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[Q] TF101G - Charging issues

Hi all,
Sorry in advance if I'm asking for something that has been answered before.
I have seen lots of threads that talked about the Asus Transformer tf101 and tf101G that doesn't charge correctly.
My TF101G stopped charging after it was fully drained after the kids played some games on it. When I plugged it in to charge the TF screen came on with a big battery indicator which showed a empty battery with red at the bottom. Then it just goes off. When trying to switch on again it just briefly flashes this battery and goes off again.
I left the TF to "charge" overnight and this morning after about 6 hours of charging it had +-14% battery life.
So it appears that the charger still trickle charges the TF when it completely off, but doesn't want to charge when it powered on.
Also, the TF recognizes the cable when it gets plugged in. If off and with some power in the battery the TF starts to boot up, but no charge indicator is showed when booted and battery drains as per normal.
Could it be that this is a software issue? I would guess not, but then again I ask myself if the charger or USB cable was broken then it wouldn't trickle charge. right?
Anyone came across this yet?
I know that some people suggested the freezer trick, but I don't want to do that before I checked on this with the community members here.
Many thanks in advance for your assistance and sorry again if I missed a similar thread.

Hhunted said:
... but then again I ask myself if the charger or USB cable was broken then it wouldn't trickle charge. right?
Click to expand...
Click to collapse
It could. The charger cable got 2 red wires thats connected to the same point on the TF.
One of the wires is your normal +5v USB power, while the other is connected to a USB3 pin to tell the charger to spit out 15V instead of 5V.
If that particular cable is broken, the charger will only send 5V.
The odds that that small wire is broken though, is... well, very slim.

[Q] Tablet and Dock not charging - cable is OK _ Wall charger fail [Solved]

Hi there!
I have a B80 Tablet which was working properly as it should, until on Wednesday I left it completely dry (both dock and tablet 0%) and now they won't charge at all!
The wall charger and cable were tested with my friends TF101 - working fine, no problems at all.
Also when I turned on in the evening it showed the Battery (with red status) icon which means it needs to be charged - I put it on the wal charger for 3 hours and the dock was not charged at all, and the tablet got 3% juice and that was it.
Neither the dock or tablet is charging - tried them separately
Also tried cold-boot, the "freezer trick", the USB trick - no success
Any suggestions? Experience?
Thanks!
P.S: 3.2.1 HC, KRAKD ROM, default kernel, no OC

Mine is doing something similar. Tablet will charge but keyboard won't. If I leave tablet connected to keyboard I will draining completely in less then 4 hours. I have the OG Transformer 101.
ICS (revolver tf101 4.0.0 RC1 with stock kernel)
Sent from my Galaxy Nexus using Tapatalk 2

Now I managed to get the tablet to 9% Via USB Port -.-
Also tested my friend's charger which works as well - but mine does not want to charge...

Ive got exactly the same problem with one exception, i am not able to charge it at all!! After all night connected to charget still 0% battery, in dual batter widget there is unknown battery error. Charger is ok. Dock is fully chargedand even from dock my tablet wont charge.
What is more i am not able to flash stock rom with nvflash, it disconnects after sending bootloader.
Do you have any ideas what to do now?
Sent from my Transformer TF101 using Tapatalk 2

I sent email to Asus on Friday and waiting for response.
Sent from my Galaxy Nexus using Tapatalk 2

Just a few questions:
I plugged the dock on the wall charger without the tablet - it shows no life signs. Isn't the LED should be blinking? Also left the tablet on the wall charger for 2 hours and the battery was charged a bit (10%) - so it can't be the charger.
Also since it got a little charge - it can be hardware error with the battery. A loose cable?
Also managed to go back to stock ROM and no help - can it be that the cable has issues?
Battery voltage shows 7V BTW currently

Have you guys try using PC USB port alone and charge the tablet for like a day?
Put the tablet OFF and let it charge thru the day(12hrs) and see what happen.
Next, dock the tablet to it's keyboard and fire up. Go to settings - Developer options - USB debugging(uncheck).
Go to Settings - Asus customised setting - MobileDock Battery mode(uncheck).
Still docking, now restart the TF101.
And yes, the dock would blink when charging take place until it turn green when full charged..

Just tablet wouldn't charge
I have a similar same issue. It was working fine and then when i went to pick it up to use it wouldn't start up. So I followed all the tips i can find so far but no dice. Here are the rest of the info:
The unit will not turn on if I don't have the power cable plugged in.
1) When the cable is pulled out, the unit turns off and will not turn back on
2) When the cable is plugged in, it turns on and work just fine
3) When I put it on the keyboard dock, it turns on and work just fine
4) When I pull it out of the keyboard, it turns off and will not turn back on
5) I have soft reset, hard reset and factory reset (all with power plugged in) because nothing will happen without the power plugged in
6) Battery status shows 86% but not charging:
--When plugged into the wall
7) Battery status shows 86% but not charging while in the dock.
--The dock battery shows that it is charging and the light on the dock is green
I have tested and knows the charger works and the dock battery works.
The main unit battery will not deplete and will not charge.
What do I need to do?

bghlim said:
I have a similar same issue. It was working fine and then when i went to pick it up to use it wouldn't start up. So I followed all the tips i can find so far but no dice. Here are the rest of the info:
The unit will not turn on if I don't have the power cable plugged in.
1) When the cable is pulled out, the unit turns off and will not turn back on
2) When the cable is plugged in, it turns on and work just fine
3) When I put it on the keyboard dock, it turns on and work just fine
4) When I pull it out of the keyboard, it turns off and will not turn back on
5) I have soft reset, hard reset and factory reset (all with power plugged in) because nothing will happen without the power plugged in
6) Battery status shows 86% but not charging:
--When plugged into the wall
7) Battery status shows 86% but not charging while in the dock.
--The dock battery shows that it is charging and the light on the dock is green
I have tested and knows the charger works and the dock battery works.
The main unit battery will not deplete and will not charge.
What do I need to do?
Click to expand...
Click to collapse
Ive done exactly the same tests, and behaviour of my tablet is almost the same (battery 0%)
I am waiting for a responce from Asus.
Honestly speaking i am glad to hear that someone else has the same problems and the same symptoms. It means that the Asus hardware or ICS update messed something up.
Sent from my GT-I9000 using Tapatalk 2

I hope ASUS says something, becuase this is driving me crazy - out of the blue suddenly not working.
I charged the tablet via USB overnight - 46% right now, but the dock does not want to go up from 0%
And it looks like it charges via the wall charger as well, but it is the same as via USB - so the "real" charging is not triggered.

Fixed!!!
Looks like the wall charger charged with 5V, but not with 15V properly - which is utterly strange.
Waiting for a new replacement charger - with 12V 1A should be working.
BTW, if you want to do this, there are already threads.
You need a Molex Female and a USB Female cable - wire it like on the picture.
Yellow cable from Molex to USB red and the black cable from Molex (next to the red) to USB Black - that's it.

Great that it works for you but I don't think that is my problem though. I can't get it to trickle charge from the USB even. And the battery widget said "battery health = unknown error".
I guess I will still wait...

bghlim said:
Great that it works for you but I don't think that is my problem though. I can't get it to trickle charge from the USB even. And the battery widget said "battery health = unknown error".
I guess I will still wait...
Click to expand...
Click to collapse
+ 1
My charger is 100% good (tested on my friends tablet). Besides it should charge from dock but it doesnt!
Still waiting for asus responce.
Sent from my GT-I9000 using Tapatalk 2

GOOD NEWS! Tired this and keyboard showed 99%. I will need to run power down and try to charge later to see if fixed completely.
Now for what I did.
Took the base AC charger from my Galaxy Nexus, any base should work, then used the standard USB cable that came with the Transformer and plugged it into the AC charger and the keyboard dock without tablet attached. Plugged into the wall and got nothing. No lights or anything. Then switched back to the AC charger base that came with the Transformer. Plugged into wall and I got a green light on the keyboard dock so I then docked the tablet. The dual battery widget showed 17% tablet and 99% dock. At last check it was 27% tablet and 99% dock.
Hope this is a fix.
Sent from my Galaxy Nexus using Tapatalk 2

davebugyi said:
Fixed!!!
Looks like the wall charger charged with 5V, but not with 15V properly - which is utterly strange.
Waiting for a new replacement charger - with 12V 1A should be working.
BTW, if you want to do this, there are already threads.
You need a Molex Female and a USB Female cable - wire it like on the picture.
Yellow cable from Molex to USB red and the black cable from Molex (next to the red) to USB Black - that's it.
Click to expand...
Click to collapse
Hi davebugyi, so if I understand correctly, the solution is to use a 12V 1A USB charger to revive the battery of a dead dock? I have the issue as per my post here
Needless to say the dead dock battery is driving me mad!! Even opened up the dock and flipped the battery switch inside!!

jthompson0019 said:
GOOD NEWS! Tired this and keyboard showed 99%. I will need to run power down and try to charge later to see if fixed completely.
Now for what I did.
Took the base AC charger from my Galaxy Nexus, any base should work, then used the standard USB cable that came with the Transformer and plugged it into the AC charger and the keyboard dock without tablet attached. Plugged into the wall and got nothing. No lights or anything. Then switched back to the AC charger base that came with the Transformer. Plugged into wall and I got a green light on the keyboard dock so I then docked the tablet. The dual battery widget showed 17% tablet and 99% dock. At last check it was 27% tablet and 99% dock.
Hope this is a fix.
Sent from my Galaxy Nexus using Tapatalk 2
Click to expand...
Click to collapse
Thanks so much for this. This just happened to me too and was tearing my hair out why it wouldn't charge. Done trickle usb charge for 5 min from my phone plug and then plugged normal charger in again and instead of 0% it was at 33% and is now charging again.

Hope This helps
I had this problem for so long, that i even gave up on looking for fixes.
the problem was that i remember dropping my adapter accidentally, so it became loose. but I didn't know this, I thought the cable was faulty. so simple fix...if your adaptor is loose, try fitting it in place.
sorry for my bad sentence structure and bad description, hope it helps

[Q] Problem with charger

Hello,
I didn't use my tablet since 2 month and last week, i installed team EOS 4.2.2 JB rom.
After, my cable did'nt worked, When i tried to conect it to my computer, there was an error message that the tablet wasn't detect correctly.
And when i put the cable into the charger and the table to charge on the wall, i saw the icon on the right corner of the tablet charging but in the information battery, i sax that "Disconect" and the tablet % didn't grow up.... So i thought the cable was dead and i bouth one new on ebay.
With the new cable, no problem the tablet was detect and the charging with the charger was good. But after 2 days, i had new problems.
when i conect the tablet on my laptop, all is OK, the tablet is detect normally. But whn i try to charging with the charger on the wall, the tablet doesn't charge. I see the icon in the right corner is charging but in the battery informations, i see "disconect" again and the battery doesn't charge.
Yesterday, i saw a topic that i can put the charger on the freezer, i put it alle the night and i tried this morning but nothing the tablet does'nt charge.
On the charger, there is 2 parts, I open the little part with removing a screw and i tried to little move the 2 metal parts but nothing alwas the same problem.
So i think now the problem is not the new cable but the charger.... I know it's a specific voltage and if i try with my HTC ONE X charger, this will not work...
But maybe it's a problem with the tablet connect port?
I changed the rom and i installed the Cyanogen 4.2.2 this morning, and now when i conect the cable, with the computer, it's OK i see my tablet but the icon on the table isn't charging and i see "disconect in the battery information". And with the charger wall, it's the same, i have charge icon and i have disconect in the battery information
Do you think i must buy a new charger?
Sorry for my poor English my French

Try a trickle charge from the USB PC > Tablet
Plug the tablet cable into PC USB port and turn off the screen, then leave to trickle charge overnight
If you have the screen on it will not charge, so best to leave it off for a few hours to test if it is a charger problem

*Detection* said:
Try a trickle charge from the USB PC > Tablet
Plug the tablet cable into PC USB port and turn off the screen, then leave to trickle charge overnight
If you have the screen on it will not charge, so best to leave it off for a few hours to test if it is a charger problem
Click to expand...
Click to collapse
I Tried to connect PC USB > tablet with the screen turn off. It's not work
I tried to PC USB > tablet turn off and it's not work too...
the problem is the charger connextion on my tablet?

kevin761 said:
I Tried to connect PC USB > tablet with the screen turn off. It's not work
I tried to PC USB > tablet turn off and it's not work too...
the problem is the charger connextion on my tablet?
Click to expand...
Click to collapse
When you use PC USB to charge, it will not show charging on the screen, you have to leave it overnight for best test results
The freezer trick should only be used for about 20 minutes just to cool the charger down and reset the cutout
Try trickle charge overnight, if it works, its the charger

I think this is because tablet use a lot of power when in use and that is why the tablet is discharging when you use it. PC has even less powerful USB charger so the tablet will probably be recharging VERY slowly or even discharging when you use it.
You should leave tablet overnight to recharge and it is better to charge it in one piece than constantly plugging and unplugging it from PC.
Have a nice day,
Žiga

ZigaG said:
I think this is because tablet use a lot of power when in use and that is why the tablet is discharging when you use it. PC has even less powerful USB charger so the tablet will probably be recharging VERY slowly or even discharging when you use it.
You should leave tablet overnight to recharge and it is better to charge it in one piece than constantly plugging and unplugging it from PC.
Have a nice day,
Žiga
Click to expand...
Click to collapse
You should be able to charge and use it at the same time with the actual charger plugged in, but you are correct, with the PC you can not use and charge unless you mod your USB ports for extra power

Ok i will try to conect the tablet (power off) all the night to my computer but i think it will not charge...
And if it's not work, it's not a problem with the cable because i can use the cable to transfer media PC> Tablet, so it's a problem on the tablet connector?

Hello,
My tablet was charging all the night. She was at 22% and now 38.... It's very slow!!! But now, i know that my tablet and my cable are OK and my charger is the problem.
There is a solution to repair my charger or i must buy an other?

I'm searching to conect an old cable to my charger for rc cars. Whith my charger rc car, i can charge Nimh, Nicd and lipo accus.
I cutted an old cable for tf101. I think it's a USB 3.0 because i have 5 little cables.
I think i need to charge at 15V-1A... But i wouldlike to know what are the colors of negative and positive cable because in my TF101 cable i have this colors:
white-green-red-orange-yellow...

kevin761 said:
I'm searching to conect an old cable to my charger for rc cars. Whith my charger rc car, i can charge Nimh, Nicd and lipo accus.
I cutted an old cable for tf101. I think it's a USB 3.0 because i have 5 little cables.
I think i need to charge at 15V-1A... But i wouldlike to know what are the colors of negative and positive cable because in my TF101 cable i have this colors:
white-green-red-orange-yellow...
Click to expand...
Click to collapse
http://forum.xda-developers.com/showthread.php?t=1087321

Try this, separate charger and its pins, then take it along with the cable and put it in a zip pouch, now freeze for say 2 hrs. Take it out let it return to normal temperature and then try charging. Remember freeze them in a zip pouch (air tight)
Sent from my Transformer TF101 using xda app-developers app

A510 won't charge

Since last night my a510 won't charge at all. There was a thunderstorm and a power cut and the charger was connected to the socket (a multi socket with several other items including a phone charger) but not to the tablet. When I plug it in now there's no indication that it is charging and the battery keeps going down. I tried with the phone charger also and a USB cable on the PC. While I know at best this would charge the tablet in 24 hours or so there was again not sign of charging at all.
Is it still most likely to be the Acer charger that's at fault or is there something else I could try?

pickarooney said:
Since last night my a510 won't charge at all. There was a thunderstorm and a power cut and the charger was connected to the socket (a multi socket with several other items including a phone charger) but not to the tablet. When I plug it in now there's no indication that it is charging and the battery keeps going down. I tried with the phone charger also and a USB cable on the PC. While I know at best this would charge the tablet in 24 hours or so there was again not sign of charging at all.
Is it still most likely to be the Acer charger that's at fault or is there something else I could try?
Click to expand...
Click to collapse
edit: turns out it does trickle charge with a normal USB charger even if the charge light doesn't come on. Seems to be really hard to find a replacement for these though.

pickarooney said:
edit: turns out it does trickle charge with a normal USB charger even if the charge light doesn't come on. Seems to be really hard to find a replacement for these though.
Click to expand...
Click to collapse
12V, 1.5 Ampere, I believe just about any electronics outlet should have something in stock. Original would be better, true. Get a surge-protected multisocket if your area is prone to bad weather.

Luther Blissett said:
12V, 1.5 Ampere, I believe just about any electronics outlet should have something in stock. Original would be better, true. Get a surge-protected multisocket if your area is prone to bad weather.
Click to expand...
Click to collapse
The problem is the MicroUSB port on the tablet has an extra connector so I don't think it will be possible to use a normal microUSB cable with a 12V adapter.

pickarooney said:
The problem is the MicroUSB port on the tablet has an extra connector so I don't think it will be possible to use a normal microUSB cable with a 12V adapter.
Click to expand...
Click to collapse
I tried with another adaptor which has the right shape and 12V output and is supposed to be compatible but not joy. It might be the tablet itself but it's weird if it just stopped working overnight.

warranty
pickarooney said:
I tried with another adaptor which has the right shape and 12V output and is supposed to be compatible but not joy. It might be the tablet itself but it's weird if it just stopped working overnight.
Click to expand...
Click to collapse
I had the same problem, after 2 month my charger was dead. I Contacted ACER send in the tabled and got a new charger in about 1 week.
You need 12 Volts for Charging 5 Volts want Charge your Battery fully.

[Q] tf700t and dock charging problems

I have searched through the forum and tried all suggestions found, attempted to charge using a wallwart (known to be good) and USB (cable known to be good). Some background: last fall I was trying to flash the ROM and it got stuck in a boot loop. As I was visiting my wife in Taiwan (she teaches at a university there), I decided to take it to ASUS to have it looked at. They diagnosed a bad motherboard and replaced it, but not in time for me to take it home. It could not be shipped back because of the expense of shipping a lithium battery powered product was $$$$$. She brought it back with her and the battery showed as 80% charged (but the dock was out of juice).
I attempted to charge it normally, and nothing would charge, the tablet kept losing charge. I then attempted to charge just the tablet with the wall wart, and it would not charge. I tried a cold boot- no change. I tried turning off the tablet and charging it via the usb port of my powerbook overnight, and it did charge (not completely) and I then tried to finish charging it with the wall wart. It would not take a further charge. I am now attempting to bring it to a full charge via the usb port.
I tried charging the keyboard/dock via the usb port of the powerbook overnight, and it did not seem to charge. The keyboard will input to the tablet when connected, though, but there is no indication that the dock battery is active at all.
At this point, I am at a loss as to how to proceed. I suspect that the battery died for lack of a charge for such a long time (end of November to January 12) and that it must be replaced, but I am eager for some feedback from more experienced hands.
I also want to get it up and running on lollipop, but that will have to wait until this is resolved.
TIA!

nycellist said:
I have searched through the forum and tried all suggestions found, attempted to charge using a wallwart (known to be good) and USB (cable known to be good). Some background: last fall I was trying to flash the ROM and it got stuck in a boot loop. As I was visiting my wife in Taiwan (she teaches at a university there), I decided to take it to ASUS to have it looked at. They diagnosed a bad motherboard and replaced it, but not in time for me to take it home. It could not be shipped back because of the expense of shipping a lithium battery powered product was $$$$$. She brought it back with her and the battery showed as 80% charged (but the dock was out of juice).
Click to expand...
Click to collapse
So they charged it at the repair facility?
I attempted to charge it normally, and nothing would charge, the tablet kept losing charge. I then attempted to charge just the tablet with the wall wart, and it would not charge. I tried a cold boot- no change. I tried turning off the tablet and charging it via the usb port of my powerbook overnight, and it did charge (not completely) and I then tried to finish charging it with the wall wart. It would not take a further charge. I am now attempting to bring it to a full charge via the usb port.
Click to expand...
Click to collapse
Wallwart: How do you know it is good? Is it original Asus? Most usb chargers put out 5v, this tablet needs 15v. If you charge via PC USB port it's 5v, called a trickle charge and takes forever. Not even LEDs come on although it charges very slowly.
I suspect the wallwart or - if the cable is not original - the USB cable (even if it works with other devices).
I tried charging the keyboard/dock via the usb port of the powerbook overnight, and it did not seem to charge. The keyboard will input to the tablet when connected, though, but there is no indication that the dock battery is active at all.
Click to expand...
Click to collapse
"No indication" meaning you do not see the dock battery icon in the notification bar?
By design the tablet gets charged first, then the dock battery. If you do this at 5V, you'll wait 'til kingdom comes...
At this point, I am at a loss as to how to proceed. I suspect that the battery died for lack of a charge for such a long time (end of November to January 12) and that it must be replaced, but I am eager for some feedback from more experienced hands.
I also want to get it up and running on lollipop, but that will have to wait until this is resolved.
TIA!
Click to expand...
Click to collapse
Take the combo to a store, ask them to use a original Asus charger. The dock battery may be busted, but my money is on the wallwart.

Thanks for your reply, I appreciate it!
berndblb said:
So they charged it at the repair facility?
Yes
Wallwart: How do you know it is good? Is it original Asus? Most usb chargers put out 5v, this tablet needs 15v. If you charge via PC USB port it's 5v, called a trickle charge and takes forever. Not even LEDs come on although it charges very slowly.
I suspect the wallwart or - if the cable is not original - the USB cable (even if it works with other devices).
I charged my phone with it (iPhone 5, charged fully in the normal amount of time. I have a multimeter if that would help. I tried 2 different usb cables, both of which worked with the tablet for a slow charge via usb
"No indication" meaning you do not see the dock battery icon in the notification bar?
By design the tablet gets charged first, then the dock battery. If you do this at 5V, you'll wait 'til kingdom comes...
Correct, I saw only one battery indicator, which, seems like it is the tablet, as the same data appears undocked
Take the combo to a store, ask them to use a original Asus charger. The dock battery may be busted, but my money is on the wallwart.
Click to expand...
Click to collapse
I see little point in that, under the circumstances. I have charged the table 100% via the usb cable, I will see if it now accepts a charge from the wallwart.

nycellist said:
Thanks for your reply, I appreciate it!
I see little point in that, under the circumstances. I have charged the table 100% via the usb cable, I will see if it now accepts a charge from the wallwart.
Click to expand...
Click to collapse
It won't. Not from a wallwart for an iPhone. You need a charger that outputs 15v.
If your battery icon doesn't show (even if it's empty) you either have a problem in the dock connector or the battery is totally dead. I think you'll find instructions to replace it on ifixit.com

berndblb said:
It won't. Not from a wallwart for an iPhone. You need a charger that outputs 15v.
If your battery icon doesn't show (even if it's empty) you either have a problem in the dock connector or the battery is totally dead. I think you'll find instructions to replace it on ifixit.com
Click to expand...
Click to collapse
the wallwart was the Asus one that I charged the iphone with (not the iphone one), that is how I tested it. the iphone supposedly draws 12W, BTW