Power via USB Power port (is this all we need?)

[smithmal]

A friend of mine also has the CX-919 and is using it with a TV that has a USB port. By using the USB power port to power the stick (i.e. the side microUSB port), I'm assuming he's only getting a maximum of 500mA of power. He has noted no crashes with the stock firmware and is running XBMC 12.2 without issue when streaming 720P vids.

When flashing new software, I've also had my stick powered by USB (although it is through the back microUSB OTG port rather than the side microUSB power port) and have run across no issues while updating apps etc. I'm wondering what processes necessitate this stick needing 2A of power (which in reality is what large power hungry tablets like the IPad use to power/recharge and run IPS or retina screens)? Why would this stick which has no screen and no rechargeable battery need 2A of power to function?

Personally, I've noted whole OS reboots/crashes regardless of whether I was on the stock firmware or the new Finless ROM (albeit much less with the Finless ROM). I'm thinking that the stock charger doesn't do such a great job of regulating power which may be why I'm seeing crashes. With USB, power should/may be regulated much better than with the stock charger which would equate to better overall stability.

Also, if using only USB power, the stick should not get nearly as warm since it's not pulling 2A of power. Can anyone else verify if they are using USB alone to power their CX-919 and what their experience is?

smithmal

[planetmarklar]

I used the USB port of an LG tv, brand new and the stick rebooted 5 min into the movie, plugged it into the wall and no more reboot. The 2A of power is for powering other things like external hd,mouse and keyboard etc from what I understand.

[smithmal]

I used the USB port of an LG tv, brand new and the stick rebooted 5 min into the movie, plugged it into the wall and no more reboot. The 2A of power is for powering other things like external hd,mouse and keyboard etc from what I understand.

Thanks for the reply. I'm going to try some benchmarking tests while plugged into USB and note stability. I'll also do some XBMC tests and let everyone know what I find. Should be interesting...

smithmal

[Hotabych]

Is any one also tried to supply power to CX919 by Tv`s USB?

[elinx]

Is any one also tried to supply power to CX919 by Tv`s USB?

After reading this I have give this a try too.
I have an Samsung TV and a Tronsmart CX919 (Nexus multi rom and 1080p stock kernel).
The Android device was playing some movies for a couple of hours without a single error.
Playing TV channels >>> Android TV sleeps.
TV standby >>> Android TV shut down.
The CX 919 with the Nexus Rom was already acceptable warm with the powersupply, but with TV USB power it becomes less warmer as before.
I am satisfied and will try this combination for a longer time.

[MARIANOTE]

After reading this I have give this a try too.
I have an Samsung TV and a Tronsmart CX919 (Nexus multi rom and 1080p stock kernel).
The Android device was playing some movies for a couple of hours without a single error.
Playing TV channels >>> Android TV sleeps.
TV standby >>> Android TV shut down.
The CX 919 with the Nexus Rom was already acceptable warm with the powersupply, but with TV USB power it becomes less warmer as before.
I am satisfied and will try this combination for a longer time.

Keep trying and tell us
i think ( because a read a lot in other forums about that) usb power supply is sufficient but in "hard use" cant be..
can be a good thing to know how much amps usb tv gives... cx919 needs 2 amps
regards

[elinx]

Keep trying and tell us
.....
can be a good thing to know how much amps usb tv gives... cx919 needs 2 amps
regards

I have search the Samsung manual, but the USB is only used for updating the firmware by USB stick.
No specification of max. current is given.

I can't believe that CX919 needs 2A current for working without display.
I have not measured the needed current, but till now I had not a single problem with USB power. I think there is a need of stable power

...
i think ( because a read a lot in other forums about that) usb power supply is sufficient but in "hard use" cant be..

Please can you refer to this other fora

[smithmal]

I have search the Samsung manual, but the USB is only used for updating the firmware by USB stick.
No specification of max. current is given.

I can't believe that CX919 needs 2A current for working without display.
I have not measured the needed current, but till now I had not a single problem with USB power. I think there is a need of stable power

I don't believe the CX-919 needs 2A. I think it has a charger that uses that in case you won't to hook peripherals up to the stick (keyboard, HD, mouse, etc.). I've run it on 5V, 500mA (typical 2.0 USB electrical output output) with no problems when I'm testing following a firmware/ROM flash.

It would be nice to know what the minimal power requirement is for the stick without peripherals hooked to it though.

smithmal

[tr3w]

I also wanted to experiment with the 2A power supply what came with the stick, because others said it's not the best quality, and it can cause instability.
I only have problems under netflix, so I switched the power supply with an 1A one which is probably better quality. The result: the stick reboots right after starting the netflix app, before I can even choose a movie or anything.

So I think sometimes the stick alone need more than 1A...

[Supersnail]

Also, if using only USB power, the stick should not get nearly as warm since it's not pulling 2A of power.

This is a common misconception. Just because the power supply is capable of delivering 2 Amps doesn't mean the device uses all of it. The device uses however much it needs depending on the load. If your supply isn't up to the demand then the device will crash.

[elinx]

I have now for almost one month the CX919 powered by the TV-USB.
I have seen a lot of TV shows and movies with XBMC.
I had never a problem with rebooting and I am still satisfied.

I was began experimenting with other kernels like the ones of sam123.
With the OC 1080kernel 1.8/1400/800 I got a reboot after short time, CPU clockdown to 1.6 MHz was stable. The heat was acceptable.
It was not possible to run Antutu benchmark if powered by TV-USB, only with an AC adapter.(OC kernel 1.6MHz) (18900)
I tried too the stock 1080 kernel what is running almost a month stable, powered by TV-USB.
But again Antutu don't want to run, only with AC adapter. (17500)
(differences GPU 3300 vs 2100 and Ram 1200 vs 900)

My conlusion is that with regular use, TV-USB power is sufficient, but don't ask many more of the CPU.

[Hotabych]

Re: Power via USB Power port (is this all we need?)

My cx919 works great from tvs LG usb, Im watching youtube and movies from NAS - no reboots for more then 6 month

Отправлено с моего Nexus 7 через Tapatalk

[xlux]

I have a Sharp LED with 2 USB ports & for the longest every Android stick rebooted or crashed on USB power alone. My tv is hung on the wall & I always plugged my sticks to USB1 port on the side (only one that I can access) I decided to take it down & used the one on the back. Broke out the manual to see which one had priority. According to the manual, USB2 on my tv (rear) had priority. I connected all my sticks with different OC kernels & non rebooted or crashed. So it appears that depending on your tv brand, each USB port (if you have more than one) get different priorities as far as current draw. On my tv, I can run low demand USB devices on USB1 with no problems but Android sticks that need higher amperage have to be connected in the rear.

Test each USB port by playing video intensive games & see which one holds up with out reboots???

[TerryH]

Using TV USB has fixed Fly Mouse intererence

I'd been meaning to try the USB port on my Samsung LCD TV to power my CX-919. After reading this thread yesterday, I tried it. It works great. Streaming Video without issue from Netflix, Youtube and other internet streaming.

The really good thing that it has also assisted, is my Tronsmart TSM01 mini Fly mouse Keyboard, now works without issue. It appears that this has stopped the interference which was stopping it from working unless directly in front and within about a metre of the TV (sometimes it wouldn't function even when this close). I could not use it where I normally sit. Now I can use it, even in another room about 8M (25 ft) away without line of sight.