Develop Bugs

Tab is going into MTP mode and wont charge.....

This is hooked up to the Samsung charger , I have-no idea what the heck is going on..... anyone else?
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pdxrealtor said:
This is hooked up to the Samsung charger , I have-no idea what the heck is going on..... anyone else?
Sent from my GT-P7510 using xda premium
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if you turn off the tab and then plug it in, does the battery screen come on and does the device charge?

pdxrealtor said:
This is hooked up to the Samsung charger , I have-no idea what the heck is going on..... anyone else?
Sent from my GT-P7510 using xda premium
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My guess - faulty resistors in the charger or one of the wires in the cable is dead.
The Tab expects to see USB D+ and D- shorted together and floating at 1.2 volts, set by a resistor divider in the charger.
Does the cable work fine for USB data transfer?

I think the user has possibly used the wrong wording. If he's seeing the MTP mode come on that means that he's just got it plugged into a USB port on a machine whilst the tablet is on (whilst using the "charger" cable).
Simple answer if that's the case. The tab doesn't charge that way as there isn't enough power coming through the port to keep the tab on and charge. If you however switch off the tab, you should find it charges from the USB port
If not, let us know.

Actually the tab is going into MTP mode while plugged into the outlet, using the supplied Samsung power adapter and supplied 30 pin cable.
I think i need to call Samsung for replacement... although after really thinking about what I just typed I think might be simpler to just buy a new cable online.
Or is it the actual power adapter that's faulty....

Well that is quite odd then. Does the tab charge if you switch it off and then plug it into the outlet / pc?

Chiribo said:
I think the user has possibly used the wrong wording. If he's seeing the MTP mode come on that means that he's just got it plugged into a USB port on a machine whilst the tablet is on (whilst using the "charger" cable).
Simple answer if that's the case. The tab doesn't charge that way as there isn't enough power coming through the port to keep the tab on and charge. If you however switch off the tab, you should find it charges from the USB port
If not, let us know.
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No, his wording was explicit enough to indicate that the tab is falsely detecting the factory charger as a USB host. This will happen with iPad/iPod/iPhone chargers, and would happen with the factory charger if the cable were faulty (D+ or D- open) or if the charger were faulty.
Again, to the OP: Does the cable work for syncing to a PC to transfer data? If it doesn't work at all, that's a sign that D+ or D- of the cable is open.

Meh, some people use words such as charger and cable interchangeably in terms of their truer intended meanings at times.
I was simply trying to cover that base.

Not sure if the cable works for data ....as I do everything over the air. The cable was giving me troubles at the tab end, (loose connection) but lately has been working OK.
I also haven't been charging and using at the same time lately either. I really needto contact Samsung and talk to them about a warranty replacement, but I have a feeling I'd be better off just buying a new one off Amazon or the like....
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Wrong section n00b!!!!

akarol said:
Wrong section n00b!!!!
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Thanks for that...
Sent from my Nexus S using XDA Premium App

pdxrealtor said:
This is hooked up to the Samsung charger , I have-no idea what the heck is going on..... anyone else?
Sent from my GT-P7510 using xda premium
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I have the same issue. Check that with different cables. So cable and charger is not the reason

If you're running a ROM with Pershoot's kernel, you can "Enable Charge From ANY USB" (see link in my signature). If you're running something else, you can make yourself a "DIY Universal Charging Inline Cable" that will trick the Tab into charging off anything (again, see the link in my signature).
But before you go out spending money (even if it's just a little bit of $$$) you should see if the cable works for data transfer between your computer and the tab.
If the cable works, then the "DIY Universal Charging Inline Cable" will keep you going until Samsung sends you a replacement charger.

I had this problem and didn't know what was wrong for a while. It turned out the the charger wasn't plugged in all the way in the outlet. I guess it wasn't getting all the juice it needed.

Am suddenly getting this problem tonight also it sometimes turns my tablet off but won't let me turn it on till I pull the charger out.I've also noticed that if I plug it in when the tab is off the battery sometimes comes up saying it's charging
just plugged the usb lead in to 2 laptops and they both show a usb error

I started having the same problem 2 days ago. All of a sudden i plugged in the wall charger and it went into MTP mode. It will charge if turned off but I've noticed it takes a much longer time to charge. From 3% it took almost 24 hrs to completly charge. Thinking that I'll have to buy a new wall charger.

Please help
Another one about charging...
My 10.1 P7510 takes tooooo long to charge, even beeing off. If I connect it to my notebook data transfer is correct but battery keeps draining, or at least not charging. If I turn it off (either connected to PC or charger) the charging icon appears correctly. I must say that cable (and charger) are not the original ones
Is it a problem of the Tab, or cable, and/or charger ?

I think the charger did not have enough current to charge the tab while still using it. The stock charger should be rated at 5V 2A. I tried another charger with only 1A and it still worked. Anything lower than 1A will end up showing that MTP mode.
Sent from my GT-I9100 using XDA App

I've got the same problem myself except I had to clean the charger clean of marinade sauce (it's a long story, don't ask!) and I took the device back to my local Vodafone store (I got it on a Mobile Broadband contract) as I thought it was faulty. They claimed the device was working fine although they used their own cable and not mine. They also claimed that if it was the cable, I should be easily able to buy one.
I tried buying one in every store I could think of, including the phone repair shops and they didn't sell them at all!
It's just a shame that a tablet like this which could have been a great tablet is crippled not only with no MicroSD slot, but also using a crappy proprietary socket whereas all the other Tabs have a MicroSD slot/uses a Micro USB port.
(I've already ordered a replacement cable from Amazon UK in any case for a reasonable price)

mtp-connected and media scanner running
I bought. My Tab 8.9 last November, only started having this problem since last night. There is red cross and mtp-connected,also,"media scanner running". I am using original cable and adapter that come with the Tab. Has anyone here found a solution?

Charging via USB on computer

My device charges very slowly if the display is off. If the display is on it does not charge at all.
I've installed the Samsung drivers from the website. Is anyone else able to charge their device via USB? I need to know if I should exchange mine.
Sent from my SGH-T989 using XDA App

I was able to charge my sgs2 yesterday at work through the usb port. It might be the phone, or maybe the usb port you are trying to use doesn't have enough juice to charge the phone? have you tried another usb port on the computer?

usb will always charge really slow compared to an wall outlet

Yes I have tried multiple ports, computers, and cables. Oh well, I guess I'll live with it.
Sent from my SGH-T989 using XDA App

+1
dimitrie said:
usb will always charge really slow compared to an wall outlet
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what he said
if you want fast charging, do it from a wall outlet

jasontx said:
My device charges very slowly if the display is off. If the display is on it does not charge at all.
I've installed the Samsung drivers from the website. Is anyone else able to charge their device via USB? I need to know if I should exchange mine.
Sent from my SGH-T989 using XDA App
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USB supplies max 500mA. Is probably half what the wall charger is giving you. Nexus S is only 750. My guess gsII is 1000 (1A). iPad charger is 2A.
Edit: no a higher power one than the stock charger won't charge the phone faster in a noticeable way. Charging circuits in remotely modern phones limit current to that safe max. If they don't you're probably risking damaging your phone.
Sent from my Nexus S using Tapatalk

I understand that the USB on the computer is weaker. I was surprised to see that when the phone was connected to the computer, screen on, and streaming music that my battery was actually reducing slowly. I would expect the opposite and this behavior seems abnormal.
Sent from my SGH-T989 using XDA App

that's exactly the reason why in car i use the 2A charger (2000 mAh), and in house i use 1000 mAh wall charger
if i leave it at the computer USB charging, i've to keep it iddle for it to charge after like... 4+ hours
that's usually what i do at the work place, so i keep the battery topped up, for when i need to jump back in the road
as long as you have WiFi on, or 3G/4G on, or if the CPU is in high activity, you'll never see the charge ever reaching the battery.
i always keep a spare wall charger at the office as well for times when i need a quick charge

Thanks for the input everyone! I'm glad it's not defective cause I love this phone!
Sent from my SGH-T989 using XDA App

My issue is a little different but decided against another thread. My phone will not charge with any other cable. Has to be pluged in to oem cable. I left it all night on my old phones charger and woke up with it almost dead. Plugged into oem it just charges super slow. Should i take it back?
Sent from my SGH-T989 using Tapatalk

Does the other micro USB cable work with other devices? If not, might be a defective cable.
On a side note, who prefers to charge via 500mah vs 1A? I have been charging my phone since day one using my printer, as well as my old Iphone. My battery performance is great! +24 hours on a single charge with moderate browsing 50/50 wifi and 4g. I typically enable the "power save" feature with minimal brightness and 15 sec screen timeout.

I worked on other devices
Sent from my SGH-T989 using Tapatalk

[Q] Charging problem
I have an issue that has popped up today. When charging through PC, the phone (not battery) is getting pretty hot and losing charge. I'm not sure what could be causing it. I stopped all extra processes and turned off the screen. This is not occurring when the phone is off.

[Q] What the hell is going on with the charging??

Id like to hope im the only one whos experienced this. But whats going on with the charging? I love the dam phone but while charging it sometimes drops in percentage. Its happened in alot of situations. Stock unrooted, stock rooted, Frosty jb, and Xquizit. I try to underclock to see if that makes a difference but it gets worse. Can someone, anyone please help me out. It was even left on the charger last night and I awoke to 15%

Sounds like either a bad charger or a bad connection between phone and battery.
Sent from my SGH-T989 using xda app-developers app

Thank you. At least its possible it may be the charger and or battery and not the phone. Much appreciated.

I don't know what rom you on now, just keep as stock for now then keep checking 1 or 2 day still have problem, bring back to TMO for warranty.

Are you using the usb cable and the wall charger that come with the phone? I noticed that when I am using my other usb cable I brought from the internet to charge the phone with my PC, which only supports max 500mA current per USB port, the phone doesn't seem to be charging at all. Just like the op said, the battery percentage went down even though the phone is saying it is charging. Then I switched to the usb cable that come with the phone, and plug in to the same usb port on my pc. What you know, it is charging correctly now, the percentage went up. And it charge much faster when using the 2A wall charger that come with the phone.

I think the problem with charger
Sent from my LG-P500 using xda premium

If you are near a local T-Mobile store or distributor, why not pop in with your kit (phone, charger and cable) and do a little process of elimination to see if your problem is your phone and/or cable and/or your charger?

Ive been experiencing the same, but when using other chargers and usb cables. Weird. But it never happens with the charger the phone came with.
Sent from my SGH-T889 using xda app-developers app

Battery not charging even swapped the hardware,

It been a while sense I've messed with this. I have two galaxy nexus one is pretty tore up so I've been using it to charge my batteries. My good one will not charge even after micro usb port swapping.
The one that won't charge my batteries: I don't know why it won't charge. I swapped the hardware. It all started when I flashed slim over I think it was Kang. While I was on Kang(I think it was that one at least) I messed with some advanced battery settings and forgot or didn't think it metered switching them back. I can only assume this is the culprit.
It will recognize the AC charging but it will not charge or it will only De charge my batteries. If anyone can suggest anything please let me know.
Thank you.
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What do you mean "swapped the hardware"?

I swapped the micro usb port
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Flash a stock build to isolate it as hardware.

Copy that,
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Ended up swapping the main board, micro usb worked just fine
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Slie said:
Ended up swapping the main board, micro usb worked just fine
Sent from my Galaxy Nexus using xda premium
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I've got one that is doing the exact same thing. It connects to the PC ok, and shows the charging symbol but when you check under status it shows as not charging.
I took it completely apart, cleaned the logic board with a soft bristle toothbrush in case it had any thing that might be causing it to short, and even replaced the usb charging port flex cable.
I have noticed that when I plug it into the usb ports on my HDD docking station that it makes a low barely audible static like sound. my other working Galaxy Nexus doesn't do this.

doctor_evil said:
I've got one that is doing the exact same thing. It connects to the PC ok, and shows the charging symbol but when you check under status it shows as not charging.
I took it completely apart, cleaned the logic board with a soft bristle toothbrush in case it had any thing that might be causing it to short, and even replaced the usb charging port flex cable.
I have noticed that when I plug it into the usb ports on my HDD docking station that it makes a low barely audible static like sound. my other working Galaxy Nexus doesn't do this.
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OK an update to this, if I run the factory Jellybean 4.1.2 image or CM10 it still shows the charging symbol and shows as not charging in the status info, but if the phone is left alone the battery does charge. If I run the 4.2.1 or 4.2.2 factory image or CM10.1 it doesn't charge unless the phone is turned off.
very bizarre.

doctor_evil said:
OK an update to this, if I run the factory Jellybean 4.1.2 image or CM10 it still shows the charging symbol and shows as not charging in the status info, but if the phone is left alone the battery does charge. If I run the 4.2.1 or 4.2.2 factory image or CM10.1 it doesn't charge unless the phone is turned off.
very bizarre.
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That is somewhat odd that it will trickle charge yet. That usually is indicative of the usb flex being bad ... that or a bad charging cable but i assume that you have tried that already. Do you have data connectivity yet on this device? Usually you lose that when something like this happens, at least when it has for me. Do you flash the factory image via fastboot or odin ... You could try to odin it to ensure that everything is stock. But since your bootloader is charging that kinda rules out hardware especially since you said that you have changed it already. Only other thing i can think of is a kernel issue but that would be taken care of when flashing stock if you flashed via bootloader.

[Q] Charging problem

The phone was working perfectly until last few days. When connected to the socket via the charger, it shows that the phone is charging but it isn't(the battery instead keeps on decreasing while on charge) sometimes charging begins but really slowly.
However when connected with the computer through the usb, its charging ok.
Tried with an other samsung charger too, same problem.
Sent from my GT-I8160 using xda app-developers app

arhamiq said:
The phone was working perfectly until last few days. When connected to the socket via the charger, it shows that the phone is charging but it isn't(the battery instead keeps on decreasing while on charge) sometimes charging begins but really slowly.
However when connected with the computer through the usb, its charging ok.
Tried with an other samsung charger too, same problem.
Sent from my GT-I8160 using xda app-developers app
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Have you tried an iPhone (or generic USB) charger with the known working data cable?
Charger or USB power status is determined by the data lines instead of the accessory ID wire so you should get high speed charging with... well, mostly every charger.

@arhamiq, do U use custom ROM?
tapped from ace

_DsP_ said:
@arhamiq, do U use custom ROM?
tapped from ace
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Been using cm 10.2 since it actually came out.
Maybe its the chargers fault :s
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Have you changed settings in "Galaxy Ace 2" app? there is setup for wall socket current in "USB" sub menu - maybe you tweaked something there.
If you have any other charger with micro-usb try it (it should be fine with all chargers with amper range around 1A).

Tried with a sony charger but charges really slowly.
Sent from my GT-I8160 using xda app-developers app

oh, one more thing, have you cleaned teh usb port in your phone?
If not, switch the phone off, remove baterry (it's for removing any current from the cirquits) and with fine wooden toothpick or something similar, try to go around inside of a usb port of the phone - I was really supprised how much fabric can be pilled up there