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I've seen people complaining that the i747 doesn't charage when your using USB OTG. I was watching a 720p mkv movie off my wd-750gb hd and noticed my battery was going up not down. I seem to have gotten it working with the following combo: Generic USB OTG L shaped cable, D-link usb2.0 hub that I hardwired the positive 5vdc rail to the host upstream power rail and [ROM] AOKP(Jellybean) Task & Ktoonsez 9/11. I had previously modded the usb hub to work with my Atrix as it needs 5vdc on the host rail in order to activate host mode.
There are a few ways to get the charging working. I have one of these
http://www.dealextreme.com/p/usb-2-0-4-port-hub-with-splitter-cable-black-18cm-125451?item=30
and if I plug the black line in and the red line into a USB port, I get charging. It just seems to have to do with if you're on a powered hub and if the 5v rail is hot.
Now I need to get an MHL adapter.
Yeah that's my next thing to test. I have one in the mail now.
Sent from my SGH-I747 using xda premium
When I used OTG cable, stuff I plug into it get power from my i747... In theory, I can charge other devices from my i747.
However, I suppose if the device connected to the i747 via OTG actually is hot (supplies power instead of getting power), it would then charge the phone instead...
Just a theory,.... A powered hub (with it's own power supply), might be able to charge the phone and power the devices connected to it... But a non-powered hub will get power from the i747 and power devices connected to the hub from the phone's battery... Do note that some devices require a certain amount of power to switch on and actually work... the power supplied by the phone is limited, so using a hub will divide the power across the connected devices to it...
This is the most finicky phone I've had in regards to the USB cable. I've never had an issue in the past with any of the mini usb cables I have on hand, but half of them don't work on this phone. Caused me problems with odin flashing, transfering files, etc - so I wouldn't rule out the cable as a possibility for your problems. Also, if you have a higher rated charger (more amp rating on the label) you might see if you get the same behavior. Also, I find that once in a while, my phone is hot after being 'off'. When I go into battery usage I find that 'Android System' is chomping the battery up. I haven't figured out if it's rom specific or just a 'feature'. Maybe that's drawing some extra current - check your task manager when you're watching your show to see if something might be getting busy in the background.
Ozark_8125 said:
This is the most finicky phone I've had in regards to the USB cable. I've never had an issue in the past with any of the mini usb cables I have on hand, but half of them don't work on this phone. Caused me problems with odin flashing, transfering files, etc - so I wouldn't rule out the cable as a possibility for your problems. Also, if you have a higher rated charger (more amp rating on the label) you might see if you get the same behavior. Also, I find that once in a while, my phone is hot after being 'off'. When I go into battery usage I find that 'Android System' is chomping the battery up. I haven't figured out if it's rom specific or just a 'feature'. Maybe that's drawing some extra current - check your task manager when you're watching your show to see if something might be getting busy in the background.
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Click to collapse
My moto atrix was way worse for cables and chargers. At least I can over ride the 500mah draw with the sgs3. Unless it was made by moto or you crossed the d+ d- lines it refused to go into fast mode.
Ok, well...
I'm Korean, and I've searched almost every Korean tablet forums, yet can't find the reason :crying:
So I came to here, XDA.
The problem is, my Tab Pro 8.4 won't charge at all.
It's looks like an usual charging problem of Tab Pro 8.4, however, mine's little bit different.
With the charger plugged in and tablet is on, I can see the lighting shape on the battery icon at the status bar (which appears the charger is plugged in) ,
but no matter how long I charge the tablet, it's 0% and turn off after like...10 secs.
With the charger plugged in and tablet is off, I can see the battery pic appears on the middle of the black screen.
BUT, like the former situation, no matter how long I charge the tablet, I turn it on and it dies quickly.
SO, my problem is this, and i can't find a tiny reason why my tablet got (or how to fix) this battery problem.
Never seen a battery problem like I have right now.
I got several ideas about this. (Hope this will help you to fix my situation )
1. My tablet's rom is not pure. (But not rooted.)
As far as I remember, I applied the Ukrainian version about 3 weeks before.
Is it possible the this is the reason?
If so, wiping the original rom and applying the new one would help me?
2. Is it possible that the battery and the tablet connection got a problem?
If so, open it by myself and re-positioning the battery would help me?
3. The battery charger part might be damaged.
Then it leaves me the one option {GO TO THE SERVICE CENTER} ?
4. well...not 4.
have no idea.
Using same charger which is official SAMSUNG's.
I will keep monitoring this thread.
Little help to poor man would be really grateful, THX
PS
I just tested download mod.
With the charger is plugged in, it's working.
to see if the charger is bad, fully shut tablet down and then try to plug the tablet into a USB port on a computer and wait about 8 hours, then unplug it and see if the tablet holds any charge (battery might still be low but it should have enough charge to run awhile), if above works then it means you need another wall charger (5v 2.1A).
if it still just powers off or dies then it means the battery is bad or not connected or something else is wrong with it.
1. Try another USB cable
2. Try another 5v 2.1A wall charger
3. Try charging on a PC
4. replace battery.
To verify your tablet is charging, you need this little tool
http://www.ebay.com/sch/i.html?_fro...usb+power+current+and+voltage+tester&_sacat=0
Current should be 1.5 to 1.7 Amps, voltage should be 5 to 5.2 V
If the charging current is under 1.5 A, you should change different USB cable or adapter
If cable and adapter are fine, the next is charging port, it's easy to replace if your is defective.
Never use usb port on computer to charge, it only supply 0.5 A and your tablet needs at least 2 Amps for charging properly.
These are basic steps you need to do, without basic information I cannot tell what is wrong with your tablet: not charging or bad battery, or the worst: bad main board.
The one you have to verify: your tablet is drawing normal charging current around 1.5 to 1.7 Amps when plugged in. You can not troubleshoot problem just by guessing.
The most common problem of Samsung tablets are cracked Battery connector, a simple re-solder will fix the charging problem.
There are many unknowns, you have to eliminate charger, usb cable, usb charging port as the source of problem first. Then next look for battery or battery connector.
Otherwise, you will confuse yourself and others what causing the problem. Elimination is the key to figure out problem from many unknowns, one by one at a time. There's no short cut , otherwise, you can not figure out where the problem comes from.
I see many users send their tablets for service and the problem just comes from a bad cable because they have no idea what's wrong with their tablets.
Beut said:
To verify your tablet is charging, you need this little tool
http://www.ebay.com/sch/i.html?_fro...usb+power+current+and+voltage+tester&_sacat=0
Current should be 1.5 to 1.7 Amps, voltage should be 5 to 5.2 V
If the charging current is under 1.5 A, you should change different USB cable or adapter
If cable and adapter are fine, the next is charging port, it's easy to replace if your is defective.
Never use usb port on computer to charge, it only supply 0.5 A and your tablet needs at least 2 Amps for charging properly.
These are basic steps you need to do, without basic information I cannot tell what is wrong with your tablet: not charging or bad battery, or the worst: bad main board.
The most common problem of Samsung tablets are cracked Battery connector, a simple re-solder will fix the charging problem.
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Click to collapse
You can charge from a computer fine just as long as the tablet is fully shutdown first (so you see the battery icon scrolling), this will ensure the 500ma will go directly to the battery and not running the tablet and os, it will charge very slowly but it will eventually reach 100% as nothing is drawing power from the battery to drain it (though I would only charge to 20%, to see if it holds a charge), however this method is just for diagnosing if the charger is bad and have no current alternatives, obviously this should not be a long term solution and never used when the tablet is running, but rather to see if the battery can hold any charge at all.
if you have another 5v 1+A charger laying around then use that instead., if the charger is the problem you can pick them up pretty cheap off ebay (make sure the hallmark icons and model number match to avoid knockoffs)
otyg said:
if you have another 5v 1+A charger laying around then use that instead., if the charger is the problem you can pick them up pretty cheap off ebay (make sure the hallmark icons and model number match to avoid knockoffs)
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Click to collapse
To see what is wrong with charging problem, you should never use wrong charger like 5V, 1 A or a USB port on computer. If using a 5V, 2A charger and a correct USB , any reading is under 1.5 A, there is something wrong with charger, or USB cable, or USB charging port, or battery connector. Even wrong USB cable, the one has only max of 1A, also is the source of slow charging.
His issue is not with slow charging, it was as soon as he unplugged it the tablet instantly powered off, in this case if the battery is 100% dead then damage is already done and once a lithium battery is completely discharged then most likely no charger whatever the mA is will bring it back...this is why I was saying to charge it from whatever source since you need to get a charge into the battery before it's irreversible damage.
However after re-reading ops post I think it's safe to rule out the charger as the problem because he said he could run the tablet with it plugged in (so that means the Charger is providing enough power to run the tablet) according to my mA reader this alone is around 500-700mA in standard use / full brightness
This also mean we can rule out a bad Micro USB port on the tablet since a broken one wouldn't allow power to the tablet.
the problem likely lies with a bad battery or a bad battery connection, the probably only option at this point would be for him to have samsung service it or take the chance to replace the battery.
(BTW I have all the tools nessasary and I know what can and can't charge this tablet)
Yes I know it needs a 2.1a charger to charge it while it's actively running since a good portion of that power will go into running the tablet and LCD if needed, it does not need a 2.1A charger when it is powered off and 500mA to 2.1mA will still charge it.
Three is a thread here talking about reseating the battery. Look it up. That may help.
Agree with otyg. I recently had a similar problem. My galaxy tab s 8.4 would power off immediately after being removed from power. It would register as having 100% charge while turned off, but once powered on, the tablet would show 4% charged or lower. Another thread on this site mentioned that the battery contacts on the motherboard have cracked for some owners creating symptoms like ours. I resolved the issue by applying a low resistance conductive adhesive to the cracked pins linking the battery to the motherboard. If this happens to be your problem be very careful because there are other contacts next to the battery pins. Good luck!
Hi there everyone,
I have been trying to get my Nexus 7 2013 installed into my car seamlessly without problems since December 2015. I have Timur's Kernel v4 (6.0.1) running on it, and it was working flawlessly.
However, I decided that the no battery mod needed to be done as I just could not leave that battery inside a hot car - way too risky.
So, I did the Kevdav no battery mod - with success.
However, once the battery connection was receiving 5v via a usb car charger the OTG cable connected to the tablet's mini usb port would not wake/suspend the tablet properly. It would wake it up, but once it was awake the little battery icon at the top would forever show that it was 'charging' and once power was cut to the otg y cable / mini usb, it would not suspend (would still show as charging).
I did research, and bought a Drok DC-DC step down converter. I lowered the voltage to the battery mod connection to 3.7v (and tested up to 4.7v) and this alleviated the problem of suspend/wake. I think since the original battery gave out less voltage then the otg/charging connection, this needed to be replicated in order for the otg to work.
However, I now have a new problem that I cannot seem to fix. This problem only seems to happen in the car and does not occur when testing it in the house using normal wall chargers.
For clarity, this is how everything is wired up in the car.
Nexus 7 battery mod side of things:
Nexus 7 battery terminals > 22awg usb cable > drok dc dc step down power supply (this board has a female usb port for output) set at 3.7v (tested up to 4.7v) > input is connected to car's constant 12v connected directly to battery on a fused wire.
Nexus 7 mini usb port side of things:
Nexus 7 mini usb port > usb otg y cable > mini usb cable > 2.4a usb car cig adapter hardwired to car's switched 12v accessory wire.
The link to the drok dc dc step down is this - https://www.amazon.co.uk/dp/B01FDBY66Y/ref=twister_B01GO268W6?_encoding=UTF8&psc=1
I turn on acc ignition to send power to the otg connection. It'll power up. However, if left in standby overnight the tablet won't power up. If I physically press the tablet's power button it'll wake up, show the wake up animation, and react as normal (including any subsequent power downs). However, if I don't press the power button and I turn off the ign again, an icon on my car's instrument cluster will be faintly illuminated - this is odd behaviour and should be completely out. When this is the case, if I get out and try to lock the car the remote central locking doesn't work.
This light will go out if I physically disconnect the otg y cable from the tablet, and low and behold the remote central locking works.
I'm no expert on electronics and such, but it seems to me that power may be flooding back into the OTG connection from the no battery mod power?
Does this make sense? Sorry for the long question, but I was wondering if anyone had any experience with troubleshooting or any advice? I've this one problem and then I'm set but I just can't seem to figure anything out and need someone's advice who is in the know rather than take wild stabs in the dark using my own logic because if I do the latter, not only will I waste money on needless components but I'll more than likely break something. I've read stuff about diodes or something in order to regulate power flow but I'm not even sure I'm using the correct terminology here so if anyone can tell me I'm onto something here or I'm talking complete nonsense then anything is appreciated!
I did search these forums and google but I really cannot find anything that is similar to my problem.
Thanks for any input guys, whether it be any tips on what I'm missing or what I need to change (software or hardware, electrical, etc) - it's all very much appreciated.
Antony
Edit: so sorry I think I posted this is the wrong n7 2013 sub section. I can't delete the post but if a mod could please kindly move it to the relevant forum I'd appreciate it. Thanks!
antc101 said:
it seems to me that power may be flooding back into the OTG connection from the no battery mod power?
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Click to collapse
Hi, indeed, and your "2.4a usb car cig adapter hardwired to car's switched 12v accessory wire" requires a small mod to prevent the power feedback. It needs an extra 1A+ diode connected directly to 12V input. You could modify the adapter's PCB or simply replace the fuse's internal wire with a diode where its cathode goes to the spring and its anode to 12V input. Or just place the diode somewhere along the adapter's hardwire. $0.16 1N4001 is good enough ([email protected] is OK for [email protected]).
Not sure if thread is still active but I also have the same symptom with tablet turning off completely overnight. I am running constant 12v to 3.7v dc to dc on battery input and car adapter 12v to 5v on microusb cable in. Tablet will work fine with on and off but after car is shutdown for the night it will not turn on in the morning. It shows me battery charge icon only. I dont have diode installed either. Not sure if thats the cause. Anyone know why it would completly shutdown overnight?
Neo2020Marz said:
Not sure if thread is still active but I also have the same symptom with tablet turning off completely overnight. I am running constant 12v to 3.7v dc to dc on battery input and car adapter 12v to 5v on microusb cable in. Tablet will work fine with on and off but after car is shutdown for the night it will not turn on in the morning. It shows me battery charge icon only. I dont have diode installed either. Not sure if thats the cause. Anyone know why it would completly shutdown overnight?
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Click to collapse
Hi there,
Been a while since I posted on this thread but just wanted to update on what I have done so far.
Since my last post, I don't have any issues. I placed a diode as mentioned above on the +12v for the accessory power. This seemed to have fixed any back flow of power.
Concerning the power off over night, I'm pretty sure this was something to do with Timur's kernel. I forever had issues with that thing - eg, suspect and wake issues, accessories connected to my usb hub..
I switched to a stock version of android 6.0.1 - MOB30X if memory serves... and installed Elemental X version 5.16. No issues with this setup what so ever.
Huh.
I run my Nexus 7 on my car with the battery, mounted just above the dashboard, with direct sunlight exposition and no UV film on the windshield. It's been a whole year without issues, thank God.
https://i.imgur.com/cPNhDDc.jpg
I live in the Northeast of Brazil, where's 30C to 40C through the year. Sometimes I come up to the car and the tablet shut off due to the heat.
Battery still lasts wonders and there's no signs of damage.. yet.
Is it really adamant to remove the battery, or is it just a precautionary measure?
GTMoraes said:
Huh.
I run my Nexus 7 on my car with the battery, mounted just above the dashboard, with direct sunlight exposition and no UV film on the windshield. It's been a whole year without issues, thank God.
https://i.imgur.com/cPNhDDc.jpg
I live in the Northeast of Brazil, where's 30C to 40C through the year. Sometimes I come up to the car and the tablet shut off due to the heat.
Battery still lasts wonders and there's no signs of damage.. yet.
Is it really adamant to remove the battery, or is it just a precautionary measure?
Click to expand...
Click to collapse
You better have more luck.
My nexus was put under the dash and was fine for around 3 years. And it became expanded in just 2 days, separating the screen and the case. So I have urgently remove the battery.
As the title I'm having problems charging. A lot of the time the battery is discharging and requires being charged inside, where it does charge consistent and fast!
I the car I have a 10amp 5v dc/dc converter providing the power, I have the thick cable OTG from amazon, along with Amazon basic USB cable extensions, and a 4 port hub.
I've used different chargers, even dual chargers with a USB hub that had independent power, I changed the OTG cable, Heck I even changed TABLETS! From a Wi-Fi to an LTE. The only common thread is the backup camera and Timur's kernel.
Considering it charges perfectly plugged into a wall I assume it's not the kernel.
I've seen at least one other with this issue, Any ideas? I've been playing with this for months and as mentioned have changed every aspect of the install except the camera.
fr4nk1yn said:
As the title I'm having problems charging. A lot of the time the battery is discharging and requires being charged inside, where it does charge consistent and fast! I the car I have a 10amp 5v dc/dc converter providing the power, ...
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Click to collapse
These car chargers supply perfect 5.0V while your original Asus AC charger delivers 5.2V (have a look at its specs). Believe it or not, 0.2V makes the difference, and at 5.0V your tablet will not charge reliably. I actually use a regulated PSU set higher, at 5.3V, to compensate for voltage drop on poor USB cables.
Look for 5.2V/2A car charger and use max 1m quality USB cable, no hubs.
Thanks. The charger is indeed 5.2v. Odd. What charger are you using?
This is the one I have: https://www.amazon.com/Converter-Re...1513386282&sr=8-8&keywords=dc+to+dc+converter and it puts out 5.1v
I found it was only getting 8v-10.5v and wired it directly to the car's wiring, I was using spades previously to connct to the Aux power connector, Getting full 14.2v made no difference to the tablet's charging.
Next I removed the tablet and plugged it into a 5v/2amp wall charger using the old OTG and the old 3 foot USB extension cable. It charges consistently between 580 - 740mA. Meanwhile it went dead installed in the dash, again.
fr4nk1yn said:
This is the one I have: https://www.amazon.com/Converter-Re...1513386282&sr=8-8&keywords=dc+to+dc+converter and it puts out 5.1v.... Meanwhile it went dead installed in the dash, again.
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Click to collapse
To diagnose this problem you will have to acquire a simple, cheap USB meter and connect it as close as possible to N7. Note on the attachment my N7, 15cm USB cable and a tester measuring 5.18V. Please post your voltage reading.
I bought a 3amp adjustable DC to DC converter.
Set the voltage to 5.3v initially, then measured at the end of my 1 meter USB extension cable. It was still 5.3 so I dropped it back to 5.2v.
Plugged the tablet in, and it's immediately discharging at 563mAh. No apparent change after some use.
Thanks @k23m for the help. This thing just deteriorated. Something pulling a huge amount of power too. Sucked a fully charged battery to 0 in a day of of running errands. And it was sluggish beyond belief. I thought the ROM might be corrupt.
So I did the battery removal mod. It's working great on the bench so it's being wired up tomorrow. Thanks again.
M:y phone is sitting in the official samsung wireless fast charger (the stand up one for the Note10+) I am also using the official cord and charger. With the phone fast charging in the holder I plug my chord Hugo 2 (an audio DAC, it doesn't charge or draw power at all) into the usb-c port and the phone reduces the charging speed from fast wireless to normal wireless. This dramatically slows the charging rate. The problem is entirely software based so I believe there is some sort of package I can disable to prevent this. The phone believes I am using the charging port to charge it or some other device but I am actually only using it to send digital data to the DAC. I have tried changing the settings for USB devices in developer options (transferring files, etc) but no luck. Thank you.
I need a fix too. Anything yet?
maybe it is just like that because it thinks it will overheat... on the lg g4 it only charged faster when it was not picked up or moved and i think screen off. well the screen was off when i used the watt meter
ike__1985 said:
M:y phone is sitting in the official samsung wireless fast charger (the stand up one for the Note10+) I am also using the official cord and charger. With the phone fast charging in the holder I plug my chord Hugo 2 (an audio DAC, it doesn't charge or draw power at all) into the usb-c port and the phone reduces the charging speed from fast wireless to normal wireless. This dramatically slows the charging rate. The problem is entirely software based so I believe there is some sort of package I can disable to prevent this. The phone believes I am using the charging port to charge it or some other device but I am actually only using it to send digital data to the DAC. I have tried changing the settings for USB devices in developer options (transferring files, etc) but no luck. Thank you.
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I spent sometime looking and I have not seen nor encountered any package you can disable to do what you want to do. Charging functions like that are gonna be android system files, and things like .dll, .sys, .cfg and etc. This excludes any form of hardware components that monitor, limit, protect and control charging.
To be honest circumventing the charging functionality on the phone is a potential recipe for disaster.. it's not fast charging for a reason. It could very well be a safety precaution to prevent damage or overheating.
When I read up on the device the DAC might be trying to draw power from the phone via the USB connection. I get the same thing when I plugin a USB-C to HDMI adapter into my phone, and the adapter is obviously drawing power. Even though one would figure it shouldn't be since it's just a little ol' adapter something, it obviously is because it does get a little warm to the touch. So I wouldn't discount the notion that the DAC is drawing power in some fashion, because the phone isn't throwing that charging message for no reason.
Try making sure the DAC is in desktop mode (or equivalent) when you use it, so the device is drawing from it's internal battery. You should contact the company that made the device and ask them for suggestions/ideas. It maybe as simple as getting a specific cable, a compatibility issue with the DAC or what you do when you plug the DAC into the phone. It may just very well be that there is no solution and this is how it will work.
scottusa2008 said:
I
spent sometime looking and I have not seen nor encountered any package you can disable to do what you want to do. Charging functions like that are gonna be android system files, and things like .dll, .sys, .cfg and etc. This excludes any form of hardware components that monitor, limit, protect and control charging.
To be honest circumventing the charging functionality on the phone is a potential recipe for disaster.. it's not fast charging for a reason. It could very well be a safety precaution to prevent damage or overheating.
When I read up on the device the DAC might be trying to draw power from the phone via the USB connection. I get the same thing when I plugin a USB-C to HDMI adapter into my phone, and the adapter is obviously drawing power. Even though one would figure it shouldn't be since it's just a little ol' adapter something, it obviously is because it does get a little warm to the touch. So I wouldn't discount the notion that the DAC is drawing power in some fashion, because the phone isn't throwing that charging message for no reason.
Try making sure the DAC is in desktop mode (or equivalent) when you use it, so the device is drawing from it's internal battery. You should contact the company that made the device and ask them for suggestions/ideas. It maybe as simple as getting a specific cable, a compatibility issue with the DAC or what you do when you plug the DAC into the phone. It may just very well be that there is no solution and this is how it will work
.
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Comprehensive and concise in your hypothesis. Thank you. Most likely something they took into account with any adapters. Going to do some other testing too.:highfive: