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?
Sent from my GT-P7510 using xda premium

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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Click to collapse
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....
Sent from my GT-P7510 using xda premium

Wrong section n00b!!!!

akarol said:
Wrong section n00b!!!!
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Click to collapse
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
Click to expand...
Click to collapse
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?

[Q] 120v/USB wall combo outlet charges everything but the galaxy S4

Today I picked up and installed two combo 120v/USB wall outlets so I can get rid of all the wall warts I currently have. The USB ports charge everything (tablet, HTC phone, Bluetooth) but the two galaxy S4's I have. Has anyone used one of the outlets before? Any ideas on why they will not charge the S4's?
The Specs for the USB side of the outlet is.
Switching Frequency Typical 140 kHz
Output Voltage Nominal 5V (+/- 10%)
Protection Current Limiting and Thermal Shutdown Protection
Output Current Constant Current Maximum 2.1A
The outlet is a Commercial Spec Grade Combination USB Charger made by Cooper Industries
Part number is TR7745 if anyone wants to look it up for any reason.
Thank you in advance for your help.

change usb cables
Try changing to a different USB cable. It's weird how often this is the problem.

What does it do when you plug it in? Does it do anything at all? Does it even act like it's connected? Does it TRY and charge but just can't keep up? I have ones by Leviton that work fine with my S4 and my fiancees iPhone/iPad.
EDIT: I just noticed if you look at the reviews on Amazon HERE it seems multiple people have had problems with the S4 and this model. One thing I noticed with most that I looked at before buying mine was that the listed current was shared between the ports, whereas the Leviton version has one port that's 2.1 amps and one that's 1 amp independent of each other. This one might be 2.1 amps shared, so anything else plugged in might not work out.

02CWRX said:
What does it do when you plug it in? Does it do anything at all? Does it even act like it's connected? Does it TRY and charge but just can't keep up? I have ones by Leviton that work fine with my S4 and my fiancees iPhone/iPad.
EDIT: I just noticed if you look at the reviews on Amazon HERE it seems multiple people have had problems with the S4 and this model. One thing I noticed with most that I looked at before buying mine was that the listed current was shared between the ports, whereas the Leviton version has one port that's 2.1 amps and one that's 1 amp independent of each other. This one might be 2.1 amps shared, so anything else plugged in might not work out.
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I'm having the same problem. It's listed as "dual 2.1A". The first second I plug it in it flashes the charging indicator, then it goes off. No charging happening whatsoever.

farkmeil said:
I'm having the same problem. It's listed as "dual 2.1A". The first second I plug it in it flashes the charging indicator, then it goes off. No charging happening whatsoever.
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Did you ever have any luck with the S4 problem? Does it make a difference which side you plug the USB cable into?

re: charger
olneybrandon said:
Today I picked up and installed two combo 120v/USB wall outlets so I can get rid of all the wall warts I currently have. The USB ports charge everything (tablet, HTC phone, Bluetooth) but the two galaxy S4's I have. Has anyone used one of the outlets before? Any ideas on why they will not charge the S4's?
The Specs for the USB side of the outlet is.
Switching Frequency Typical 140 kHz
Output Voltage Nominal 5V (+/- 10%)
Protection Current Limiting and Thermal Shutdown Protection
Output Current Constant Current Maximum 2.1A
The outlet is a Commercial Spec Grade Combination USB Charger made by Cooper Industries
Part number is TR7745 if anyone wants to look it up for any reason.
Thank you in advance for your help.
Click to expand...
Click to collapse
Try using a different usb cable from phone to charger,
be sure both ends have a snug fit and it should work.
I have one which is similar to yours.
Since it puts out 2.1ma just like the stock S4 wall charger
it should charge just as fast.
Good luck!

bitbang3r said:
Did you ever have any luck with the S4 problem? Does it make a difference which side you plug the USB cable into?
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Click to collapse
Unfortunately no. I didn't mention before that I'm an EE, however, none of the troubleshooting steps I could think of had any effect. :crying:

Can use A Cooper USB Electric Outlet with S3 and S4
I saw this thread while trying to solve this very issue. I have the Cooper USB outlet and installed it thinking it would charge my phone and my wifes. It would charge her S3, but not my S3. She has the LTE version (SGH-I747) and I have the HSPA version (GT-I9300). Well I thought it would not charge my S3. After playing with it for a few minutes, I could get the charge light on the outlet to blink. No charging was happening as the charge light on the outlet would just blink and then stay off. On my wifes S3 I could plug it in it would start charging instantly.
After playing with my S3 and the cord (The same cord used for my wifes S3 as I had already tried numerous cords) I found I could slowly insert the micro usb end into my S3 and it would start charging. It was tricky, but after 30 minutes of wasted time, I got it to charge. I would have to ever so slowly plug it in, either at a sideways angle or at a slightly elevated angle. This was regardless of the usb cord used.
However my S3 died and I got an S4. Naturally my S4 would not charge just by plugging it in, but I tried the "slow insert" method, on both the micro USB side and the outlet side and both worked.
I am thinking there is some kind of tolerance issue surrounding the electrical connections. Sliding the USB connector in slowly at the outlet side, I beleive, would ground the connection first and then allow for charging, but this is where my knowledge of electricity starts to bad. That said it is possible to use the charge, but it is not plug and play.

I just picked up a couple of these for the kitchen to alleviate the eyesore of the wall warts and I can also confirm it charges everything I have thrown at it except my S4 (jfltezvw) =( I quickly found this post after googling it. I am currently doing some work on the phone now but I will attempt the super technical "plug it in slowly" later and see if it works =)
Has anyone had any luck with other brands? I find this REALLY odd.

just installed this same outlet, and sure enough it charges everything except the S4..."slow insert" doesn't seem to work...does anybody know of any other solutions besides not using it?

wall charger option
I also have one of these outlet/usb from cooper that will not work with my s4.
Has anyone tried to use a DUAL POWER micro USB cord (like the ones that comes with the portable hard drives) to see if that would do the trick?
unfortunately, I do not have one of these cables, or I would try it myself.
Here's what I am thinking is happening...
The S4 is equipped with a smart charger that can trickle charge after a complete charge cycle.
When first connected, the s4 starts a trickle charge while it tests the battery for the charge cycle.
The cooper is equipped with a current limiter that shares power between the two outlets.
The cooper unit sees the trickle charge, and switches to a lower current setting for the slot with the s4 plugged in. reserving current for the empty outlet.
The s4 then tries to engage a fast charge, but cant due to the lack of current, and shuts down the charge circuit.
If a dual usb cord to micro usb cable was used, both outlets would be tied to the s4, and full power would be available to the s4 at all times.
Of course, without a cable myself, this is almost all conjecture on my part, and I could be just blowing smoke up my own arse, huh?
LoVoltage
EDIT: Of course, remember that the cable you use has to have the D+ jumper to signify the 2.1 amp availability. If you don't, the cable won't work. (Most dual port usb cables have this jumper already. so does the OEM samsung cable)

Just installed one of these tonight. Specifically the Cooper TR7745/TR8245 15A/125V
I can charge my Note 2 (SGH-I317), Nexus 7 wifi, but not an Samsung Galaxy S4 (SGH-I337). Kinda weird.

which USB cable for Original Charger Note 10.1 2014

Hello guys. I own the P605 model for 2 years now and since then the tablet runs smoothly like butter. Now the only problem i encountered is that the delivered USB cable is showing some signs of tearing at the side of the micro-USB pin after becoming suddenly yellowish in color after the last charges. My question is which USB cable should i buy now for the original charger of my note tablet to have the same power supply as before, considering that it has to provide 2A and 5,3V. I hope you can help me out on this task and i m looking fwd to your answers.

Unless I'm misunderstanding you, any micro USB cable will work with your charger. Some companies advertise gold plating, cables specifically made for charging, or faster/optimal charging speeds, but any cable will work. I've used about 5 different cables with my tablet and my phone. All of them were just lying around the house.
Sent from my SM-P600 using Tapatalk

NtinosMD said:
Hello guys. I own the P605 model for 2 years now and since then the tablet runs smoothly like butter. Now the only problem i encountered is that the delivered USB cable is showing some signs of tearing at the side of the micro-USB pin after becoming suddenly yellowish in color after the last charges. My question is which USB cable should i buy now for the original charger of my note tablet to have the same power supply as before, considering that it has to provide 2A and 5,3V. I hope you can help me out on this task and i m looking fwd to your answers.
Click to expand...
Click to collapse
do yourself a favor and don't cheap out. those 5/$5 cables have crappy connectors and fall apart quickly if they even charge at all and usually dont carry data. Anker's cables are great, and not overly expensive. I haven't had luck with nylon braided cables either, stick to rubber i would say

G4 Charge/USB port issues

I've had my G4 since almost launch day and within weeks the supplied USB cable stopped charging the phone. I thought it was a cable problem, but it worked fine with other devices.
I tried other cables with the G4 and these still charged it so I thought nothing more of it until charging degraded with every USB cable I own to where the phone would only charge 20-30% during an overnight charge and the phone would frequently not recognise it was plugged in at all. I contacted LG who did a repair under warranty and all was fine.
I've now had the repaired phone back for about 3 weeks and the same problems are starting up again and it's only a matter of time until I am forced to return again for a repair.
Is anyone else having similar problems? I thought I may have just had an unlucky manufacturing problem, and the LG reps confirmed that to repair my phone they basically replace all the internal circuit boards and components rather than just replacing the individual component that is faulty (in this case the USB/charging port)

Basic debugging includes asking stupid questions, so please forgive but still answer any of those
Are you using a different charger? If so, check if that one is within specifications and if you do send in for repair again, use a different charger.
Are you propping up the device at an odd/weird angle or in a dock of some sort with the cable attached?
(As they replaced the entire print, it's probably not this, just the USB-micro port bent or broken.)
You could double check the wall outlets being used, there might be some kind of electrical problem there.
Either using all kinds of fancy electical testing gadgets, or stick a USB light into the hub or charger, does it flicker?
When sending it back for repairs, did they check the stock charger as well?
Hopefully these questions help you find any logical or plausible cause.

FreezyExp said:
Basic debugging includes asking stupid questions, so please forgive but still answer any of those
Are you using a different charger? If so, check if that one is within specifications and if you do send in for repair again, use a different charger.
Are you propping up the device at an odd/weird angle or in a dock of some sort with the cable attached?
(As they replaced the entire print, it's probably not this, just the USB-micro port bent or broken.)
You could double check the wall outlets being used, there might be some kind of electrical problem there.
Either using all kinds of fancy electical testing gadgets, or stick a USB light into the hub or charger, does it flicker?
When sending it back for repairs, did they check the stock charger as well?
Hopefully these questions help you find any logical or plausible cause.
Click to expand...
Click to collapse
Hi FreezyExp,
1. I am using the standard charger that came with the phone, but this has not been repaired/replaced. I have tried other chargers too, but all the same issue.
2. No weird propping up or anything like that. If I hold my phone while it is plugged in it is constantly vibrating as the charger connects and disconnects, and if I place it on the desk to charge I have to ensure that I have at least 3-4" of cabe "on the desk" to give it enough support to make the connection.
3. Wall connection is fine and I have tried it with a range of outlets around the home, both with extension sockets used and plugged directly into the wall and there is no different. No flickering light when using a USB light either.
4. When I sent it back all they asked me to return was the main section of the handset - so no battery or rear cover, no cables or chargers etc
It does seem to be the same issue as last time, a USB connection becoming loose from the main motherboard, but it seems weird that I have had the same issue twice in the space of 4-5 months.

I've been having some sort of problem with my G4 usb port. If I plug it in to a computer, it will lose connection and get a connection again if I barely touch the end of the cord at the phone end. I've tried many different cords and different usb ports on my computer, but it still has problems.
I can't fast charge, either. When I plug it in to fast charge, it actually starts discharging even faster. I've had some extreme battery life problems, too. It drained from 100-36 the other night with everything disabled, and it's been doing that kind of thing a lot lately. I'm guessing that the charging port is what's messing up my battery life because it won't charge correctly.
Never dropped it or anything.

I got my G4 on January 24 and my USB port has also failed. I am getting a replacement from Verizon, but am concerned that a six month old phone has this issue.

I also own a G4 H815. A while ago the phone started not receiving any charge from the cable and I would have to prop it up from right under the cable's micro usb end. Thought it was because it was bent inside the port and not making connection with the cable so I had the port replaced. Now I'm experiencing the same problem and I think it might be the cable that's already gone kaput and is effing up the port itself. I took the phone to the same place to get the port replaced again and bought new cables (I lost both the original adapter and the cable, which were charging slow anyway. Now using a 2A Asus adapter which works great) and when I asked the guy at the repair shop, he says it's a chronic issue with G4 devices. I don't really understand how it would happen twice in just a few months even with a new charger port. What should I make of this? Did they replace my port with an already faulty one, cahrged me full price and now trying to sell this bogus or am I really doomed with this phone?

Some questions on charging battery issue

Hey guys. Just wanna ask some question.
My note 10.1 2014 P601 is now running stock 5.1.1 un-rooted. Basically everything stock. I know that our Note need its own charger to work properly. But I lost the original charger long ago, and I've been using only the USB I bought separately to charge my tablet by connecting it to PC.
Now, my mother just bought a new phone (Galaxy A7) and when I try to charge my tablet with her charger, sometime it shows X mark (which means insufficient, exactly like when i connect to pc via USB cable) on the battery icon, but sometime it shows the lightning (which is fine) icon. The speed of the charge depends on that sign, if on lightning sign, from 0 to 100% takes about 4h. But if on the X mark sign, 4h will just get around 40%.
I don't really know what happened, but I have to unplug then re-plug again and again to get the lightning sign to come up. I then bought a new charger (from a legit well-known store and they said it's the best quality) and it does the same thing. I haven't got a chance to borrow anyone's original note charger yet as I found no one using this device. And now I start to think it's the problem with my Note more likely than anything. I haven't tried to reinstall the firmware either as I just updated the firmware like few months ago.
I've been using it for about a year btw. Sorry for my English. And looking forward to hear from you all.

The usb jack or its solder contacts may be damaged. Also, if no case is used and the backside of the Note squeezed when holding it in your hands, the cables for usb and display may work themselves slowly out of their pcb connectors. I don't know if the squeeze theory is right, but definitely there are many loose cables...
A charger must be Qualcomm Quickcharge or Apple iPad compatible, 5v 2A. I haven't used a Sammy Charger for a single time,tho they seem just too good to throw away.

lecorbusier said:
The usb jack or its solder contacts may be damaged. Also, if no case is used and the backside of the Note squeezed when holding it in your hands, the cables for usb and display may work themselves slowly out of their pcb connectors. I don't know if the squeeze theory is right, but definitely there are many loose cables...
A charger must be Qualcomm Quickcharge or Apple iPad compatible, 5v 2A. I haven't used a Sammy Charger for a single time,tho they seem just too good to throw away.
Click to expand...
Click to collapse
Are you sure the Qualcomm Quickcharge would work on this P601? I checked the list before and I didn't see the Note 10.1. Not even the Note 3 which was released together. I afraid that being "not compatible" might fry the device.
If you're using one and not having any problem, can you post the link to the product that you're using and working well?

I forgot about the different SoCs. However, all models charge at 5v/2A and the signaling technique used for Quickcharge seems to be borrowed from that of the Apple iPad, the Exynos based models should be just the same. I plugged my Note into an Apple compatible charger, which was from a time when Android smartphones were charging at 0,9A and Android tablets had proprietory connectors, and it was charging at 2A.