Related
I'd heard some people mention that they had been getting little electric shocks from the TF while plugged in. I experienced this a few minutes ago with the TF plugged into my dock which was plugged into the charger. I think I found out why...
I got my multimeter out and connected the negative to my house's ground. Then I held the other probe to the shield on the HDMI connector on the TF. This should be chassis ground, the same ground you come into contact with when you touch any of the metal. I measured about 62V between what should be about neutral potential and earth. This is the voltage you feel, since 62V is above the breakdown voltage of skin. Fortunately it doesn't seem to be much current since people aren't getting knocked on their asses.
I also noticed that the plug isn't polarized, so I turned it around and did the same check. Only about 5V this time, safe and consistent with what I'd expect between neutral and ground. When plugged in like this, the wide side (neutral) on mine is on the same edge of the adapter as the "S" in ASUS right above the USB connector.
ASUS should be able to fix this with a modified USA plug adapter that has a polarized (wider neutral) prong. For now, even if you're not getting shocked, plug the adapter in with the "S" lining up with the wider prong on the outlet. That is, if you're plugging it into a standard 3-prong with the round ground prong facing towards the floor, plug it in so that the "ASUS" on the end is upside-down.
pix below.
Interesting finding. We should get this on the issue list for Asus to take a look at.
Interesting. Thanks for finding this. It sounds like the power supplies should be recalled or at least a polarized plug sent to all US owners before someone gets hurt. I hope someone at Asus is listening.
One question though. Shouldn't the difference between ground and the neutral be zero?
jerrykur said:
One question though. Shouldn't the difference between ground and the neutral be zero?
Click to expand...
Click to collapse
Not zero, but probably less than 5V. The same circuit measures about 700mV between neutral and ground. I don't know what it means, but at least it isn't a shock.
Mine actually melted. I bought a new one. A dynex ultimate charger dx-ua. Its 11 volts / 1.5 amp. It charges great and no more problems
Sent from my Transformer TF101 using XDA Premium App
This would explain why sometimes I feel the tingling and other times I don't - probably based on the way I have it plugged in.
@D_Czap - Melting is a pretty scary and dangerous possibility...wonder if they're going to issue a recall.
Interesting find! Were you able to take a measurement with the charger plugged into the keyboard, and the tablet charging from the keyboard?
Popsiclestand said:
This would explain why sometimes I feel the tingling and other times I don't - probably based on the way I have it plugged in.
@D_Czap - Melting is a pretty scary and dangerous possibility...wonder if they're going to issue a recall.
Click to expand...
Click to collapse
Hah. I felt that tingling too. Now it makes sense.
Not pleased that my tablet has another issue though
D_Czap said:
Mine actually melted. I bought a new one. A dynex ultimate charger dx-ua. Its 11 volts / 1.5 amp. It charges great and no more problems
Sent from my Transformer TF101 using XDA Premium App
Click to expand...
Click to collapse
If it melted, it was a fire hazard. Be sure to let Asus know!
I noticed the tingling the other day!
Sent from my Transformer TF101 using XDA Premium App
thanks for OP, we can now avoid the tingling by plugging the ac adapter upside down, or in other words with the "S" in the word "ASUS" logo on the side of the longer slot.
klau1 said:
thanks for OP, we can now avoid the tingling by plugging the ac adapter upside down, or in other words with the "S" in the word "ASUS" logo on the side of the longer slot.
Click to expand...
Click to collapse
Reversed the adapter... tingling is gone... this is starting to sound like a jock-itch commercial! LOL Thanks for the tip.
Sent from my Transformer TF101 using XDA Premium App
Thanks to the OP for reporting this issue. I suspect, though, that the problem goes deeper than just a question of polarization of the AC wall connection.
I would expect complete isolation between the AC input and the DC output to the TF. The presence of a measurable AC voltage between those points implies to me that there is some leakage current between the primary and secondary leads of the transformer in the power supply. That just should not be happening.
I suggest that you do a resistance check between the AC connectors (not plugged into the wall, of course) and the chassis ground of the TF when the charger is plugged into the TF. Any resistance reading lower than open would indicate a path for current, and a potentially hazardous condition.
There is another thread on this forum reporting a problem that ASUS is aware of with one model (0B-LF) of the chargers, but I don't know what the problem is, and perhaps this is it.
It would be helpful for anyone experiencing even a mild shock, to check the model number, and post that fact and the charger model number on this thread.
I'm due to get my TF tomorrow, and that's the first thing I will be checking.
As a possibly related aside, I think that Asus is shipping the adapter disassembled for a reason. I think that they got UL approval on the adapter alone, and not the assembled unit. That's easier for manufactures to do these days, just one thing to get approved. That's why they can't ship with the AC portion attached. On the down side, it might mean that the adapter was never tested by UL with the AC prongs attached.
Here is a pic of my adapter with a melted prong, Kind of scary.
After some tests, I am finding that the adapter is marginal at best and should probably not be used to charge the TF mated with the KBD especially when both batteries are low. I have had good results charging separately and in stages stopping when the adapter gets hot. I would not let my combo sit on charge overnight( unattended). I am guessing that ASUS bought the charger from a supplier and that the capacities are overstated making the demand on it too much.
D_Czap said:
Here is a pic of my adapter with a melted prong, Kind of scary.
Click to expand...
Click to collapse
That is indeed scary. Can you provide the model number of the charger?
vicw said:
That is indeed scary. Can you provide the model number of the charger?
Click to expand...
Click to collapse
The model number is AD827M. That was kind of hard to read.
Rumbleweed said:
After some tests, I am finding that the adapter is marginal at best and should probably not be used to charge the TF mated with the KBD especially when both batteries are low. I have had good results charging separately and in stages stopping when the adapter gets hot. I would not let my combo sit on charge overnight( unattended). I am guessing that ASUS bought the charger from a supplier and that the capacities are overstated making the demand on it too much.
Click to expand...
Click to collapse
This could be true. It might be like the Apple iPhone charger recall. Maybe we need to look for chargers with the green dot.
D_Czap said:
The model number is AD827M. That was kind of hard to read.
Click to expand...
Click to collapse
Can you read the 'Type' code (it's on the line underneath the model number) and tell us that too please?
I have read so many threads with problem x solved by using a quality USB cable, and yet I still find others arguing that there is no difference in cheap cables. In-fact i have just had a discussion about this with a friend yesterday so i thought i would just let everyone know - USE A GOOD CABLE!
To test this I used an ebay cable, oem samsung, oem moto, and a case logic cable. I then simply transferred a small 6 mb file and a larger 200mb file to the phone.
Ebay - phone wouldn't even connect to pc.
Sam - both worked
Moto - both worked
Case - 6 mb worked, 200 started and then completely froze forcing phone reboot.
So again, especially when flashing, use a good cable!
Good to know. Thanks
Just another heads up... My wife has a Motorola and I have the siii. Using my siii cable, both of our phones charge at least three times faster. Using the Motorola cable, both of our phones charge much slower.
Another heads up... Get the best of both worlds, high quality and low price on a usb cable. Go to monoprice.com!
Sent from my SCH-I535 using xda app-developers app
Most Likely those talking about difference in Cables could be talking about how each manufacture alters their cable.
For example, Moto and Samsung have a Resister that links 2 of the 5 pins which is hidden in the plastic. Reason for this is, Car docks, it would tell phone to open car dock App etc, Same for media docks.
Charger usb cables are same because some phones can handle a higher amp of charging which charges faster while a standard usb cable needs to made to have a limit to not fry the device it is being used on.
Hope This helps, i know it did when I learned this,. Now it makes more reasons and ideas for Mods...LOL
This is news??
Duh.
Sent from my SCH-I535 using Tapatalk 2
Isn't it just safe to use the USB cable that came with the device?
1ManWolfePack said:
This is news??
Duh.
Sent from my SCH-I535 using Tapatalk 2
Click to expand...
Click to collapse
News???
sircody said:
News???
Click to expand...
Click to collapse
I mean, I thought this was a given...
Sent from my SCH-I535 using Tapatalk 2
1ManWolfePack said:
I mean, I thought this was a given...
Sent from my SCH-I535 using Tapatalk 2
Click to expand...
Click to collapse
LOL....Was trying to be nice and spread a little learned knowledge to person here talking about differences in usb ....and why
sircody said:
LOL....Was trying to be nice and spread a little learned knowledge to person here talking about differences in usb ....and why
Click to expand...
Click to collapse
Fair enough!
***bows head in silence
Sent from my SCH-I535 using Tapatalk 2
monoprice
TheHobbyist said:
Get the best of both worlds, high quality and low price on a usb cable. Go to monoprice.com!
Click to expand...
Click to collapse
I'll second that, best place to get almost any cable you can think of. I have yet to be disappointed.
sircody said:
Most Likely those talking about difference in Cables could be talking about how each manufacture alters their cable.
For example, Moto and Samsung have a Resister that links 2 of the 5 pins which is hidden in the plastic. Reason for this is, Car docks, it would tell phone to open car dock App etc, Same for media docks.
Charger usb cables are same because some phones can handle a higher amp of charging which charges faster while a standard usb cable needs to made to have a limit to not fry the device it is being used on.
Hope This helps, i know it did when I learned this,. Now it makes more reasons and ideas for Mods...LOL
Click to expand...
Click to collapse
If you're using a charger for a different device, it's likely that they have different amperage. A 2 amp charger will charge your phone a LOT faster than, say, the 0.5 amps off your computer's USB port. In this case, it's not the USB cable itself, but the amperage of the transformer in the charger. Some may argue that the slower charge is "better" and will help your battery last longer.
If you're using the same charger with different USB cables, then this is news.
I haven't even used the OEM cable that came with my GSIII. I picked up a 6 foot no name USB cable from newegg for $1.39 and it works fine.
Sent from my SCH-I535 using xda app-developers app
tech.kyle said:
If you're using a charger for a different device, it's likely that they have different amperage. A 2 amp charger will charge your phone a LOT faster than, say, the 0.5 amps off your computer's USB port. In this case, it's not the USB cable itself, but the amperage of the transformer in the charger. Some may argue that the slower charge is "better" and will help your battery last longer.
If you're using the same charger with different USB cables, then this is news.
Click to expand...
Click to collapse
Was going to point this exact thing out. It is also possible the cables could be rated for passing different rates but it is much more likely that something is putting off more power so it charges faster. I do tend to agree though that slower is better since you can pull the plug faster and not overcharge
Over time I end up having loose connection problems with virtually any microusb cable i buy, including from monoprice. At first the cable plugs into the phone fine and charges. Overtime somehow the microusb part that goes in the phone is looser in the phone than before, and i have to angle my phone in way to get it to start charging. The slightest movement causes the charging to stop. I have had this problem with almost every micro usb cable i ever owned ever since I got an htc thunderbolt and the problem continues now with my s3.
Sent from my unlocked VZW Galaxy S3
These work fine for me
http://item.mobileweb.ebay.com/viewitem?itemId=400319400418&index=0&nav=SEARCH&nid=76893193121
Sent from my Obsession
going to mono price. I'll report the results.
One thing to keep in mind also is that most, if not all, USB cables aren't shielded so the longer they are they degrade the transfer speeds etc. I don't think it would make a difference for charging, but to transfer data a shorter higher quality cable would be your best bet. I don't know if the degradation would be noticeable tho...
zmedhaug said:
going to mono price. I'll report the results.
Click to expand...
Click to collapse
You wont be disappointed. Quality products at great prices. They also stand behind their products if, in the rare event, you have a problem with one.
zedocus16 said:
I have read so many threads with problem x solved by using a quality USB cable, and yet I still find others arguing that there is no difference in cheap cables. In-fact i have just had a discussion about this with a friend yesterday so i thought i would just let everyone know - USE A GOOD CABLE!
To test this I used an ebay cable, oem samsung, oem moto, and a case logic cable. I then simply transferred a small 6 mb file and a larger 200mb file to the phone.
Ebay - phone wouldn't even connect to pc.
Sam - both worked
Moto - both worked
Case - 6 mb worked, 200 started and then completely froze forcing phone reboot.
So again, especially when flashing, use a good cable!
Click to expand...
Click to collapse
When you say the transfer started and then froze, I would have to ask what ROM you're running. If it's TW or TW-based, I'd be much more willing to blame the software than the cable. Using Samsung's MTP interface, I have had plenty of large file transfers crap out using both high and low quality cables.
Either way, this test is hardly complete. Obviously somethings wrong with the Ebay cable, but for the other tests, you need to run them more than once. To give any statistical significance to the data, the tests have to be run a bunch of times. Otherwise it is (as far as you know) just luck.
Also, as others have said, I think the primary differences between cheap and "quality" usb cables are
Amperage (which is mostly due to the charger, not the cable, but generally you want a cable that can handle it)
Quality of the connector (cheap cables generally have flimsy connectors)
Quality of construction/Durability (may work fine, but die after a month or two).
I don't think data transfer is something that is really impacted much by the quality of the cable (until you hit that point where the cheap cable just stops working). Getting back to my earlier point about the limited testing, I think if you ran the same test a whole bunch of times (like 100 times for each file on each cable), you'd find that as long as the cable actually works (which seems to exclude the ebay one), they'd probably perform about the same on average.
Just my two cents.
Has anyone had a positive experience using an aftermarket sync cable or charger? I have bought a few (for other devices) in the past, but several have had issues (flaky touch screen during charging, slow/no charge).
I'm looking for outlet type, USB sync and car charger (long cord!).
Any good reports?
Search Amazon. I have had good experiences buying the cables. My cat seems like them and chews on the cables if I forget to put them away. I don't remember the brand but there is one where the cable casing is a rubber material. I think it's like 2 for 15bucks and they are 6' I think. I've had the best luck with those.
When I tried an aftermarket charger it was for the Prime. It didn't work at all but was also the first aftermarket plug being sold. Over heated and would stop charging a few minutes after plugging it in but continued to heat up. People are giving a few of them 4 star reviews. They may have gotten better now. Other than that it's buy the oem charger. I have not seen an aftermarket usb plug that can deliver the 15v required in these units. If anyone else knows of one I'd probably order one for work.
I bought some off Amazon from a brand/company called "Power +"
They work great, both the car charger and the wall charger. A bit better quality than the factory Asus charger as well.
I was looking into the same myself. I've read many horror stories of aftermarket usb charger/sync cables from Amazon, some seemed to work "great" while down the page I read other users having theirs not fit right/fall apart at the connector.
I could definitely use a longer cable as the stock cable is just too short to use from the socket to the desk, let a lone if I'm under less than ideal places like a lounge/library.
ssnova said:
I could definitely use a longer cable as the stock cable is just too short to use from the socket to the desk, let a lone if I'm under less than ideal places like a lounge/library.
Click to expand...
Click to collapse
You can extend the cable with a USB 3.0 cable. (2.0 doesn't work).
I have this charger - albeit bought through eBay. I did not experience any problems with the charger itself, but the cable frayed where it meets the strain relief on the power brick after a couple of months. After taping up the connection, I am temporally using it to charge up the dock before I can get an OEM charger, but won't let it touch my Infinity itself.
i brought one real crap had to mess with it for it to work
Pwr+ Cables are awesome, They sent me one as a gift for posting a review of the ones I purchased too. kinda nice. I have the OEM cable now and three Pwr+, now I just need more power cubes. (Office Desk, home desk, bedside)
im_electronic said:
Pwr+ Cables are awesome, They sent me one as a gift for posting a review of the ones I purchased too. kinda nice. I have the OEM cable now and three Pwr+, now I just need more power cubes. (Office Desk, home desk, bedside)
Click to expand...
Click to collapse
Where did you post the review?
Sent from my ASUS Transformer Pad TF700T using xda app-developers app
Amazon. http://www.amazon.com/review/R3JD8T...e=UTF8&ASIN=B0093OWEOE&linkCode=&nodeID=&tag=
KHOMO 6.5' Pack of two
Nice length - quirky connection but works with charger and USB connection. If they made the connection a little tighter at the tablet it would be perfect.
http://www.amazon.com/gp/product/B007K94I2U/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1
Anyone found a aftermarket 15V charger that will work for tablet and keyboard dock?
Mikerla said:
Nice length - quirky connection but works with charger and USB connection. If they made the connection a little tighter at the tablet it would be perfect.
Click to expand...
Click to collapse
I also bought a two pack of these. So far, I have not had any problems out of them. I also got the power+ wall charger and it has worked great.
Chargers don't work
I have bought 2 chargers for my TF700 and neither works. When the first one didn't work I thought it was because is was 2000mA so I bought a 2500mA. Is this not a regular USB charger? What is the voltage?
Thanks
Ólafur
:crying:
The amazon links can't be able for a shipment to France.
Could someone help me to find the Cord Charging Data Sync Cable 3.0 USB to 40 Pin for Asus Eee Pad Transformer TF700T ?
Really appreciate the links here - have a need to buy another cable for my TF700
There is a protocol where the tablet instructs the charger to change to a 15v output. Nonstandard USB.
ken
Sent from my XT1080 using XDA Free mobile app
I'm currently using this one It works perfectly fine with the stock USB wall adapter and I'm really happy! It's just a damn shame we can't charge the tablet view our PCs...
I'm looking for a micro usb charging cable that's over the standard 5' long, and am not having much luck. I've purchased two, but the quality on both was inferior. As we know, our S4's have fast charging enabled, and I can DEFINITELY tell the difference between the cables I've purchased vs. the shorter cable.
Has anyone found a longer cable that charges just (almost) as fast? If you could point me to it I'd be forever grateful!
http://forum.xda-developers.com/showthread.php?t=2448200
netrisca said:
http://forum.xda-developers.com/showthread.php?t=2448200
Click to expand...
Click to collapse
Thanks!
You have to remember that resistance is a function of length. So you'll get decent charging as long as the data pins are shorted, but resistivity of the wire = rho*L/A. Just thought I would throw that out there.
You can use the pwr+ adapter with any length usb to accomplish what you are wanting though.
Sent from my GT-N8013 using Tapatalk 4
1454 said:
You have to remember that resistance is a function of length. So you'll get decent charging as long as the data pins are shorted, but resistivity of the wire = rho*L/A. Just thought I would throw that out there.
You can use the pwr+ adapter with any length usb to accomplish what you are wanting though.
Sent from my GT-N8013 using Tapatalk 4
Click to expand...
Click to collapse
Makin' me do math this early......shame on you! :laugh:
i am using a usb 3.0 extension cable, which is 15ft long. i notice charging is a bit slow when using the extension cable. i really want a long cable, the outlet layout in my room is weird. any cable that is 15 or even 10 feet long that doesn't interfere with charging time? or is this just a case of power attenuation?
I doubt you gonna find a cable like that... Also the power loss is normal for such a long cable. I still remember from my electronics class when the teacher told us, that the longer the cable is, the more power it looses
I think you can make 50m without big loss of power.
The Android Attorney said:
i am using a usb 3.0 extension cable, which is 15ft long. i notice charging is a bit slow when using the extension cable. i really want a long cable, the outlet layout in my room is weird. any cable that is 15 or even 10 feet long that doesn't interfere with charging time? or is this just a case of power attenuation?
Click to expand...
Click to collapse
Have you tried measuring the charging current? You could try Ampere (http://forum.xda-developers.com/android/apps-games/app-ampere-charging-meter-t3012890) to see if there is a real difference when comparing short/long cables. Then also, you might want to check if the charger - assuming you are using a charger and not simply charging from your pc - gives you the maximum output (galaxy s5 charges with 1.8A max, so a 2A-Charger would fit your needs best).
Kind regards,
Kenny
15ft cable isn't going to drop any noticeable amount
http://www.calculator.net/voltage-drop-calculator.html
*Detection* said:
15ft cable isn't going to drop any noticeable amount
http://www.calculator.net/voltage-drop-calculator.html
Click to expand...
Click to collapse
Taking run-of-the-mill usb cables (inc usb 3) as using an average of 24 gauge wires for the power lines, that calculator shows that 5v DC has a 15% drop over 15 feet, giving an output of 4.23v at 1 amp, and a drop of almost 31% at 2 amps giving an out put of just 3.46v.
The OP would need to get a good quality cable using 20 gauge wires for the power lines to reduce the voltage drop at 1 amp by just 6% or at 2 amp by 12%.
http://www.amazon.co.uk/JuicEBitz®-Charger-Android-Tablets-BlackBerry-Black/dp/B010XWJBXQ
A cheap and nasty cable over 15 feet will absolutely hammer the output.
A better option would be to use a 15ft mains extension lead to move the outlet source closer and keep the usb lead on the charger to 5 or 6ft.
My bad, I missed the 'USB' part, was thinking OP was talking about purely a DC power adapter cable
I run CCTV cameras @ 20ft with 12v DC
They make these things called extension cords! we use AC for the simple reason that it travels over long distances well. Google Bell vs Westinghouse !
Stachura5 said:
I doubt you gonna find a cable like that... Also the power loss is normal for such a long cable. I still remember from my electronics class when the teacher told us, that the longer the cable is, the more power it looses
Click to expand...
Click to collapse
sullytrny said:
They make these things called extension cords! we use AC for the simple reason that it travels over long distances well. Google Bell vs Westinghouse !
Click to expand...
Click to collapse
Two posts back already suggested using a mains extension instead of a 15ft usb lead
hundred_miles_high said:
Two posts back already suggested using a mains extension instead of a 15ft usb lead
Click to expand...
Click to collapse
anyone who needs to ask will not know what "mains" means, see it all the time in 3d printing with the HBP's
You need a custom Kernel and a Rom Customizer app like Boeffla Config where you can set the Charging Current to a fixed value not depending on cable length
The best USB cables I've ever used come from a company called MediaBridge. You can get them on amazon for pretty cheap, and they are extremely high quality cables. I use a 10ft, and my phone charges just as fast as it does on a 4-ft cable.
Anker cables are great... faster then the oem cables.. substantially!
Sent from my SM-G900T using XDA Free mobile app
Sean89us said:
The best USB cables I've ever used come from a company called MediaBridge......my phone charges just as fast as it does on a 4-ft cable.
Click to expand...
Click to collapse
This cable it is specified as Faster Charging (Up To 2.4A).
But it product design this does not give me much of confidence, yesterday ordered one REMAX 2.4A(Max) this seems to have what needed for a six feet 2.4A cable.
The downside with REMAX this is flexibility, lots of copper inside makes it hard to twist it, or hide it when this crossing your office furniture.
Regarding REMAX cables, I need some help here from someone with Chinese education.
I need to find their exact cable specifications.
In the picture below they do mention some details, but I can not understand if they use metric or AWG.
Use a stronger Block
Large power block this is not needed.
People with technical background in electronics, them will possibly find as interesting my new article.
http://www.ittsb.eu/forum/index.php?topic=1153.0
I use these with 2A charger and get average of 1200mA charge. The guage of the wire is smaller (ie thicker) and it works!
So in summary 10 foot cable charging at over 1A.
http://www.amazon.com/iXCC-Element-Series-2-Piece-MicroUSB/dp/B00VU7PGPQ?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_search_detailpage
pigphish said:
I use these with 2A charger and get average of 1200mA charge. The guage of the wire is smaller (ie thicker) and it works!
So in summary 10 foot cable charging at over 1A.
http://www.amazon.com/iXCC-Element-Series-2-Piece-MicroUSB/dp/B00VU7PGPQ?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_search_detailpage
Click to expand...
Click to collapse
19AWG for this cable, this is a marketing myth.
Kiriakos-GR said:
19AWG for this cable, this is a marketing myth.
Click to expand...
Click to collapse
You can't argue with the fact that it works. I have 4 of these and they all perform well. If you want to pay for it I would be happy to crack one open and test the gauge on it.