.

Sorry about my english, i hope you undrestand it, is dificult to me explain it in english.

Ah, now I understand. I was confused for a moment. I measured Ampere on the 'wrong' side of the usb charger. Watt = Ampere * Volt. You measured 1,8A*5V=9W. I did 6W=0,03A*227V.

I thought of buying a DC amperage meter anyway, then i can measure. It would also be interesting to see if voltage drops occur randomly or with heavy usage on a 'bad' usb charger. I suspect voltage drops causes instability. Thanks, man.

[leolas]

Re: Does the MK808B suffer random Reboots/Freezes like the Imito MX1 ?

I only have one multimetter so I can't see if voltage drops in hight load, but I suspect it, some manufacturers are so much optimistic with the maximum amperage that theirs power suply can give, instability issues are usually caused by power Supplies, insufficient heat disipation or defective hardware, I allways try to solve heat and power, usually it works.

[magnemann]

Hi again, leolas!

I tried your method of testing ampere usage from the power supply. I also tested voltage usage by tapping into red and black wire in the usb cable.

max current usage I got during this setup:

mk808b, usb on, bt on, bt headset connected, 1416MHz performance governor, RC11 keyboard/fly-mouse connected directly into usb on mk808b. No other devices connected, no usb hub, Antutu running 3d graphics.

I tested with two different power supply:

1: 2A, shipped/bundeled with my mk808b. Using this, the mk808b has been very unstable.
max current:1,2A. voltage minimum: 5,03V voltage maximum:5,32V. During the test i suddenly discovered that USB PORT in the charger IS BAD QUALITY! When i wiggle the cable i suddenly loose power. I have to bend the cable slightly to the side for it to work. The devil is for sure in the details.

2: Apple charger, 2,4A. Tried it just a few hours, stable so far. max current:1,2A. voltage minimum: 4,81 voltage maximum:5,09V. A bit lower voltage than charger 1.

Does anyone know what is healthy voltage range for the mk808b?

[leolas]

Re: Does the MK808B suffer random Reboots/Freezes like the Imito MX1 ?

Good test, if you can try to use some usb hd for more little load and you will see how stock power suply comes down. In my power suply 1,2A was the maximum amperage that it gives. While with the psvita power suply, (only said that one cause is cheap, easy to find in all places and good enought, any good power suply should work) I saw 1,8A with the same plugged.

I dont know voltaje range, but I think 4,81V must be enought, I didnt check voltaje drop. But maybe your 2,4A power suply is not good enought. Like I said before if you plug only the stick, the stock power suply must be enought, if you plug more items, like usb hd, the stock one will not be enought.
Is the iPad power suply original? Chinese manufacturer are so optimistic with their wattage power supplies.

[PoisonWolf]

Good test, if you can try to use some usb hd for more little load and you will see how stock power suply comes down. In my power suply 1,2A was the maximum amperage that it gives. While with the psvita power suply, (only said that one cause is cheap, easy to find in all places and good enought, any good power suply should work) I saw 1,8A with the same plugged.

I dont know voltaje range, but I think 4,81V must be enought, I didnt check voltaje drop. But maybe your 2,4A power suply is not good enought. Like I said before if you plug only the stick, the stock power suply must be enought, if you plug more items, like usb hd, the stock one will not be enought.
Is the iPad power suply original? Chinese manufacturer are so optimistic with their wattage power supplies.

Hi Leolas,

I'm going to be receiving a MK808 soon. In anticipation of the unit, I've already ordered a PS Vita charger from Amazon. One thing I'm confused now is that the USB port of the charger appears to only be able to accept the original PS Vita Cable. How did you fit a regular USB cable into the port? There appears to be some sort of sliding lip mechanism that disallows just about any regular usb cable to "fit" into the hole.

Also, I've noted that the PS Vita charger only reads 1.5 amps on the adaptor. Does yours read 1.8 amps?

Any ideas?

Thanks.

[leolas]

Re: Does the MK808B suffer random Reboots/Freezes like the Imito MX1 ?

Hi Leolas,

I'm going to be receiving a MK808 soon. In anticipation of the unit, I've already ordered a PS Vita charger from Amazon. One thing I'm confused now is that the USB port of the charger appears to only be able to accept the original PS Vita Cable. How did you fit a regular USB cable into the port? There appears to be some sort of sliding lip mechanism that disallows just about any regular usb cable to "fit" into the hole.

Also, I've noted that the PS Vita charger only reads 1.5 amps on the adaptor. Does yours read 1.8 amps?

Any ideas?

Thanks.

You need to break the plastics. You can do easy with a "dremel??" I dont know the world of the toolin english. Here I send u a photo I found in internet.
And yes, it reads only 1,5 but i see 1,8A without so many heat in it, while the stock one cant got more than 1,2A and getting hot.

[PoisonWolf]

You need to break the plastics. You can do easy with a "dremel??" I dont know the world of the toolin english. Here I send u a photo I found in internet.
And yes, it reads only 1,5 but i see 1,8A without so many heat in it, while the stock one cant got more than 1,2A and getting hot.

Thanks Leolas!

Do you mean a tool like this?

[leolas]

Re: Does the MK808B suffer random Reboots/Freezes like the Imito MX1 ?

Yes it is.

[PoisonWolf]

Yes it is.

Surprisingly Leolas, I've been stress testing my recently acquired MK808 as of today. I've been running a 4gb file, streamed over the network via the eHomeMediaCenter software and it is not even stuttering with the stock power supply and there are no reboots whatsoever. WIFI signal is also full-bars at about 12 feet from the router. =)

I am afraid however....of these chinese power supplies catching fire....

[marblema]

DC amp is 1.2A

Now I've tested with a 'energy meter'. Its a digital device put between the AC wall and the usb power supply.

I've tested with my mk808b, wifi on, bt off, rc11 keyboard on, antutu bench running, no other usb devices. fresh finless 1.6.

The energy meter says: 0.03A, 6W, 227V (AC wall). This seems like 'small' values, seems like any usb power supply could power the mk808b.

Something I don't understand here?

Well, anyway, since my device is unstable, i try now another charger and cable...

The energy meter says 6W AC power, assuming there's no energy loss to DC conversion, the DC amp is 6W/5V=1.2A, right?

[lukesan]

The energy meter says 6W AC power, assuming there's no energy loss to DC conversion, the DC amp is 6W/5V=1.2A, right?

Be really careful with those energy meters.

Most of them do not cope well with low power devices.
I own 2 energy meters and both have serious issues with stuff that only pulls a couple of Watts.
A nice example is my clockradio which seems to pull 12 Watt on one meter and 9 on the other.
Now the transformer inside is a 1.5VA one which means it is only capable of delivering approx 1.5 Watt

The best way to measure using that energy meter is using one of those power extension cords with multiple outlets. Then take a conventional lamp, 40, 60 etc Watt will do, turn it on and wait a minute so the reading stabilizes. You will see on the meter that the reading is pretty accurate to a couple of % of that Wattage.
Now add your device to that power extension thing and do the tests. You can simply deduct the power of the lamp.

The other way is like Leolas said to measure the current through the USB cable and multiply that by the Voltage. You must take into account that most switched power supply have a efficiency of about 80%.

Now believe me my MK808 is on 24/7 and I don't feel bad about it.

[PoisonWolf]

Yeah, I've since taken a dremel to the PS Vita charger and my MK808 has been running for about 5+ days now. No issues whatsoever and it's even streaming 4gb files over the local network! =D

For the power pull, it's honestly amazing that it uses less watts than my lights. Lol.

Be really careful with those energy meters.

Most of them do not cope well with low power devices.
I own 2 energy meters and both have serious issues with stuff that only pulls a couple of Watts.
A nice example is my clockradio which seems to pull 12 Watt on one meter and 9 on the other.
Now the transformer inside is a 1.5VA one which means it is only capable of delivering approx 1.5 Watt

The best way to measure using that energy meter is using one of those power extension cords with multiple outlets. Then take a conventional lamp, 40, 60 etc Watt will do, turn it on and wait a minute so the reading stabilizes. You will see on the meter that the reading is pretty accurate to a couple of % of that Wattage.
Now add your device to that power extension thing and do the tests. You can simply deduct the power of the lamp.

The other way is like Leolas said to measure the current through the USB cable and multiply that by the Voltage. You must take into account that most switched power supply have a efficiency of about 80%.

Now believe me my MK808 is on 24/7 and I don't feel bad about it.

[leolas]

Re: Does the MK808B suffer random Reboots/Freezes like the Imito MX1 ?

Yeah, I've since taken a dremel to the PS Vita charger and my MK808 has been running for about 5+ days now. No issues whatsoever and it's even streaming 4gb files over the local network! =D

For the power pull, it's honestly amazing that it uses less watts than my lights. Lol.

Nice