Hi, does TF101 G (B80) supporot BC 1.1 for charging ?
No it does not afaik, the TF101 needs to use the wall wart to get full speed on it's charging, I don't remember the exact number but it needs to trip past a certain # of volts to charge at full speed, the wall wart is 15V.
TY then bad luck because my mb p8p67 have bc1.1 capacity by his USB3 ports.
Envoyé depuis mon XT925
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Would this work for the Transformer? Works on iPad and cell phones but not the Xoom for some reason. Something about the Xoom needing a 12v port? I thought usb was usb, and it would charge no matter what...
http://www.amazon.com/ChargeBlock-8200mA-2-1amp-Portable-Battery/dp/tech-data/B004S5BCL4
I use a similar but smaller version for my droid x.
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Traanformers charger is rated at 15V @ 1.2 a
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jerrykur said:
Traanformers charger is rated at 15V @ 1.2 a
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It has two circuits, a 2.0A 5V circuit on the USB 2.0 standard pins and a 15V 1.2A circuit on the additional pins.
A standard USB charger would work, but it will only charge - and slowly at that - when the device is powered off.
This is the only sad thing to me at this point with the TF - impossible to get additional chargers!
Just a thought, but if you're spending almost £70 on a charger, why not get the dock instead? (assuming you don't have it already)
First of all: Yes, I did use the search function. Yes, I did use google. But No, I did not find an answer to my problem.
Hopefully you guys can help me:
I bought a TF101 a week ago - it is used and came without the charger nor a data-cable.
So I bought an datacable off amazon which worked fine. But as we all know a usb port has not enough power to charge the tablet.
After looking around the Internet I build myself an molex to usb adapter which worked like a charm.
But now I plugged in the cable and it's not charging anymore. (8h ago it worked fine)
The cable is fine (PC can still connect to the transformer).
The adapter is fine (multimeter is giving out 11.56V)
Now when I plug in the cable it gives me a picture of a nearly empty battery.
I tried resetting the tablet - no effect.
Anyone knows this problem? Or has an idea how to fix it?
Transformer details:
TF101-1B032A
Android 4.0.3
Kernel 2.6.39.4 [email protected] #1
Build number: IML74K.WW_epad-9.2.1.24-20120503
I think you should first bought the Asus original charger instead which guaranteed supplying 100% correct voltages and ampere to your tablet. Does it charge via PC USB port now?
11.56V isn't enough to trip the HV charge, you need at Least 12V.
Try the ASUS charger.
Thing O Doom said:
11.56V isn't enough to trip the HV charge, you need at Least 12V.
Try the ASUS charger.
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And the only way to confirmed this is by plugging the TF to PC via USB port and see if it still charging, or try the original Asus charger.
Using another adaptor with rating voltage safe to our TF doesn't guarantee it fit to the TF after all. There's always fluctuation in between the incoming and outgoing supply, and the transformer seemed to be a little sensitive to this tiny changes..
Sent from Transformer TF101 (B60) via XDA Premium HD
The cable could be faulty.
Mines was - and yes the pc still recognised the tablet when connected. Theres 4 pins in it compare to the usual 3 (i may stand corrected on that 1)
RMA confirmed this and Asus sent a new sync cable back.
Its maybe going to cost a few quid but as the rest of the guys have said - get an origional charger and cable.
Ok, first of all thank you for your help.
I would have bought a original Charger but could not find any in local stores nor amazon (.de) exept a traveller set which costs around 40€ (which is too way much)
I plugged the transformer (turned off) in my IPod wallcharger (5V1A) overnight and it charged.
Now I am really confused - why is it charging over the lower voltage output but not over the 12V?
//Edit:
Thanks to (the) Thing o Doom
I tried pluging the adapter to another powersource and it works. (I feel stupid to not tried this earlier) Seems like my mobile molex power supply is not fully working.
hyperkubus said:
Now I am really confused - why is it charging over the lower voltage output but not over the 12V
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It's the build in power protection preventing your TF from catching fire from over fluctuation voltages supply. In ASUS original charger, it maintain the right amount of output even with uneven input supply. And the ipod charger has it as well..
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As the title says.
I actually thought about this myself.
Lots of lithium single-cell devices (3,6~3,7v) can be charged by USB (5v) but the transformer has 2 cells in series (7,4v) so it needs a higher voltage charger, in this case Asus chose 15v.
Assuming the transformer is able to charge the battery with a very low current power supply, you could in theory connect a step-up converter to the USB port to convert from 5v 500mA to around 15v 100mA, but even if it worked properly it would take well over 30 hours to charge an empty battery. This is how car chargers work, they convert the 12v from the car into 15v to the tablet, but in this case the car is able to deliver as much current as the converter needs.
If you have an USB 3.0 port it is different, I think a standard USB 3 port should be able to source up to 900mA. There are also USB 3.0 ports capable of supplying 1800mA, this would probably allow the DC-DC converter to charge it at around 1/3 of the speed the transformer charger does it.
Because of the need for the converter (and because when I have both the tablet and the PC around I usually also have an AC plug), I ended up not building the converter.
It'll trickle charge but not much else, as stated above USB 3.0 works better, but still the best is the standard wall wart.
Thank you guys :good:
I read somewhere that galaxy tab 10.1 ( I assume it's as same as our TF ) can be charged through pc using a script file ( .sh ) but i'm not sure it'll does the same thing on our TF, Right ?
The galaxy tab probably can be charged via USB because it's battery pack is made of 2 lithium cells in parallel instead of 2 cells in series like the transformer.
When you place 2 cells in series you get twice the voltage and the same Amp/hour rating. In the case of the transformer we have two 3,7v 3300mAh cells in series, this means the battery pack is rated at 7,4v and 3300mA. The samsung has two 3,7v 3500mAh in parallel, this means the samsung battery pack is rated at 3,7v 7000mAh. Because the samsung battery pack is rated at 3,7v it can easily be charged via USB, although very slowly, a 7000mAh battery being charged at 500mA will take more than 14 hours to charge (7000/500 = 14 + losses).
Here is the Galaxy Tab's battery:
[techrepublic.com]
And the Transformer's:
[techrepublic.com]
If you are willing to engage in a little hackery, you can get 12v from the power supply. The danger is that if you mod a usb jack, it could fry your zune if you accidentally plug it in. I think it's the black and yellow wire instead of the black and red.
sent from my transformer
Gee one, I'm going to look that up, if it's possible, I'm doing it. XD
It will probably work, at least there are people on youtube claiming they charge their transformers at 12v, the difference between 12 and 15v is not great and 12v should provide enough headroom to charge the battery pack but if it was me I would still place a step up converter between the transformer and the PC power supply to get 15v instead of 12v.
The reason for this is that it would probably be cheaper for Asus to just use a 12v AC-DC adaptor, they went for a custom 15v one for a reason (I don't know what that reason is), but I would recommend charging at 15v.
If you don't know how to make one of those, just buy a car charger for the transformer on ebay and "steal" the circuit. These car chargers are designed to get between 10 and 16v from the car and converting it in a steady 15v, they also usually are capable of delivering close to the 1200mA rated in the original asus charger.
Oh, and for the "inexperienced adventurers", before applying power always make sure (as in double or triple-check) you don't have wires swapped, I don't know how tolerant these things are to reverse polarity or if the USB data lines (3,3v) of the transformer would tolerate 15v.
My TF101 is not chranging, whether I plug it to a PC, or to an AC connector...please help me, I don't know what to do...://
I took these pictures while the TF was plugged into the AC Connector...I'm using EOS4 4.2.1 ROM, but the problem started when I bricked it and then installed the original 4.0.3. (US epad user 9.2.17). My PC recognizes the TF as storage, but doesn't charge it...I need help fast please, any helps are appriciated...:crying: It only charges in APX mode, but really slow, like I put it on the charges for a whole night and it was 18% in the morning...
View attachment 1745914
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Ok, the issue is that it will NEVER charge properly off of USB. Yes, it has a USB connector, but the Asus Wall Wart actually uses 15 VDC @ 1.2 Amps to charge. A typical USB on a PC is 5 VDC @ 0.5 Amps.
The wall wart will charge at 5 VDC @ 2.0 Amps if it does not detect an Eee pad connected. Also, if you use a USB 2.0 extension cable to charge, it will charge slowly and not show charging because the wall wart does not detect an Eee Pad (you need to use a USB 3.0 extension cable)
Charging off of traditional USB is at a rate of about 3% per hour with the screen off. Charging with the wall wart is approximately 35% per hour with the screen off.
frederuco said:
Ok, the issue is that it will NEVER charge properly off of USB. Yes, it has a USB connector, but the Asus Wall Wart actually uses 15 VDC @ 1.2 Amps to charge. A typical USB on a PC is 5 VDC @ 0.5 Amps.
The wall wart will charge at 5 VDC @ 2.0 Amps if it does not detect an Eee pad connected. Also, if you use a USB 2.0 extension cable to charge, it will charge slowly and not show charging because the wall wart does not detect an Eee Pad (you need to use a USB 3.0 extension cable)
Charging off of traditional USB is at a rate of about 3% per hour with the screen off. Charging with the wall wart is approximately 35% per hour with the screen off.
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So I need to buy an original Wall Wart? I have a new VivoTab Smart and and I used its adaptor to charge...it's not good? So it'll cahrge with the original? I hope...
Mazseex said:
So I need to buy an original Wall Wart? I have a new VivoTab Smart and and I used its adaptor to charge...it's not good? So it'll cahrge with the original? I hope...
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Correct. Most tablet chargers are either 5 VDC @ 1.0 A or 5 VDC @ 2.0 A. Both of those will charge it, but slowly and only with the screen off.
You can also look at the Caseen website, they have some options for Asus Eee Pad wall chargers if you do not have your wall wart.
frederuco said:
Correct. Most tablet chargers are either 5 VDC @ 1.0 A or 5 VDC @ 2.0 A. Both of those will charge it, but slowly and only with the screen off.
You can also look at the Caseen website, they have some options for Asus Eee Pad wall chargers if you do not have your wall wart.
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Click to collapse
Oh, Thank's a lot So I'll buy one
Your issue will be the cable (im at least 75% sure) same thing happened to me, would only trickle charge from ac/usb (yet data connection was fine), problem was fixed with a new cable. id get just the cable and test it first as the wall warts can be a bit pricey.
As I also have a N7 I was wondering if could use my N7 USB charger with my phone even if it's a 5V 2A compared to the 5V and 1A of HTC charger and without danger and without make my battery burn
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Yes you can. I do it all the time.
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