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Hello,
I recently acquired an XDA 2 with broken terminal. I soldered a new terminal to it. It is synchronizing fine and charging from USB but it is not charging from main or car charger. Apparenlty all solders are OK and pinout are as they should be (accoring to other postings on this forum). Pins 20, 21, 22 are showing connectivity among themselves and to positive terminal of standard charger. Pins 16, 17 and 18 showing connectivity among themselves and to ground (and negative termial of charger adaptor).
I used more than one chargers and checked voltage. Everything seems OK.
Any idea where the problem may be?
Thanks for assistance.
If it's charging via mini-USB, you need a charging cable when charging from a non-data source. These differ from normal USB cables in so much as they have pins 4-5 shorted together.
As an alternative, try resetting the phone with the cable plugged in. Sometimes this is enough to false the circuit to initiate the charging sequence. This emulates what happens when charging via a PC's USB port.
hey
i have a broken conector two!But i am from romania and i can't find here to buy! how muxh was it?
http://forum.xda-developers.com/showthread.php?t=310441&highlight=himalaya+connector
this guy would know where you can get the connector and what it's partnr is
andreibbc said:
i have a broken conector two!But i am from romania and i can't find here to buy! how muxh was it?
Click to expand...
Click to collapse
Hi andreibbc,
I took the connector out of an XDA (with broken screen!). You may buy new replacement from ebay (see item number 260138794518) but it will require good soldering skills!
liquidsilver said:
If it's charging via mini-USB, you need a charging cable when charging from a non-data source. These differ from normal USB cables in so much as they have pins 4-5 shorted together.
As an alternative, try resetting the phone with the cable plugged in. Sometimes this is enough to false the circuit to initiate the charging sequence. This emulates what happens when charging via a PC's USB port.
Click to expand...
Click to collapse
liquidsilver, thanks for your prompt response.
By mini-USB do you mean some special connector? I do not see any mini USB connector in the phone itself. It is charging through sync. cradle using usb connection, irrespective of whether main charger is connected or not. If I remove usb connection from computer it stops charging.
Please advise how to reset the phone with cable plugged in? (I assume you are referring to standard main charging connector)
http://forum.xda-developers.com/showthread.php?t=242772&highlight=connector
this guide show how to put in a miniUSB connector to replace the
org buttom connector of the devices
Rudegar said:
http://forum.xda-developers.com/showthread.php?t=242772&highlight=connector
this guide show how to put in a miniUSB connector to replace the
org buttom connector of the devices
Click to expand...
Click to collapse
Thanks for your response.
Since original connector (after resoldering) is working fine except main charging, I would rather keep it.
I would prefer trying options that will keep the existing connector such as resetting phone (as suggested by some other member, how?) or finding the actual cause of problem (including short connectors)
Any assistance will be of help?
i'm not 100% sure what your issue is
if the device is no charging
the most plausble reason is
broken legs on the connector
or bad solvering to the pcb for the chargning pins
or wrong connections
http://wiki.xda-developers.com/index.php?pagename=Connectors
Rudegar said:
i'm not 100% sure what your issue is
if the device is no charging
the most plausble reason is
broken legs on the connector
or bad solvering to the pcb for the chargning pins
or wrong connections
http://wiki.xda-developers.com/index.php?pagename=Connectors
Click to expand...
Click to collapse
Let me restate the problem.
I got an XDA II with broken connector. I took connector from and XDA (all legs intact) and soldered it to XDA II. Apparently soldering is fine.
The set is now synchronizing fine and charging while synchronizing (through USB and not through main charger). If I remove USB from computer it stops charging even if the main charger remain connected to synchronizing dock.
As long as direct main charging or charging through car adaptor is concern, Pins 20, 21, 22 are showing connectivity among themselves and to positive terminal of standard charger and Pins 16, 17, 18 showing connectivity among themselves and to ground (and negative termial of charger adaptor). If I am not wrong these are two sets of pins that are needed to be connected for main charging. I have checked main adaptor and tried more than one adaptors with same result.
My questions are:
Is there any other pin that may be short (or not connected) that is causing main charging to fail?
Is there any other possible component failure and if yes, which one and how to check it?
If the main charging has some programming part associated with it, is it possible that a reset may restart charging? if yes, how?
I hope the problem is clear now.
Thanks for your assistance.
msu said:
Let me restate the problem.
I got an XDA II with broken connector. I took connector from and XDA (all legs intact) and soldered it to XDA II. Apparently soldering is fine.
The set is now synchronizing fine and charging while synchronizing (through USB and not through main charger). If I remove USB from computer it stops charging even if the main charger remain connected to synchronizing dock.
As long as direct main charging or charging through car adaptor is concern, Pins 20, 21, 22 are showing connectivity among themselves and to positive terminal of standard charger and Pins 16, 17, 18 showing connectivity among themselves and to ground (and negative termial of charger adaptor). If I am not wrong these are two sets of pins that are needed to be connected for main charging. I have checked main adaptor and tried more than one adaptors with same result.
My questions are:
Is there any other pin that may be short (or not connected) that is causing main charging to fail?
Is there any other possible component failure and if yes, which one and how to check it?
If the main charging has some programming part associated with it, is it possible that a reset may restart charging? if yes, how?
I hope the problem is clear now.
Thanks for your assistance.
Click to expand...
Click to collapse
Forgot to mention one thing which is that Pin 2, which according to connector diagram should be ground/ sensing is not showing connectivity with ground or with Pins 16, 17 , 18.
Does it affect main charging? and should I ground it?
Thanks
Hi. I've solved the problem of using other chargers with GT.
Like Apple, Samsung used a little trick with their chargers.
To charge your GT with any usb charger you have to make a little adapter.
Usb pinout:
gnd d- d+ 5v
To work you must short d+ and d-.
From 5v use a 33k resistor to d+/d-.
From gnd use a 10k resistor to d+/d-.
If you have multimeter you should obtain ~4v between 5v and d+/d-; and ~1v between gnd and d+/d-.
I tested it and it's working.
Hi, it's not a trick but a standard. You only need to short d+ with d-, the resistors are not needed. Just be sure that the charger outputs closest to 5v possible, around 5.2~3 usually work for everything. About 5.6v and it start not to work on some devices, like apple..
Maybe, I have to test that
I know it's not a trick, I should wrote "trick".
For example GT adapter outputs 5.31v.
Apple adapter worked with 1 22k resistor between d- d+.
WarlockM said:
Hi. I've solved the problem of using other chargers with GT.
Like Apple, Samsung used a little trick with their chargers.
To charge your GT with any usb charger you have to make a little adapter.
Usb pinout:
gnd d- d+ 5v
To work you must short d+ and d-.
From 5v use a 33k resistor to d+/d-.
From gnd use a 10k resistor to d+/d-.
If you have multimeter you should obtain ~4v between 5v and d+/d-; and ~1v between gnd and d+/d-.
I tested it and it's working.
Click to expand...
Click to collapse
WarlockM said:
To charge your GT with any usb charger you have to make a little adapter.
Click to expand...
Click to collapse
How can you do that? You need an extra device adapter? Please explain.
I've tested with d-/d+ shorted and it's not working.
@MizGarfield if u have 1 usb extension cable u can cut it on half.
Tie together white and green wires.
Tie black wires and conected to that 1 end of 10kohm resistor, the other end tie it to green/white wire.
Same to red wires but use 33kohm resistor.
See att. Sry for drawing.
bookmarking this for later use
WarlockM said:
I've tested with d-/d+ shorted and it's not working.
@MizGarfield if u have 1 usb extension cable u can cut it on half.
Tie together white and green wires.
Tie black wires and conected to that 1 end of 10kohm resistor, the other end tie it to green/white wire.
Same to red wires but use 33kohm resistor.
See att. Sry for drawing.
Click to expand...
Click to collapse
You don't need that for modern devices has i told you. It did not work because you did it wrong. I have all my usb chargers working the new way, you even have wikipedia talking about it. You have to cut the data + and - on the power supply from the female usb port and short only the female d+ and d-. Trust me it works and it is alot simpler.
Edit : from wikipedia "The Dedicated Charging Port shorts the D+ and D- pins with a resistance of at most 200 Ω. The short disables data transfer, but allows devices to detect the Dedicated Charging Port and allows very simple, high current chargers to be manufactured. The increased current (faster, 9 W charging) will occur once both the host/hub and devices support the new charging specification."
""As of June 14, 2007, all new mobile phones applying for a license in China are required to use the USB port as a power port.[35][36] This was the first standard to use the convention of shorting D+ and D-.[37]""
http://apple.slashdot.org/story/10/08/03/1743240/Hardware-Hackers-Reveal-Apples-Charger-Secrets
""We all love to call out Apple when they design deliberate incompatibility into their devices, but there is a perfectly valid technical reason for what Apple is doing here, and, in fact, they are following a USB specification (which LadyAda unfortunaterly didn't even test).
Without data communications or when suspended, devices may legally draw no more than 2.5mA from a host, which is useless for charging. In fact, even if you're generous and pretend they're connected, devices are not allowed to draw more than 100mA without negotiating for a higher current, which requires actually talking to the host, and 100mA is still too little to charge properly. 500mA is the maximum allowed by the USB spec, but devices must negotiate it (there may be too many devices on the bus for negotiation to succeed).
Before there was a spec for "dumb" USB chargers, Apple used the resistors as a sentinel to avoid drawing too much current from undersized chargers in order to avoid damaging the host. This is a hack, but it works, and honestly, we're smart enough to figure out a couple resistors on the data lines. It's not like they're using crypto auth on the charger. They have a perfectly valid reason to do this. Devices which charge from "dumb" chargers aren't following the spec, though this is a common industry practice.
As it turns out, the USB-IF came up with a USB Battery Charging spec [usb.org]. The spec is long and boring, but it boils down to: short together the data lines (no resistors required) and you indicate that you're a dumb charger that can supply anywhere from 0.5A to 1.5A.
Guess what happens when you short the data lines of an iPhone 3G and supply 5V [marcansoft.com]. Did Apple just follow a standard? Incredible!
(Yes, I'm not following the USB spec there by in turn using a USB cable to supply the 5V and not negotiating over its data lines. I didn't feel like grabbing a dedicated 5V PSU for the shot, so sue me.)"""
http://marcansoft.com/transf/iphonechg.jpg
ok ??? no need for resistors, only 5.3V MAX and d+ and d- shorted
Thnx for the tip gonna try this later on my sanyo eneloop power booster tried it yesterday without this mod and it doesn't charge so gonna look for a AF to AF converter and modify it to gound the D+ and D-
@adolfotregosa
I tried again shorting d-d+, with iphone it works but with GT it's not working.
I use BatteryWatch and it is saying Not Charging. It's detecting the connection like usb port but is not. I use some device build by myself with 1 amp capabilities. D- and D+ r free of any connection and i can do with them what i want.
I dont say you r wrong but it's not working with GT.
Sent from my GT-P1000 using XDA App
but smt is wrong on your custom setup, voltage ??
EDIT: i just measure the original charger and it has no resistance between the data and power pins.
I think i know what could be wrong, when you plug in the Tab and it says not charging, how many volts have you got at that time ?
The original charger is very good because when it not charging the tab it has 5.3x volts but when you plug it in it lowers to 4.8x V Max and that is very good ! most chargers tend to lower much more (bad quality or just not powerful enough) and that is what causes the not charging messages on the tab or other devices.
Well i rest my case on this.
My device with no load it have 5.21v and with load 5.03v so it's not from him and i have another supply 5v/12 amp and it's doing the same (not charging, only with data shorted).
When u r trying to measure the original ps u can read ~7k between gnd and data but from 5v to data u cant because it have some capacitors.
Maybe samsund did something else, i have to try, maybe data pins drawing some current (mA) and that's why it's not working with only shorting them.
For the moment it's the only (working) solution i've found and i'm happy with it .
P.S. If i'm not finding anything else the last resort will be to open the original ps
Sent from my GT-P1000 using XDA App
USB Charger
This is what worked for me.
Items Needed:
USB Extension Cable
33k-Ohm Resistor (Shack Part No. 271-1129)
10k-Ohm Resistor (Shack Part No. 271-006)
Steps:
1. Cut USB Extension Cable in half, lets name the 2 halves, the half you will plug into the power suppy will be called "Cable A" and the half that you plug into the Galaxy Tab Data Cable will be called "Cable B"
2. On 'Cable A" strip outer plastic to expose all wires within, eliminate Green and White on this cable only as it will not be needed, leaving you with only the Red and the Black Cables
3. On "Cable B" strip outer plastic to expose all wires within, this should leave you exposing all 4 wires
4. On "Cable B" strip both the Green and White wires and join thes 2 wires with the 2 resistor ends (you should be using the resistor ends that have the red band with these wires), these can be joined by either soldering or just twisting together.
5. Strip Red wire from both cables and join together with the 33k-Ohm Resister (this will be the larger of the 2 resistors and should also be the end with the Gold Band) and as well join these together with solder or just twisting together.
6. Repeat the above process with the Black wires and 10K-Ohm Resistor.
7. No finally use Electrical Tape or Shrink Tubing to cover all your work.
This worked using it on a Champtek 5v 2.1a USB Car Charger and Home Charger. Also worked with iPhone charger. Also works with Original Galaxy Tab.
Hope this helps out.
May I just ask some clarifying questions?
rick75204 said:
This is what worked for me.
...
4. On "Cable B" strip both the Green and White wires and join thes 2 wires with the 2 resistor ends (you should be using the resistor ends that have the red band with these wires), these can be joined by either soldering or just twisting together.
Click to expand...
Click to collapse
Does it matter WHICH resistor you join to which of these two wires?
rick75204 said:
5. Strip Red wire from both cables and join together with the 33k-Ohm Resister (this will be the larger of the 2 resistors and should also be the end with the Gold Band) and as well join these together with solder or just twisting together.
Click to expand...
Click to collapse
So that you have effectively bridged the red wire with 30K-Ohms to one of either green or white running to the TAB?
rick75204 said:
6. Repeat the above process with the Black wires and 10K-Ohm Resistor.
Click to expand...
Click to collapse
And bridged the black wire with 10K-Ohms to the other of either green or white running to the TAB?
Would this be an accurate picture, with the 33K Ohm Resistor on the left, and the 10K Ohm Resistor on the right?
I think the intention was that you short the green and white wires together: so you are connecting both wires to both resistors.
That way the two data lines are both held at a fixed voltage of about 1.2V
Thanks, that clarified it.
I noticed today that if I connect my Tab to my keyboard (standard Apple USB KB with keypad, connected to a circa 2006 iMac), the device started charging according to battery stats. When it was plugged in it was at 48% and it ended up at around 60% after a few hours. Am I being deceived or something? I was under the impression that it would only charge if connected to the mains charger. Well I guess I'll see how long it runs now it's off the leash and see if it lasts till the morning (left my charging cable at work - D'oh!).
No, it definitely does charge even when it says it isn't - just slowly. I've got a 2A non-official USB charger that charges it up pretty quick, but still says it isn't charging. If the screen is off, it will even charge off one of those tiny Kindle chargers that must be delivering less than 500mA, but *really* slowly.
Clarify
Sorry guys, only a clarification.
As far as i understood:
the GT DOES charge with *any* charger (or connection to PC);
if you use the original charger (2Amp), it charges showing the charging-icon;
if you use a non-original charger, it charges in any case but NOT showing the charging-icon and depending on the charger power (even 1Amp charges, or 500mAmp, *VERY-REALLY* slowly);
if you use a non-original charger with the two resistors (33k + 10k) it charges showing the icon (even with a 1Amp).
Can anybody confirm if i understood well?
Thanks!!
eiem said:
Sorry guys, only a clarification.
As far as i understood:
the GT DOES charge with *any* charger (or connection to PC); Yes but slower than the original charger
if you use the original charger (2Amp), it charges showing the charging-icon; Yes, exactly
if you use a non-original charger, it charges in any case but NOT showing the charging-icon and depending on the charger power (even 1Amp charges, or 500mAmp, *VERY-REALLY* slowly); Yes.
if you use a non-original charger with the two resistors (33k + 10k) it charges showing the icon (even with a 1Amp). Depends, i get various results even though i am using the mod since day 1.
Can anybody confirm if i understood well?
Thanks!!
Click to expand...
Click to collapse
Thats it for now.
It seems that the Tab could recognize the status of the usb connection by measuring the usb data rx/tx wire level. If it is not shorted, the "pluged in but not in charging" status will appear, as the mismatch voltage of the usb connection is made.
Sent from my XT701 using XDA App
Hi Friends!
If I want to charge my Defy with an original Motorola charger and data cable it doesn't charge. I tried to charge with a HTC charger and cable but it's the same
problem.
But if I connect the phone with an USB cable to my pc, it charges.
Any solution please!
more info please
more info please.
What ROM? original? version of android, etc...
If you are using a non-supported ROM maybe changing it to a official version could be a good idea.
it may sound stupid, but try rebooting the phone! mine did the same last week and i was just about to tear out my hair, then i rebooted the phone and all was well again. odd! i think i may have killed a process i wasnt supposed to
Defy charging problem
I use an official ROM 2.51.1. MB525.Retail.en.CEE
Reboot didn't help
I will try a factory reset
damn. actually this thread has reminded me of something, i found another usb charger adaptor the other day and it didnt work, so i assumed it was broken. im using my kindle usb charger adaptor + cable and its fine! maybe not all charger adaptors are the same?
by usb charge adaptor I mean you have a wall plug with a usb port on it, then you plug in your usb cable to that and phone? i assume thats what you mean as well
Yes I have a Motorola wall usb adaptor and a Motorola data cable to the phone. I got them with the phone. And I have got a HTC wall usb adaptor. Booth adaptors work fine
with my HTC phone (charge them).
Try charging phone when turned off. If not working remove batt for a few secs then put it back and charge . I do this with my wifes htc
Sent from my MB525 using XDA App
Hi salingpusa!
Thank you for hints.
Charging by power off doesn't work.
After battery removing and putting it back phone charges, but only at the first time. When I try to charge next time power on mode, it doesn't charge.
An observation: if the battery is almost empty, phone can charge from wall adapter.
Hmmm... Try doing a nan droid backup. Then wipe data, dalvik, and batt. If it works, good. then try to restore the back up. If the problem resurface, do wipe data, dalvik and batt but don't restore.If the problem is gone, ur good. Hope it works
Sent from my MB525 using XDA App
Thank You for your help. Updating to official Froyo CEE solved the problem
Actually there is a difference between USB-Chargers !
Hi,
i have an old Generic USB Car-adaptor which I used with the USB-Data Cable of my old LG KU990. Works fine...
Now I plugged my Defy with it´s Data Cable to that Generic-Adapter and the Defy didn`t recognise it.
So... I googeled^^
Before the EU had agreed on micro-USB as the future common connector for mobile devices there had been Generic USB-Power-Adapters which only connect +5V and Ground. This Generic ones only work on "old devices" and lame Devices like USB-lamps :-D
So whats the difference on the new Common External Power Supply?
They use also the D+ and D- Pins (~ 2V) ;-)
Look on the Schematics on MintyBoost (just "google" it).
So how to make an old Generic one work with new devices?
Just add some resistors (voltage divider) to put 3V on D+ and D- like in the Schematic at Mintyboost ;-)
The Voltages on D+ and D- are for the "power negotiation". It determines how many current the Device can get out of the Charger. The IPhone for instance has different modes
# D+ = 2V / D- = 2,8V => 1A (Quick charge on wall plug)
# D+ = 2V / D- = 2V => 0,5A (Slow charge on PC USB plug)
Some Devices such as Motorola Backflip needs to shorten D+ and D- (USB Charging Specification).
Is it really the work worth?
New one costs about 5 Euros...
But its a good hint
Thanks!
Not charge or change slowly?
If charge slowly with HTC charger,
Maybe something is wrong with your wall-charger.
I guess the reason why you can not use HTC charger as below:
As we all know,USB cable has 4 lines,VBUS,D-,D+,GND.
Charger need VBUS and GND.Votage of VBUS is 5V.
Some cell phone only needs VBUS and GND.D+,D- can just leave it floating.
But Defy use D+ and D- to distinguish Wall-charger and USB-charger.
If short D+ and D- in charger(make the votage of D+ is the same as D-)，Defy will know it's a wall-charger,so the current will rise up to 800mA.
If the votage of D+ and D- is not the same,Defy will know it's a USB-charger,so the current will down to 300~500mA.You will find it's so slow to change Defy full.
HugoHirni said:
Hi,
i have an old Generic USB Car-adaptor which I used with the USB-Data Cable of my old LG KU990. Works fine...
Now I plugged my Defy with it´s Data Cable to that Generic-Adapter and the Defy didn`t recognise it.
So... I googeled^^
Before the EU had agreed on micro-USB as the future common connector for mobile devices there had been Generic USB-Power-Adapters which only connect +5V and Ground. This Generic ones only work on "old devices" and lame Devices like USB-lamps :-D
So whats the difference on the new Common External Power Supply?
They use also the D+ and D- Pins (~ 2V) ;-)
Look on the Schematics on MintyBoost (just "google" it).
So how to make an old Generic one work with new devices?
Just add some resistors (voltage divider) to put 3V on D+ and D- like in the Schematic at Mintyboost ;-)
The Voltages on D+ and D- are for the "power negotiation". It determines how many current the Device can get out of the Charger. The IPhone for instance has different modes
# D+ = 2V / D- = 2,8V => 1A (Quick charge on wall plug)
# D+ = 2V / D- = 2V => 0,5A (Slow charge on PC USB plug)
Some Devices such as Motorola Backflip needs to shorten D+ and D- (USB Charging Specification).
Click to expand...
Click to collapse
Hi HugoHirni,
I use a multimeter test Defy wall-charger,D+ and D- is short.
So, I think D+=D- => Quick charge on wall plug.
My conclusion is different from yours
charging issues ..
i am using CM7 2.3.5 on my defy MB525..
its giving charging issues like
if i was using the phone for some download or web surfing or using some app. and the next secind if i plug in d charger then it wont take charging .. then i hav to leave it ideal for a minute or so
i even used another motorola charger and usb lead to resolve it , but it ain't working !! presently am using motorola charger and nokia usb for charging .. (the charger does get heated up pretty soon)
should i install d STOCK ROM and send the phone to service centre or any solutions !! kindly help ..
moto defy does not support defy plus batttery
moto defy does not support defy plus batttery.it shows 80% only
Please use the Q&A Forum for questions &
Read the Forum Rules Ref Posting
Moving to Q&A
Hello.
I m having a problem with my transformer. Right now it is charging slow as if it was connected to the computer and not the wall plug. Also the message "Connect your Charger" won't go out of the screen, even if it is connected or fully charged. I flashed a custom ROM to see if it fixed something, but I had no luck. The cable works fine to connect the transformer o my PC the only thing wrong is that is is not charging properly and the message won't go off. Do you have any idea of what could be happening? My wall charger is model OB-1LF, which I believe is not the one with the known fault. Any ideas?
the adapter is surely broken.
This will sound nuts but, put your wall charger in a plastic baggie [push out all the air and then seal the bag] and put it in your freezer compartment for say 3hrs. Take it out [still in the bag] and let the charger warm up to room temp.
The charger may now work. It is worth a try. You would be trying to be sure the thermal fuse inside the charger is reset. I brought one back to life that way.
hshoem1
the TF uses pin 7 in the USB connector to signal the charger to use the 15v output. If the charger does not see a gnd on pin7 it will only charge at 5V as ypou are seeing. Are you using an extension usb cable? If no then check the pins on the TF and cable for bent or damaged pins. Also try the freezer as the charger may have gone into safety reset.
Thanks for the answers. I will try the bag and freezer to see if it gets fixed.
I know that this freezer trick works (also with broken hard drives too apparently), but what's the physical reasoning behind it? I swear I've seen a good explanation of it before but I can't remember..
Same problem here... Even had the charger replaced but of no use. It does charge wth a different (do it yourself) charger usig the same cable.Maybe that doesn't have the 5v/12v mode or something...
Going to order a new adapter and hope thatll fix it otherwise I'll send the entire transformer for repair i guess :/
I just got one today (got a good price on Amazon)
it just will not charge, tried all the fixes! not too happy as i went for the asus over the ipad and apparently quite a few people have charging issues with it.
charges very slowly through my laptop
From reading posts on forums is sounds like a few people are having it and Asus should of recalled the charger.
phone call to Asus tomorrow
asdfuogh said:
I know that this freezer trick works (also with broken hard drives too apparently), but what's the physical reasoning behind it? I swear I've seen a good explanation of it before but I can't remember..
Click to expand...
Click to collapse
There is overtemp protection circuit that should reset once the charger cools, but apparently it needs to cool down past room temp. The freezer is cold enough to reset it. I would not buy a new TF charger search for devcakes discussion there several aftermarket chargers that work well
Check the cable. I had the same problem. At first I thought it was because of faulty charger and had it returned and got a new one from Asus, but still had the same issue. Then I returned the cable for a new one, it worked flawlessly.
A plus: Asus gave me new cable which was much longer than the original one.
the cable is fine, used it to charge via my laptop
I had the same issue with my charger. I called up Asus and was able to send it in for repair, after a couple days they mailed me a new charger and cable.
Sent from my Transformer TF101 using xda premium
mglancy23 said:
the cable is fine, used it to charge via my laptop
Click to expand...
Click to collapse
Charging with your laptop does not involve pin 7 and supplies 5V. If pin 7 or that conductor is bad or you use an incorrect USB extension cable, the pin 7 signal will not get to the charger and will not supply the 15V charge voltage for normal charge.
Rumbleweed said:
Charging with your laptop does not involve pin 7 and supplies 5V. If pin 7 opr that conductor is bad or you use an incorrect USB extension cable, the pin 7 signal will not get to the charger and will not supply the 15V charge voltage for normal charge.
Click to expand...
Click to collapse
Cheers will send the cable as well to be sure but am pretty confident its the power adapter.
Hopefully i will have an adapter for next week.
I had a brief play on it and i was quite impressed, the stock browser was surprinsignly good and may unistall dolphin.
I tried the freezer trick, but it didn't worked. I ordered another wall charger to see if it works. What's really weird about this is that the Connect your Charger message will not go off the screen. It doesn't matter if it has 100% charge it will still show "Connect your Charger".
In my case my Transformer didn't want to charge at all. The red light never came up while connected, the only way to fix it was to drain my Transformer all the way until shutdown and then plug it in and voila! It started charging again ever dince.
Great tips by the way!
Thanks
Sent from my Atrix 4G using Tapatalk
Just an update, after ordering a new adapter (with cable) it now works... Appearantly the cable was the problem afterall...
New cable with old charger = ok, new cable with new charger = ok, old cable with new charger = no go, old cable with old charger = no go.
And old cable with 3rd party adapter supplying 12V = ok, heh...
New cable is longer indeed, now I just need to think if I wanna go through the RMA process again for the old cable. But yeah, cable was the issue (out of nowhere btw).
dagrim1 said:
Just an update, after ordering a new adapter (with cable) it now works... Appearantly the cable was the problem afterall...
New cable with old charger = ok, new cable with new charger = ok, old cable with new charger = no go, old cable with old charger = no go.
And old cable with 3rd party adapter supplying 12V = ok, heh...
New cable is longer indeed, now I just need to think if I wanna go through the RMA process again for the old cable. But yeah, cable was the issue (out of nowhere btw).
Click to expand...
Click to collapse
The Pin 7 Connection I referenced earlier is bad. This prevents the charger from outputting 15V.
Rumbleweed said:
The Pin 7 Connection I referenced earlier is bad. This prevents the charger from outputting 15V.
Click to expand...
Click to collapse
Yeah, I read your posts about that... couldn't see anything wrong with it on the outside though (with my eye) so unfortunately no clearly bent usb-pins or anything.
Any tips on things I can check? Could easily be on the inside as well of course in which case I can just forget about fixing it. At least it still works with another (non asus) adapter.
Mine was also doing a slow trickle charge. I ended up getting a new charger, but found that the problem was with the cable, not the "wall wart". I can still use my old one with the new cable and works fine as well.
I would like to charge my SGT 7.7 with the normal USB cable it came with on my pc; however, due to its lower mA output (USB standard is 500mA). The standard adapter it came with has 2000mA (2A) output, hence it detects and charges. However, I do notice that the unit charges at 1A with my iPhone charger, perhaps just a bit slower.
Anything we can modify in the rom to enable force usb charging? there is such a way in SGT 10.1 but I can't find a method similar to it on my 7.7
it charges when the device is in a powered off state... but very slowly
onicrom said:
it charges when the device is in a powered off state... but very slowly
Click to expand...
Click to collapse
Yep, it does.
But I would like to keep my device on while charging...
it's very slow because device detect voltage in data line. check out adapter in ebay.
Sent from my GT-P6800 using xda premium
zoftdev said:
it's very slow because device detect voltage in data line. check out adapter in ebay.
Sent from my GT-P6800 using xda premium
Click to expand...
Click to collapse
Yeah understood.
I'm using the Galaxy Nexus USB charger and it works well (1A)
but the iPhone 4S charger does not (also 1A)
kazuni said:
Yep, it does.
But I would like to keep my device on while charging...
Click to expand...
Click to collapse
Mine still charges even with the red X on the battery icon. Albeit, very slowly, and only really when the screen is off. Not bad for just listening to music while I'm at work!
USB charge adapter
To charge your GT7.7 using a usb cable you need to have an adapter.
You can make an adapter from the below parts. See attached images of the end result.
user rick75204 explains it best below.
http://forum.xda-developers.com/showthread.php?t=845844&page=2
USB Extension Cable
33k-Ohm Resistor (Shack Part No. 271-1129)
10k-Ohm Resistor (Shack Part No. 271-006)
Steps:
1. Cut USB Extension Cable in half, lets name the 2 halves, the half you will plug into the power suppy will be called "Cable A" and the half that you plug into the Galaxy Tab Data Cable will be called "Cable B"
2. On 'Cable A" strip outer plastic to expose all wires within, eliminate Green and White on this cable only as it will not be needed, leaving you with only the Red and the Black Cables
3. On "Cable B" strip outer plastic to expose all wires within, this should leave you exposing all 4 wires
4. On "Cable B" strip both the Green and White wires and join thes 2 wires with the 2 resistor ends (you should be using the resistor ends that have the red band with these wires), these can be joined by either soldering or just twisting together.
5. Strip Red wire from both cables and join together with the 33k-Ohm Resister (this will be the larger of the 2 resistors and should also be the end with the Gold Band) and as well join these together with solder or just twisting together.
6. Repeat the above process with the Black wires and 10K-Ohm Resistor.
7. No finally use Electrical Tape or Shrink Tubing to cover all your work.
USB Charging
Hi Guys
I recently bought a "Samsung Charging Adapter" from power gorilla for use with their portable power packs.
It is a usb adapter which when used in line with the Samsung USB cable, charges my 7.7 while I am using it from a 500ma USB port on my MAC ....
Philip
This works great for $7, has a switch to go from data to charging
http://item.mobileweb.ebay.com/viewitem?itemId=160709394617
how do you force charge on Galaxy Tab 10.1??
razorwokid said:
how do you force charge on Galaxy Tab 10.1??
Click to expand...
Click to collapse
Wrong forum Look in 10.1 development forum, in the thread for pershoot's kernel. Or buy one of the cables mentioned above.
morkli said:
Wrong forum Look in 10.1 development forum, in the thread for pershoot's kernel. Or buy one of the cables mentioned above.
Click to expand...
Click to collapse
Thanks for the response
I have similar charging problem with the stock data cable, but I could be able to charge with a USB 2.0 mini USB cable with a Galaxy Tab to mini USB convertor as shown below.
And I even use an USB extension and it is charging up just fine.
I just ordered this
http://www.ebay.com/itm/Micro-USB-t...-Galaxy-Tab-P1000-7500-7510-730-/170969489675
for $2.99 I hope it works. The things we go through in order to be not price gouged..
I have an existing HDTV (HDMI) adapter and its charging well with the included usb data cable of 7.7. :good:
http://www.samsung.com/us/mobile/galaxy-tab-accessories/EPL-3PHPBEGSTA
Although if you don't have it, it's not practical to buy one just for your usb cable to work for charging.
kazuni said:
I would like to charge my SGT 7.7 with the normal USB cable it came with on my pc; however, due to its lower mA output (USB standard is 500mA). The standard adapter it came with has 2000mA (2A) output, hence it detects and charges. However, I do notice that the unit charges at 1A with my iPhone charger, perhaps just a bit slower.
Anything we can modify in the rom to enable force usb charging? there is such a way in SGT 10.1 but I can't find a method similar to it on my 7.7
Click to expand...
Click to collapse
also would like to know how to force charge via USB I have gigabyte mainboards that have special charging ports that have 3x normal power .. but still can not get them to recharge my galaxy note 2 while its being used :S
strangely my old laptop with USB Ver 1 .. recharges the phone when in use ...
using Ubuntu and unsure if its pc sided software issue or android related issue
The device will certainly charge slowly via USB, although the battery animation may not show it.
You may use other adapters etc, but I'm fairly sure they don't actually work due to kernel limitations. Changes may need to be made within the kernel (same as SGS2) to actually increase actual charging current. SGS2 was set at USB 450mA. I'm sure I've seen the mod while searching github kernel source code.
Some of the measurement apps out their are quite inaccurate, and I have only used as I guide.
You could use init.d script to set on boot, but anything larger than 450mA could be just placebo,.... unless kernel enabled....
If I'm wrong, please correct me.
Sent from my GT-I9300 using xda premium
Simple solution turn off ur tab then connect it to laptop/pc mac/imac it will charge normally
Sent from my GT-P6800 using xda premium
khanfuze said:
I just ordered this
http://www.ebay.com/itm/Micro-USB-t...-Galaxy-Tab-P1000-7500-7510-730-/170969489675
for $2.99 I hope it works. The things we go through in order to be not price gouged..
Click to expand...
Click to collapse
This is garbage. I had three of them and they all broke within a month.
This is what I use now. Built to last.
http://www.amazon.com/gp/product/B009I4HEOO/ref=oh_details_o01_s00_i00?ie=UTF8&psc=1