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Hi all,
I've searched the forums thoroughly and I couldn't find the solution.
I have a brand new transformer tf700 and keyboard dock tf201. They were purchased in the USA and brought over to me in Hanoi, Vietnam.
The charger will charge the tablet, but not the dock.
When the charger is plugged into the dock, there is no light. Also nothing happens when connecting the tablet and dock. No light on either, and the tablet does not enter a docked mode. So it seems like the battery on the dock is completely drained or the dock is simply faulty.
I've tried leaving it overnight for the initial charge (first thing I did), as well as different outlets and charging by USB.
Since the charger works on the tablet it seems obvious that the problem is with the dock, but is there any further troubleshooting I can do to confirm this 100%? Since I'm in Vietnam, sending the dock back for warranty etc.. is going to be very problematic and in fact its illegal for used electronic items to be shipped back into Vietnam. So I really want to know 100% for sure what the issue is. Vietnam is 220V / 50HZ and it seems the charger is rated for that.
I'm open to more advanced options such as using a multimeter.
Thanks.
bump
It could be that the charger was meant for a newer version of the dock. Your using a TF700T charger with a TF201T dock.
It could just be a compatibility issue. If so just buy a TF700T dock or buy a TF201T charger. I hope this helps.
ostar2 said:
It could be that the charger was meant for a newer version of the dock. Your using a TF700T charger with a TF201T dock.
It could just be a compatibility issue. If so just buy a TF700T dock or buy a TF201T charger. I hope this helps.
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Very unlikely. I regularly charge my TF700 with the TF101 charger, and I am almost sure the TF201 uses the same charger.
_that said:
Very unlikely. I regularly charge my TF700 with the TF101 charger, and I am almost sure the TF201 uses the same charger.
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Perhaps, the docks power supply died. Which would mean either buy a new dock or send it in for warranty.
ostar2 said:
Perhaps, the docks power supply died. Which would mean either buy a new dock or send it in for warranty.
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Well I need to test this 100% for certain, because I can't send it in for warranty due to Vietnam's import laws, and the dock is not available for sale here at the moment. So neither of those options are viable
Like I said it has never worked but so far the only advice I have gotten essentially is "plug it in" as well as check the charger. The charger works fine with the tablet so I'm pretty sure that its not that, however I am curious about the mechanism by which it jumps from 5v to 15v and how it may behave in houses with or without voltage stabilizers.
Unless I've overlooked a very simple step I'm really wanting to move forward into a more technical analysis (ie: checking voltages / opening the dock).
Further info: the shop tested the dock before sending it (it was open but unused) and it worked fine.
So this strengthens the case for a charger/voltage/amperage related issue. Of course it could have been damaged in transit but it was DHL priority and appropriately marked so not too likely
maliusmaximus said:
Further info: the shop tested the dock before sending it (it was open but unused) and it worked fine.
So this strengthens the case for a charger/voltage/amperage related issue. Of course it could have been damaged in transit but it was DHL priority and appropriately marked so not too likely
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It could just be you need a universal plugin to convert the amperage.
ostar2 said:
It could just be you need a universal plugin to convert the amperage.
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Well a universal plug as I know it is just an adapter. It doesn't have any step-up/step-down capabilities.
But if you mean a universal power converter then possibly, although usually they just provide 12v, not 15.
The supplied adapter should be fine though, because its rated at 110-240V (Vietnam is 220V) and 50/60Hz (Vietnam is 50Hz).
My only thought with the adapter was whether it was having problems stepping up to 15v as it charges the tablet at 5v just fine.
Question: Does trickle feeding the tf201 on USB work? Also does the light turn on for a trickle feed?
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does this do anything.....
fully charge the tablet on its own, connect it to the dock, connect the charger (plugged in), restart the unit?
DNO1978 said:
does this do anything.....
fully charge the tablet on its own, connect it to the dock, connect the charger (plugged in), restart the unit?
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No I tried that before creating the thread. Thanks anyway.
Don't know if this has been asked yet, but does the dock actually work (not just the battery)? Can you plug it into a nearby computer and access the mounted tablet? Also, there's a widget on the tablet that can show if the dock/tablet is charging or not. Also, you mentioned trying power from different outlets. Did you try outlets in a different building (like a hotel or university)? I've seen from visiting Brazil that "standardized electricity" doesn't mean that everyone has adopted it.
From what you've mentioned, you really have 3 viable options of failure: Dock battery is bad, dock is completely bad, or incorrect power. If its the battery, then you get to decide if you want to rip it apart or not. If its completely bad, then you would probably need to send it back. Finally, if it just doesn't work where you are, it could be that the building isn't up to standards or even that there might be electrical issues in the building your at.
_that said:
I regularly charge my TF700 with the TF101 charger, and I am almost sure the TF201 uses the same charger.
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I use a TF700 charger for charging my TF201. I agree that there's probably little difference in the charger.
maliusmaximus said:
Does trickle feeding the tf201 on USB work? Also does the light turn on for a trickle feed?
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It seems like there is a trickle and the light does not turn on. I only tried it for about a minute but the tablet did show that charging was happening. Maybe later I'll try a longer test.
Let us know if you've discovered or decided anything new.
alienedd said:
Don't know if this has been asked yet, but does the dock actually work (not just the battery)?
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Thanks but I tried that already before posting. Plugging the tablet into the dock does nothing, and plugging the dock into USB at the same time has no result.
alienedd said:
Did you try outlets in a different building (like a hotel or university)? I've seen from visiting Brazil that "standardized electricity" doesn't mean that everyone has adopted it.
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Not yet, but I will try that soon. I have a working voltage stabilizer in my house, as well as about 8 computers and 5 tvs etc.. Everything works very well and when I fixed some people's hardware recently it worked in my house but not theirs (due to my power supply being good) so I'm pretty sure that's not the issue. I will take it somewhere else though just to rule that option out.
alienedd said:
From what you've mentioned, you really have 3 viable options of failure: Dock battery is bad, dock is completely bad, or incorrect power. If its the battery, then you get to decide if you want to rip it apart or not. If its completely bad, then you would probably need to send it back. Finally, if it just doesn't work where you are, it could be that the building isn't up to standards or even that there might be electrical issues in the building your at.
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Right, that's the conclusion I came to as well before posting. So I really wanted to know if I had overlooked something simple (doesn't seem as though I have) or begin more advanced diagnostics such as using a multimeter or hear some stories from someone who has taken their dock apart before I tear in.
Thanks again!
Well, I believe that the tablet should find the dock even if the dock has no battery power. The battery of the dock is merely a backup battery for the tablet and not used by the dock itself for functionality. For this reason, I think you got just a bad dock. If you want to try to replace the battery (since you are closer to China and Japan), you are looking for a C21-TF201D battery. You will need a small torx screwdriver (like a T-3 or T2 - my smallest is a T-4 which is just barely too big) to remove the screws in the back and a Phillips 0 to remove the screws under the pads. Top piece can then be lifted gently and there are 2 ribbons underneath to fully detach the keyboard. From there you should have just a few more things to do to get to the battery. There's a teardown video here but the speech is almost inaudible and the music is distracting.
What I was thinking is that the dock was tested before shipment then it arrived nonfunctional. It leads me to believe that something was damaged during transport (derrr, yeah I know that's obvious just bare with me). If that something damaged was the battery, then there could be some leakage that has led to possibly corrosive damage to other electronics in the device. And that wouldn't be fun to try to fix on your own. If you want to continue trying to troubleshoot it, you might want to do it without attaching the dock to the tablet until you find out what is wrong because you don't want to possibly fry your tablet connector due to the dock acting unreliably.
You should probably start talking with your shipping carrier about the fact that the device was damaged and that you should be reimbursed somehow. This might allow you to get a new one through them or sufficient money for a replacement.
alienedd said:
Well, I believe that the tablet should find the dock even if the dock has no battery power. The battery of the dock is merely a backup battery for the tablet and not used by the dock itself for functionality. For this reason, I think you got just a bad dock. If you want to try to replace the battery (since you are closer to China and Japan), you are looking for a C21-TF201D battery. You will need a small torx screwdriver (like a T-3 or T2 - my smallest is a T-4 which is just barely too big) to remove the screws in the back and a Phillips 0 to remove the screws under the pads. Top piece can then be lifted gently and there are 2 ribbons underneath to fully detach the keyboard. From there you should have just a few more things to do to get to the battery. There's a teardown video here but the speech is almost inaudible and the music is distracting.
What I was thinking is that the dock was tested before shipment then it arrived nonfunctional. It leads me to believe that something was damaged during transport (derrr, yeah I know that's obvious just bare with me). If that something damaged was the battery, then there could be some leakage that has led to possibly corrosive damage to other electronics in the device. And that wouldn't be fun to try to fix on your own. If you want to continue trying to troubleshoot it, you might want to do it without attaching the dock to the tablet until you find out what is wrong because you don't want to possibly fry your tablet connector due to the dock acting unreliably.
You should probably start talking with your shipping carrier about the fact that the device was damaged and that you should be reimbursed somehow. This might allow you to get a new one through them or sufficient money for a replacement.
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What can I say, you're a legend. That's just the kind of info I was looking for. I'll get stuck into it soon and let you know how it goes.
I also wondered about whether the tablet should connect to the PC via the dock but my thinking is that you may need a minimum charge to get through the extra circuity in the dock (all dem capacimataters and circamatronics). But yeah I see your point.
About the dock working before they sent it, I'd take that with a grain of salt.
Full disclosure: When the company sent the package, they forgot to include the dock altogether and my friend left America the next day. When I was talking to (screaming at) them, they said they were totally out of stock except for one which was opened but unused. They agreed to courier it (DHL express international... ouch) over to Vietnam (as it had most of its packaging so could be treated as new. ). Why that dock was already opened in their shop I wonder. Methinks it was probably already broken and they are trying to cut their losses (they already had to cover international shipping and 100% import tax so they lost out big time due to forgetting to send the dock. They knew I couldn't send it back from Vn either).
Once again thanks!
I've swapped in a mainboard from another dock that had a bad battery.
Now the dock dock functions fine, and the tablet connects and can be charged through the dock.
However the battery light for the dock just stays as orange no matter how long I charge it for. And it always shows 0% battery on the dock so it seems like the battery doesn't charge at all.
What areas should I check? Also if I use a multimeter to check the battery, is there any way to tell if the battery can hold charge (and the issue is somewhere in the connectors) or if the battery cannot hold charge at all?
I tried a cold boot, no luck. Perhaps an alternative is the mainboard needs some kind of hard reset to recognize the new battery? Or of course the battery could just be bad, like the mainboard.
maliusmaximus said:
I've swapped in a mainboard from another dock that had a bad battery.
Now the dock dock functions fine, and the tablet connects and can be charged through the dock.
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That's great to hear! Now at the very least you have a functional dock.
maliusmaximus said:
However the battery light for the dock just stays as orange no matter how long I charge it for. And it always shows 0% battery on the dock so it seems like the battery doesn't charge at all.
What areas should I check? Also if I use a multimeter to check the battery, is there any way to tell if the battery can hold charge (and the issue is somewhere in the connectors) or if the battery cannot hold charge at all?
I tried a cold boot, no luck. Perhaps an alternative is the mainboard needs some kind of hard reset to recognize the new battery? Or of course the battery could just be bad, like the mainboard.
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Click to collapse
Unfortunately, it has been years since I've used a multimeter for these situations so I wouldn't be able to help you out directly in that area. Googling for how to test batteries on other devices - like the TF101 dock or even regular batteries - could provide additional valuable information to help you in your experiments.
There's the possibility that it's merely a calibration issue where the dock has no knowledge of the battery's charge, but the fact that there's a constant 0% and the light stays orange all the time (never turning to green) then it leads me to believe it's a bad battery. Have you tried checking if the tablet continues to charge from the dock with no charger attached? If the dock charges the tablet in this fashion, then it's a battery data issue. Likewise, have you tried to use the dock without the battery, detach dock, then reinsert battery to see if that spurs the dock to reset its battery data? You might also look into an app or widget that will show you the battery output charge and all (like this). That's all I can really think of at the moment. Hopefully, from whatever tests you perform we can discover whether it's really a bad battery or something else.
Thanks for suggestions Alienedd. I ended up going back to Australia for Christmas so I quietly slipped the defective parts back in and made a warranty return.
The tablet needs a new charging/interface port and was wondering if anyone knows where I can get one?
I have searched Ebay and the net for a used/new one. The port looks fine but when plugging the cable in it won't charge. Sometimes I can get it to if I push and hold it just right however this is tricky to do and does not work often. So right now it is a dead brick. The pins must not be making full contact for some reason.
Ive bought parts from these guys before, I don't see a charging port but might be worth giving them an email and asking
http://www.asusparts.eu/partfinder/Asus/Pad/Eee pad/TF101
*Detection* said:
Ive bought parts from these guys before, I don't see a charging port but might be worth giving them an email and asking
http://www.asusparts.eu/partfinder/Asus/Pad/Eee pad/TF101
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Thanks but I would rather not have to order parts from Sweden. If I have to I'll just keep watching Ebay. Every so often one pops up but doesn't last very long.
Good luck
The parts I ordered took about 4-6 weeks to arrive iirc
Just installed a new (used off Ebay) charging port with fingers crossed that it will allow the tablet to charge. I also have a new high quality charging cord (PWR+) and two ASUS wall chargers that I know work. Plugged the tablet in and was relieved to see the tablet come right on and show it charging. Let it charge to about 20% and then decided to unplug it so I could put the ring back on the tablet so it is all back together. Get the ring on and plug the tablet back in and nothing. I'm about to throw this thing in the trash right now. So fed up with these charging issues. What changed? All I did was unplug it, put the ring on, and plug back in.
So for kicks I decide to try the other wall charger and what do you know....it came on immediately and started charging and is still charging. I'm afraid to touch the thing now. Seems once it is charging and undisturbed it will charge to 100% no problem. However, when going to recharge it won't charge. Could there be something in the charging mechanism causing the thermal to trip in the wall chargers? Is there possibly a small short somewhere in the charging mechanism? Anyone have an opinion on why this is happening? Only other thing I can think of is doing a full wipe/reset and maybe flashing another rom (is currently on newest Android Revolution HD) once it is charged up.
Could the ring (I assume you mean Bezel ? ) or the screws near the port be shorting the charging port to earth/ground/chassis ?
*Detection* said:
Could the ring (I assume you mean Bezel ? ) or the screws near the port be shorting the charging port to earth/ground/chassis ?
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Yep.. Sry.. The bezel. Not sure how but anything is possible. Would indicate to me a faulty charging port or charger cord and is happening on multiple. Tablet is still allowing me to charge it at this time after switching chargers and with the bezel on so will have to see how it goes.
Sent from my tricked out S4.
Fingers crossed it was a coincidence with the first charger, if not, I'd try taking the bezel off again and see if you can spot the short / see if it works again with the bezel off, or even just with the screws out
So I bought a cheap cable from eBay that converts microusb to the proprietary Galaxy connector on this device. Tried to charge the device but it entered a bootloop. Unplugged the cable and tried charging with the stock cable and left it overnight. Woke up and the device was completely dead.
Wouldn't boot at all.
Tore it open, unplugged the battery and plugged it back in. It booted! BUT the battery was critical and it shut off immediately. Tried charging again, no dice.
So I unplugged the battery and applied 4v to get some charge into it. Got the battery up to about 3.6V, booted again and it showed 3%. So in the time I had with the device turned on I tried both cables again but neither would charge the device. I used a multimeter to test the stock cable and it was all good, I even did a beep test between the 4 USB pins in the stock cable and the places they're wired up to inside the note and everything was fine so it's most likely not the cable.
Anyway the 3% is long gone now and I can't boot or charge. The device and battery are fine and definitely working, it just won't charge through USB no matter what. I've tried different power points, different adapters including stock and normal usb ports.
I've also cleaned both the plug and the jack with a toothbrush.
Could it be that the internal charging circuitry got fried when I tried the dodgy cable? If so, is there any way to fix/bypass this?
I'm at a complete loss so any help would be greatly appreciated.
Regards,
Nas.
I would not recommend to charge battery directly outside the device or even remove the battery at all.
First you gotta make sure your cables are capable of charge other galaxy devices if a friend has Tab 7 or Tab 10.1 or other note 10.1 or another try your cables to see if they really work.
Because it may just be your cable, remember batteries have their own circuits boards of sort and batteries are sometimes picky on how they are charge especially OEM batteries that are not suppose to ever be out of the device unless are change for a new one in a repair.
So first of all cable check it a must, again is not as simple as check if all the pins works as this is not a simple USB (Universal Serial Bus) port is a proprietary port and cable, check the port in the tablet too.
As well it may be just a defective battery or worst case even a board problem.
Unfortunately I have no other device to test it with. I might just buy another cable and see how I go.
I know about the circuits on the battery, but I always thought they were just there as a safety measure due to the potentially volatile nature of Li-Ion when it drops below a certain voltage. I'll probably take your advice and stay away from charging it externally, I only did it once to see if the tab died or it was just a dead battery. The voltage never dropped low enough to trigger the circuit to 'kill' it, evidenced by the fact that I could get it back up to 3% just applying a constant voltage.
I'm guessing you've hit it on the head with the last sentence, might be a board problem which would be quite sad. Silly reason for a great device to die.
Thanks a lot for the reply, I'll update this thread once I try an alternative cable for future reference.
Ok, So to update:
I've bought and tested 3 separate cables, all provide 4.99V inside the device, but none of this makes it to the battery so I'm fairly certain it's the charging IC that's dead.
I bought a new battery that was charged to 40% so I was able to flash the device to see if it was maybe the custom kernel messing something up. Flashed to stock via Odin, still not charging.
From what I've read, I need a cell balancing circuit (since the battery is 2-cell Li-Ion) and a charging IC. I've found a suitable IC for fairly cheap, but I'm not sure if the balancing circuit is necessary. The battery already has one of these inside, but I'm not sure if this is just for Voltage/Current protection or if it also balances.
MP24AG: http://eng.it-m.co.kr/cnt/prod/tep_5l/MP24AG.pdf
If anyone knows I'd be very grateful.
Hi all, i have a problem with my s6. I repaired my s6 usb port and changed it with a new one. But still my phone charges at 250mah instead of 2000 and my pc wont recognise it, any suggestions?
A kind of "script-type" solution, but have you tried different USB cable? I suggest you buy a proper one, like 28/24 gauge USB cable.
These are a bit more expensive, but charge very well. Much better quality and charge faster.
Already changed ton of cables and usb ports, still the same problem
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Try To boot in safety mode volume Down + Power key
merwan said:
Try To boot in safety mode volume Down + Power key
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Already done
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I think your charging ic on logic board needs replacing. Only micro solderer people can replace that. Might not be worth for you.
i ve lent it on a samsung repairer guy. they changed battery, connector and installed a new os. now they said they should give me it tonight or tomorrow.. let s see if it works
ManuelBiancolilla said:
Already changed ton of cables and usb ports, still the same problem
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The way I read that you're expecting to get rapid charge from pc ports. Need a rapid charger for rapid charging.
ManuelBiancolilla said:
Hi all, i have a problem with my s6. I repaired my s6 usb port and changed it with a new one. But still my phone charges at 250mah instead of 2000 and my pc wont recognise it, any suggestions?
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Same issue here. Think its related to a charging chip
Hi,
I've got the exactly same problem here. Repacinfg battery and the USB port of the phone did not solve the problem. Did your repairing work out? Any more ideas?
Br
Johannes
Hello all :
I have exactly the same problem that you all I have 250 to 300ma really charge, that it is any charger of 0.5 amps 3.1 amps either with a quick charger from Samsung or quick charge 2.0 or other, any cable too, and any rom, tested Global, Lineage and stock.
Oooo, and i tested with a custom charger, 9v 2amps, nothing change !!! 0.250amps and 5hours to 50% -> 100%....
Is really strange problem.
Any Idea ? is possible to limitation software ???
Poebat said:
Same issue here. Think its related to a charging chip
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Yes is possible, but here i dont know.. beacause, it would have quite different effects depending on the chargers and on the voltage. here we have, in my case, the same problem regardless of the charger amps or voltage.
this is more like a software crash of the chips in the worst case.
Other hand I noticed that I had lost all utilities USB my phone example when I plug it on my computer it is absolutely not recognized... Any Idea for that ???
Thanks
Up
Need help.
In software, how or where is manageme the charge ? In the kernel ?
Is strange, the charge is blocking at 250ma...
Hi guys,
I haven't been able to charge my phone properly for a while - after reset when I plug in the original charger, it charges fast, when I unplug it and plug it back in, it charges slowly. When I unplug it again, it still shows the charging icon forever but it won't charge when plugged in. Factory reset doesn't help. The phone also randomly shows the USB moisture message even though it never got wet. Changing cables and power sources doesn't help.
Build MHA-L29 8.0.0.375(C636)
Thanks for any ideas!
Blow out the USB charging port on the phone. Also, use a toothpick to GENTLY clean out the port of lint and dirt.
And use app that tracks your charging speed. Try ampere In playstore.
robogo1982 said:
Blow out the USB charging port on the phone. Also, use a toothpick to GENTLY clean out the port of lint and dirt.
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Thanks for the reply. I tried that already. Is it possibly a battery issue? I wouldn't mind replacing the battery, which is cheap rather than replacing the phone because of such nuisance.
weyrulez said:
And use app that tracks your charging speed. Try ampere In playstore.
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Thanks, good idea.
Ampere clocks in at -250 mA after reset. Goes to around 1800 when plugged in to a third party charger, which drops to around 300 mA when unplugged (phone indicates that it is charging). After reconnecting it goes up to 1000 mA. I don't have my Huawei charger at work but it's similar - at first plug in it charges fast, after reconnecting it switches to the slow mode.
You should use your original charger. And see if supercharge is working. If not. Give it a shot in a service center. Theyll fix your phone for free if you still have warranty.
weyrulez said:
You should use your original charger. And see if supercharge is working. If not. Give it a shot in a service center. Theyll fix your phone for free if you still have warranty.
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I'll try that tonight, thanks. Unfortunately no warranty but I'll see what I can do.
domi_niku said:
Thanks for the reply. I tried that already. Is it possibly a battery issue? I wouldn't mind replacing the battery, which is cheap rather than replacing the phone because of such nuisance.
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Click to collapse
Well, before replacing the battery, try this:
- turn phone off
- connect to original Huawei Supercharge charger and charge up until 90% or so
- disconnect from charger and turn on
Use the phone as you normally would until around 35-40% remains, then try connecting the charger. If the issue persists, I still believe it is a problem with the charging circuitry rather than the battery. Especially if we take the moisture in the USB port message the phone shows. Replacing the USB charging circuitry should not be a big problem AFAIK, it is connected to the motherboard with a snap-on connector, replacing it should be easy as disconnecting the connector, removing the circuit with the port and placing the new one in.
Yep, I guessed it: https://www.youtube.com/watch?v=4avHFWjsz4k
Are you having issues where the phone is displaying 30 or so percent battery remaining, but the phone shuts down?
robogo1982 said:
Well, before replacing the battery, try this:
- turn phone off
- connect to original Huawei Supercharge charger and charge up until 90% or so
- disconnect from charger and turn on
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Click to collapse
That's a great point. I didn't know the USB circuitry can be replaced by itself. I don't have any issues with the phone switching off. It uses the battery all the way down to 1% or so. I don't see any erratic percentages. I'll replace the part and update you on what happens. Thanks!
robogo1982 said:
I still believe it is a problem with the charging circuitry rather than the battery.
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Click to collapse
Yup, that was the problem. Easy fix. Thanks for the suggestion!
Make sure your microphones still work. I had to replace my USB charging board (which also contains the mics) recently and the first one I tried had a bad mic. I could make phone calls just fine, but google assistant couldn't hear me. I got a replacement and both mics were fine.
domi_niku said:
Yup, that was the problem. Easy fix. Thanks for the suggestion!
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I wish I could close this thread but a lot of weird stuff happened since I "fixed" the phone.
Since I bought the battery before I was told it could have been the USB board, I replaced the old battery too. The first charge was smooth and I drained the battery to 0 as recommended. I plugged it back in and it charged to 5% and stopped. I noticed a chemical burn smell that I later realized was coming from the USB circuitry. At this point there was no way to charge the phone but when tried to turn it on, I still saw the red charge icon. I opened it up and put the old defective USB board back in and I was able to charge it. Throughout the day I noticed weird battery drain that I saw recently before the replacement of the USB board. As usual, I tried to restart the phone to fix that but it won't turn on. The battery was at 85% when I shut it down. When I try to turn it on, it won't even show that red charge icon. Nothing. I can't put the old battery back to see if that's the problem, because I bent it during replacement.
Could it be a battery issue this time or is the phone just dead at this point?