Preventing charging when connected to PC - Galaxy S II Q&A, Help & Troubleshooting

I use my S2 tethered to my laptop (via USB) but what it means when I'm away from a power source is my laptop discharges quicker because it's charging the phone. So I end up with dead laptop battery, fully charged S2.
I'd like to be able to not have the phone charge when connected.
I've heard there are issues with creating WiFi hotspots? It didn't work for me on first attempt so I didn't pursue it further.

Possibly if you cut the +5volt and ground wire in the usb cable it might work, then you'd have only the +/- data wires. Just do a bit more research on this as im just thinking out loud, no idea if this will actually work.

In case you use Siyah-kernel, adjusting the charging current is also an option.
WiFi-hotspot-tethering should work, too, however, it will also give faster battery drain of the mobile (and the laptop also has to keep WiFi active).

Related

USB Tether

So I tether my computer to my 3G connection via USB with pdanet... but whenever I hook it up and use my phone, it doesn't charge my phone, and I lose quite a bit of battery after using my phone for a while... And the phone gets pretty warm...
And, I've also been hearing things about an actual cap to 3G data... should I not be tethering?
Thanks.
I can't say that I am wholly surprised that your phone is getting warm. I'm not sure about the charging though. The longer you use your phone, especially while connected through USB will get warmer and if it doesn't get charged it will die significantly faster. Without PDANet does it charge via USB fine?

[Q] Wired Tethering

I use PDAnet tons of times on my Droid 3, since I moved on to a better phone, I wanted to use it as well. Problem here is, My battery drains fast as hell, Normally I though the port isn't providing enough power to keep up with the draining but I used my desktop which has USB 3.0 and High power ports and still the same issue.
I already experience issues with this phone and planning to get a replacement but I'm just wondering if Anyone else has this issue and will it continue with my new ReZound?
our phone isn't a usb 3.0 device, so it can't take advantage of the extra power.
solution (level: Dealwithit)-- i found turning the screen off at least keeps power use down on the phone enough to keep it level, or gain at least a tiny bit of charge. I use wifi-tether like this, net is 0mA or ~+15mA.
solution (level: Awesome)-- make a hack usb driver for windows that just forces 1A down the pipe rather than waiting for the device to request it
thatsricci said:
solution (level: Awesome)-- make a hack usb driver for windows that just forces 1A down the pipe rather than waiting for the device to request it
Click to expand...
Click to collapse
You can shove all you want down the pipe, the phone won't use it unless it's tricked into AC charge mode.
mjones73 said:
You can shove all you want down the pipe, the phone won't use it unless it's tricked into AC charge mode.
Click to expand...
Click to collapse
I'll have to confirm, but my belief is the usb host is what dictates how much is ultimately sent... obviously it does this according to the specifications, so presumably the dumb connector just takes whatever it can get... I'd be surprised if a usb device would double check the current it's receiving from a host that has follows the spec... especially when the same port we know can take an AC charge. I have an external portable battery charger, that when it's max, it can deliver the full 1A, but as the external source drops in charge, it delivers less - so it doesn't maul it's own battery, when the external supply starts to deliver less, the phone reports USB charging mode. so I'm wondering if it just reports ac/usb based on how much mA it's getting through the port anyway.

[Q] Charging Issue - MHL/HDMI Adapter Samsung s3 lte

Hi All,
I was wondering if anyone had any insights in to this problem I have been having.
Briefly, I have the 4g lte verion on EE's new network. I purchased the official MHL/HDMI adapter which works fine and the video is outputed to my sammy 50inch tv fine. The issue I have is the battery drains while doing so. I belive this may to due to the phone outputting more than it is drawing from the power source. Any thoughts ?
I spoke with Samsung tech and they said a number of people have started to report this issue and they are currently testing/investigating. If this is indeed the case seems a pointless acessory as a long video would possibly drain the whole battery, Im yet to test the full drain time.
Secondly, with a 3rd party docking cradle with spare battery slot which purchased from amazon (http://www.amazon.co.uk/eLifeStore®-Samsung-Desktop-Charger-Docking/dp/B008PPRGFY) also does not charge phone properly. Even with the orignial charger in the ac port (or usb port) . The phone reports as charging but stays the same or decreases. Charged directly from the socket it is fine. Strange!
Any help or thoughts would be greatly appreciated.
Thanks
Ian
It's common. Mine did that too! I switched to my old S2 charger, problem solved
Thanks Ill try that out, any idea why that works ?
lawboffin said:
Thanks Ill try that out, any idea why that works ?
Click to expand...
Click to collapse
No idea man? A design fault maybe? All I know is that my phone took for f#*%ing ever to charge with the USB type wall charger. I pulled it out of the socket and plugged my other other one in that was sitting right next to it and it started charging? Checked a few minutes later and it had climbed considerably so I pulled the USB cable out of the new plug and kicked it under the bed where it now lays resting not to be used again LOL.
USB plug/cord works perfectly fine? So I use it on the computer. My laptop even charges the phone via the USB cable faster than the socket plug (which is usually the opposite - as I am sure we are all aware). So yeah I would say poor design or defective wall plug or both or something? Wasn't going to send my phone back because of it. 2second decision problem solved Samsung phone is great!
Im having exactly the same problem.
I have an s3 on orange and have the same mhl adapter conected to my tv.
I have tried the charger from my s3 which does says its charging when I connect my phone but only for about a minute so I also tried using the charger from my s2 and that just does exactly the same.
An easier way is to buy the official allshare dongle for your hdtv then you can stream anything from your phones screen direct to your tv and can have the phone on charge via pc or wall socket at the same time,
Hope this helps
i suggest you throw away your original charger (slow charge) and its usb cable (loose - actually caused the extsd to become damaged to the point i had to repartition) and buy yourself a cheap usb cable for data (£2) and a 3rd party charger (pref not a usb adapter one - £5) and all should be fine!
I still experienced a small battery drain while using the mhl adapter, however, i froze a few apps with titianuim (ones i know run all the time like utter and tasker, paragon ntfs, easy ums, directory bind etc), and put it on min brightness - works like a charm. I know its a effort freezing apps but does the trick with my phone... Since finding that out i actually keep paragon & easy ums frozen till i need them...
just a few thoughts for you....

[Q] PC wont see phone when plugged into USB but it charges still.

Just rooted and flashed the omni rom (love it btw) I plugged my phone up to my laptop and nothing, then my PC and nothing again. The phone charges off both though.
Thanks
Are you sure the cable is good? I've had experiences with some cables that only charged the phone and couldn't transfer data.
I have similar
Almost like the USB port gets a little loose with gravity. If I rest the phone and the cable on the desk, I can't maintain the USB connection. If I put the phone near the edge, and let the cable hang over, it puts just enough torque for the data connection to work.
Happens no matter what cables I use.
I've thought about asking HTC, but I have a feeling it means it goes in for repairs.

Has anyone successfully recovered from the sudden no charging/USB connection issue?

I'm wondering if anyone has suffered with and recovered from the sudden case of no charging/USB>PC recognition?
I've seen countless similar stories across the web, covering many of the Z Family. Some were simple reset jobbies, and I've seen as in-depth as what I'm assuming is an IC being removed, flux cleaned and re-applied (w ww .you tube. com/watch?v=ZyCeNfc99a0).
I purchased a new charger port and also a new battery, as I figured with all the insane constant burning of my pocket, it could use a new one. I'd hoped it was just a charger port issue, but much to my dismay, the issue still persists after fitting them.
I've tried every single button combination "fix", and all to no avail. Multiple leads, charger units, all that polava. Checked and cleaned connections with isopropyl alcohol, checked for burned-out looking mainboard components, at least those that are visible.
I was having minor inconsistent charging issues for a while, up until last Friday. I figured it was the USB port on the phone or the leads, and put it down to general wear and tear.
Last Friday I was at my mates house with super low battery, popped it on charge round his and I noticed it had died completely and kept boot cycling, like the charger was being plugged in and taken out over and over.
I took it out and tried it when I got home with the regular charger, and nothing. My phone is otherwise in mint condition and has been looked after since day one release in the UK.
I'm wondering if some super helpful person here would possibly have some other alternatives that haven't been mentioned, whether a hardware bypass or some trick that isn't amidst the countless cries for help out there.
Many thanks in advance.
Hello,
I have a problem when connecting to a charger it will go in strange charging mode that actually does not charge. It makes the sound like a charger is connected, no charging animation on battery though...
The problem for me it was the USB cable used for charging (i have changed 5 of them in 1 and a half years). Also same behavior happens when using a under 1A wall charger.
P.S. : The USB cables that i have changed they still work fine with other devices/phones .... but not with my Z5C. I`m not sure what but is definetly something wrong withe phone usb port (and it is not dirt).
no, but
I cannot get a usable USB connection to my computer, but if I hold Volume Up while connecting the USB cable to the computer, the charger LED turns red for a moment, then blue. It WILL charge in this mode, which I think is fastboot mode. Someone said it bypasses the charge circuitry or software, which makes me think that maybe I could go into developer mode and turn on OEM unlocking to see if I can stop it from trying to optimize charging. I also have not tried all the USB connection modes yet.
I tried to charge with this blue light technique on the wall charger, but that did not work. Just ran the battery down again and I could not boot the phone.
I know if I press Volume Down while connecting the USB cable to my computer that the charger LED turns green, but I am not sure it will charge in that mode. I think this is for flashing or something, but since my computer does not recognize the USB device no matter what I do, I don't think flashing is an option.
Oh, and when I do charge the phone with the blue light special (old obscure USA discount retailer reference), for some reason the charger LED flashes white every 4 to 5 seconds, but it seems to keep enough charge to get me through at least the day until I can charge again by same method.
Maybe we can keep pooling info here. I got the blue light technique from someone else on this site, so there are people here who know quite a bit about this phone, thankfully.
Well, I had that issue, too (at least it sounds pretty familiar).
https://forum.xda-developers.com/z5-compact/help/wont-off-issues-t3485575
Does your phone also believe to be connected to "something" all the time?
I fear there is some IC fried, although I never dared to open my phone.
My "solution" was to talk my local salesman into giving me a (used, but working) replacement phone, and I did not want him to find any traces of DIY
So, no, I never found a technical solution, probably they just scrapped my phone for spare parts, idk.
The root cause for my error (probably) was a faulty charger, therefore I am pretty sure I fried something hardware-like, but depending on your cause, ymmv.
Anyway, trying to clean your USB port, re-soldering the connector and/or replacing the battery sounds like being worth a try, anyway.
// edit: "cat /sys/class/power_supply/usb/present" used to always output 1, even when not connected. On my now-good Z5C this works like it should (connected ->1, not connected -> 0)
Hey people. I have tried all the tricks for several days. Tried several charging cables. Nothing worked for me. I just brought a new phone, and it came with a cheapo charging cable. Decided to plug it into my Xperia and it worked. Maybe a little fairy fixed my phone when I was out buying a new one. Anyway, I'm love my Xperia Z5. Using it right now. Good luck people

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