Related
My jasjar shutdown after the battery was drained from normal use. So I tried to plug it into the USB port to charge. Well the amber light did not come on. So I tried to unplug and plug in again. Nothing. So I tried to charge from the lighter adapter, still nothing. I do not have a wall adapter.
So I purchased a new battery, and inserted into my jasjar and plugged up to the USB port. Well now I get a flashing red instead of amber.
Well at this point and reading on this forum I decided to hard reset and reload the OS thinking the current one was corrupt. Well the hard reset didnt work using my USB. So I tried it while plugged up in my car and I got the menu and selected 0 to reset. But it showed clearing and then shut off. I called PPC Tech and they told me that it was all corrupt.
So I cant connect via USB so how do I get an OS on my unit. Is there another way to do this.
If anyone could help I would appreciate it.
Regards
Julian
You should see if you can enter in boot loader mode (search for all the procedures in the wiki).
If it does not enter into boot loader, then you will have to "unblock" it manually, this procedure involves some communication with the PDA directly with MTTY, again, search for this procedure in the forum/wiki, also search for the mamaich method if the things get tough, do not panic, it's usually feasible to recover your PDA.
Be patient and read, then if you have doubts, ask a more specific question, then the people who knows will usually answer you.
cheers
Thanks kecido for the reply,
Yes I can enter bootloader mode but only using car adapter. All my batteries are uncharged and I do not have a way to charge.
I do not have a way to get a USB connection to my device. For some reason nothing works with USB connection. I can only get the 2 boot screen methods by using car adapter.
I have tried 2 different USB cables, maybe I should try another.
Again thanks
you should just buy a wall charger from here http://www.buybits.com/product/sku_bb-world-charger-htc-universal.aspx
or even buy a cradle charger that can charger an extra battery as i doubt the universal will charge the battery without windows being booted (very stupid idea that). If you cant fix it can i buy the lcd cable from you As i have a universal that works but my backlight is broken
Well Im not ready to give up just yet. Somehow I have to get a battery charged, and proceed with the process.
Regards
Im still needing help
is there anyone that could assist me please. Im not sure what to do now.
So your device is not dead, well, then it should be easy, you just have to recharge one of your batteries out of the PDA, many sellers in Ebay (most of them from Asia) sell the batteries with an external charger, this could be a way of charging your battery without the PDA, you can also charge the battery with any external charger for Lithium batteries (i.e. a cellular external battery charger), you could even charge the battery with an old cell phone (it has to have a Lithium battery), all that you need is to take the positive and negative poles from the phone to the battery, it could take more time than with your PDA, but it will work.
You could also attach your PDA to an external power supply, you should give him 3.7V and at least 1A through the battery's contacts (not the USB connector that is disabled when you upgrade the rom), the power supply MUST have a voltage regulator in order to keep the voltage constant, if you're not sure about this, or if you don't have the necessary equipment, try the other two solutions to get your battery charger and being able to reflash your device.
I'm out of my work (another continent) and will not return until mid april, i do not remember the circuit well, but there I have a very simple one to recharge lithium batteries, but this requires electronic assembly, if you have the skills, you might search the internet for a Lithium battery charger.
bye
hi there.
shortly-i have this phone with no orig. usb cable and with no wall charger. it was friend of mine phone actualy. given to me with dead battery (i am not sure but i have trouwn it away long time ago)
first I did was to wait until friends of mine from china had sent to me 2 batteries compitable with the phone. what i discovered is that a normal ordinar usb cable cant charge the phone's battery it only can connect to the pc.
second what i did is this: i found my old charger from a very old panasonic cell phone and had a try to make the charging process with the simply contacting corresponding pinouts of the battery to the +&- of this same charger (somehow i dissasembled the plug of that charger and it became more "comfortable" to get in touch to the pinouts of the specific cingular's battery)
that unordinar way i did discovered that i can charge these batteries even not sure how much appropriate that other brand wall charger is. It seems its pretty much the same as a power characteristics.
Meanwhile (as i dont use this phone) i had some free time to search the net and to have better idea about that strange unordinar power charging matter with that model of a phone. The situation is that i cant find a place nearby me to buy a cheap usb and wall charger and become using this nice device finaly.
And also i dont want to buy these cable things before clearly understand why this happens ..
I did try also to charge this phone with a HTC brand wall charger but no sucsess again cause it seems this wall charger is for other htc phone (even same mini usb plug and same characteristics)
What i need is to have answers by someone very informed about that matter and let me know what exactly is the specific power charging matter (need explanations i mean) with this phone. If sharing some good ideas about how to remake others usb cable or wall charger for geting it work along for me in such a case , i will appreciate this very much
thanks
charge
hi ! please forgive me for my bad english! in this case you can charge your phone in 1 way! you need to procure a motorola or any charger with same socket but attention the charger must have 6 volts and no less than 500 mAh(milli amps)! you cut the wires and one wire put on the + of the battery you will see the signs on the battery an one wire at the - no matter which one. and you need stay with the wires 3 - 4 minutes on the battery ! then you put the battery on the phone it will start and then you cand fully charge it with the usb cable ! good luckk ! i hope my inf will help you!
no
no it doesnt work that way.
what i need is the simple answer : what is so special into the pinouts of htc cingular 8125 wall charger?
thats what i need only. Then I might figure out how to proceed
Thanks anyway
I don't know if anyone else has had trouble doing what I have done, but I've got the Cingular 8125 (HTC Wizard 100), which is also known as the HTC 8125.
1. I bought a car charger at a convenience store for $6 that had the mini-USB plug. It worked like a charm. Never any problem there.
2. I also bought a standard USB to mini-USB cable from the local computer store, because I had lost mine, and it also worked fine for both synchronization and for charging.
3. I bought a second wall charger, buying a standard mini-USB wall charger sold pretty much everywhere cellular phone chargers are sold. It's a common charging port, and this generic worked for me as well.
I'd be interested to hear if anyone has had problems with these types of devices not properly charging the unit.
Even my USB cable for my portable USB hard drive will power my unit.
EDIT: About your problem with it not charging. I had that problem about a year ago, when my battery got extremely old. It wouldn't charge even with the original charger. I just needed a new battery. The batteries get old and stop taking a charge after a certain amount of use. How long this takes depends on how heavily the batteries are used. They, like car batteries, do not last forever.
I had this problem when I had my wiz too. The battery died and drained, and my phone refused to charge it. I took it to an AT&T service center, and they had no clue what the problem was, and they wanted to issue me a replacement (it was a G4, I had a G3, I wasn't about to fiddle with that at the time.) So I asked to borrow a demo device they had there to fix it. I charged my battery on their demo device no problem, got it up to 3%, and finished charging it through my USB cable in the car socket.
It appears to be a sort of one-in-every-few-or-so type condition, but I got hit with it.
seems like noone can tell me if something special inside the mini-USB plug.
i realy cant charge. Very nice device, but i cant make it charging up whit cables.
guys, from up there, say that nothing special about the charging cables, but i trust what i see not what i read.
Perhaps there is a problem with your USB port on the device? USB charging has standards, and all devices that need power from a USB port have the same power pin configuration. Otherwise, they can't call it a USB connection. It would have to be called a proprietary connection, and they would have to change the plug size/dimensions and pins.
If there isn't a problem with your battery (which is the most likely source of your problem), then it may be a loose connection on your USB connector. This happens with a number of devices.
If a sync cable connects to the PC but will not charge the battery, then you definitely have an unusual pin detachment of some sort, or a bad battery.
thanks again..
for pity i was writing a lot to make my recent post and finaly it desapeared cause my session was left.. its funny in some case, but now i just dont want to repeat all what was intended to be posted
i give only the link where you might see why i was assuming that this is a kind of a special matter here with that htc 8125 charging
//pinouts.ru/CellularPhones-A-N/razrv3_charger_pinout.shtml
so, any more help will be appreciated a lot
thanks
SOLVED: HTC Wizard (Cingular 8125) Dead Battery Wont Charge
Dozzen said:
hi ! please forgive me for my bad english! in this case you can charge your phone in 1 way! you need to procure a motorola or any charger with same socket but attention the charger must have 6 volts and no less than 500 mAh(milli amps)! you cut the wires and one wire put on the + of the battery you will see the signs on the battery an one wire at the - no matter which one. and you need stay with the wires 3 - 4 minutes on the battery ! then you put the battery on the phone it will start and then you cand fully charge it with the usb cable ! good luckk ! i hope my inf will help you!
Click to expand...
Click to collapse
Hi - Too bad for the OP that asked questions but did not listen to this brilliant post.
I have confirmed that a variation of this method works perfectly! I have an old Cingular 8125 that I have been trying to charge for over a year using various USB chargers and NONE would charge the device.
The reason that this may happen is that the original charger has an output of 1 full amp which is much higher than most chargers. The voltage is the same but you need a charger that can handle such a strong current draw.
Nearly all USB chargers can only handle around 250milliamps - 500milliamps which is about half the power needed to breathe life into a fully discharged battery.
The best solution is to NEVER let the battery fully discharge.
Here are the details of what I did:
1. Find the best match charger of 5-6 DC Volts and ability to put out as close to one amp (1000mA) as possible. I chose an old Sanyo SCP-07ADT that is rated at DC 5.4V at 800mA. The plug can be any type, no need to be USB.
2. Cut the connector off the end of the cable and strip the outer black part up about an inch and then strip the positive and negative (red / black respectively) wires up about a millimeter, just enough to have bare metal ends to touch to a small area.
3. Take your battery out of the phone, look at the back of battery for the + and - marks which correlate to one of the metal connection points on your battery, this is where you will "touch" or "attach" the bare ends of the wires.
4. Plug the charger in making sure not to short your bare leads. Before you do this double check that the OUTPUT of your charger is indeed DC voltage so that you don't hurt yourself. You do not want AC output and it can be dangerous.
Then touch the bare end of the red wire to positive of battery, and black wire to negative terminal of your battery. I held them with my fingers while surfing the web for about five or ten minutes. I had no idea if anything was happening or not but it "felt" like the battery might have gotten just a bit warmer.
5. Unplug the home-made bare wire charger and put battery in your phone. Quickly attach a USB charger or just plug into a USB cable of your computer. I pushed it in and nothing happened at first but finally I heard the standard "bleep" when you plug a USB device in. I knew that I made progress because it never beeped before it took about 30 seconds and several "bleeps" of connecting/disconnecting from USB but eventually the charge light stayed on!
It's been about 30 minutes and I'm up to about 50% charge and been using the phone heavily while charging.
So, in summary... never let your battery discharge below 5% or you can only charge it with an OEM cable rated at 1amp (rare). IF you let it discharge to "dead" then charge for 5-10 minutes with the "wire" method and then charge normally!
Thanks to Dozzen for the original idea!!
Wizard that won't charge
When my Wizard/HTC 8125 goes dead my cure for the battery is to use a 9 volt charger with the wires stripped back also. But, my method is a bit different. I place a standard Christmas Tree light bulb (the newer small ones)in series with the charger wires. Observe the correct polarity. The battery is labeled + and - so that part is easy. By using the small light bulb you are doing 2 things. 1.You can see the slight glow from the bulb and know that proper connection is made. 2. You are limiting the charging current to the battery.
If you get really creative like I did you can solder a couple of small nails or in my case a set of red and black probes to the setup and the points on these nails/probes make for much easier connections. Note.... This method may take a few minutes longer but, is much easier on the battery.
In my experience once the battery is below a certain level NO charger that I plug in will work. I just purchased a used 8125 from eBay and brought it back to life most successfully with this method.
hy there my htc wizard battery whos dead so i charched with a cable with + and - the phone starts but when i try to connect to a usb or a adaptor it doesnt charge anymore it show me the charge icon on the baterry but it doesnt charge the usb works fine it's sync to my pc but it doesnt charge anymore... what sould i do?
So it seems no one touched on what really matters here.
A design flaw, in my opinion. The HTC Wizard cannot recharge via USB unless there is enough power to turn on. The reason is because it requires the OS to charge.
So, what many people already posted are very creative ways to charge your 8125. The easiest and cheapest way, in my opinion, is to use AA batteries.
1) Take two AA batteries and tape together so they are in series. Imagine it like this... [- AA battery #1 +][- AA battery #2 +]
2) Use two wires and tape one to each side of the AA's (one on the + side and another on the other battery's - side since the - of the first battery is connected to the + of the second).
--w-i-r-e--[- AA battery #1 +][- AA battery #2 +]--w-i-r-e--
3) Connect the positive (+) wire to the positive (+) side of the phone. By this I mean the 6 metal pieces that stick out to contact the phone battery. I did it by wrapping the wire around the top most one (or second top most, it's been over a year since I've done this.).
4) Connect the negative (-) wire to the negative (-) side of the phone. Again, bottom most or second bottom most (see #3).
5) Insert phone battery while the wires are still in and connected to the two AAs.
6) Let the power flow for 30 seconds or so and then try turning your phone on. This part is the important part because you cannot use a USB to mini-USB connected to your computer to charge the phone unless the operating system can function. Meaning, it needs to be turned on first.
7) Once the phone is on, plug in the mini-USB part and connect it to a computer. I'd recommend getting at least 5% battery before disconnecting the AAs, seeing as you need to be able to start up your phone long enough for the OS to boot. Once the OS boots, you can fully charge it through a normal USB to mini-USB connection on any computer.
old post but just wanted to say thanks. Used the wire to battery method and got phone turned on after 2 mins of holding wires to battery.
My battery discharged while I was travelling - it went to <10% and shut off by itself. I left the original HTC microusb over seas and so I used my old Motorola microusb to try to charge the phone. After leaving it overnight a number of times I thought the battery was dead. I ordered a new battery (from Mugen) and tried to charge that.
All I get is a flashing orange/red light. The phone does not turn on.
I have tried charging on both the AC charger and via PC usb port.
Are all MicroUSB cables universal? I can't get a straight answer about this from HTC's customer support. Every time I call someone gives me a different answer which leads me to believe that they have no clue what they are talking about.
Is there anything I can do to remedy this?
The HTC AC charger is rated at 5V 1A, while my old Moto charger is rated at 5.1V 850mA. Could I get a charge by using slightly higher voltage with lower amperes?
I really would like to avoid sending it back to manufacturer warranty so if there is any other alternate route I can take please let me know.
I have some cheap MicroUSB cables and they seem to charge very slowly compared to the HTC one. There may be a difference, but I suspect the cheap cables are just plain cheap.
No the Motorola charger wont have done it any harm, 0.1volt wont make a difference, and charging at a lower current is less likely to cause damage.
Could I have damaged the phone by using a different companies' cable?
Is there a chance that the phone is FUBAR? Should I be able to turn it on if its plugged into a power source even if the battery is dead?
please excuse the bump
need to know
*bump*
I've actually tried all the different combinations of charging and they all seem to work fine
I've tried a cheap microUSB cable with the official charger, official microUSB cable with iPhone charger, cheap microUSB cable with PC, another cheap microUSB cable in my friend's car, and even a Nokia microUSB cable in all the mentioned combinations
They all just gave different current readings (from CurrentWidget) but in the end they all worked well. I'm not sure if a Motorola microUSB would have modifications that cause incompatibilities though
I also tried different Micro-USB Cables and my DHD still works normally.
me too have the same problem. I got a total of 3 diff USB cable. One give me 330mA, one give me 120mA and one gave me only 50mA. i do not mind spending the money if i know how to choose a USB cable which can give me 330mA everytime i charge. Anyone knows how to spot the correct ones?
Neurosis said:
me too have the same problem. I got a total of 3 diff USB cable. One give me 330mA, one give me 120mA and one gave me only 50mA. i do not mind spending the money if i know how to choose a USB cable which can give me 330mA everytime i charge. Anyone knows how to spot the correct ones?
Click to expand...
Click to collapse
Any Blackberry USB cable should work..
used Motorola cable many times. No issues.
Might be a fluke that u busted ur phones charging system.
The USB cables are all the same and have no effect on charging current. The charging current is determined by how the two data lines within the cable are terminated in the charging device. If the data lines are left open ciruit, the phone interprets this as being a USB charger and will therefore only draw a maximum of 500mA to prevent damage to a PC's USB port. Chargers that are capable of delivering more current (such as a wall charger) connect the two data lines together. The phone then interprets this as being a charging device which is capable of delivering a higher current and will draw greater than 500mA. If you look at "Menu - Settings - About phone - Battery" it will state either "Charging (USB)" or "Charging (AC)" depending on what you are charging from.
Last night I was charging my S4 in my car adapter, but noticed the cattery was still going down. I went home and plugged it into my AC (wall charger) and went to bed. The next morning the S4 was dead and couldn't charge. The only solution was to plug it in my computer and went an hour for it to get some charge back.
I have a root i337m running rootbox 4.1, and I went into TWRP to wiped the phone and installed the ROM again - no luck.
Is this a battery issue, a software issue or a whole device issue? Thanks.
freddywhite said:
Last night I was charging my S4 in my car adapter, but noticed the cattery was still going down. I went home and plugged it into my PC and went to bed. The next morning the S4 was dead and couldn't charge. The only solution was to plug it in my computer and went an hour for it to get some charge back.
I have a root i337m running rootbox 4.1, and I went into TWRP to wiped the phone and installed the ROM again - no luck.
Is this a battery issue, a software issue or a whole device issue? Thanks.
Click to expand...
Click to collapse
I don't think its a rom issue. I tried charging via USB as well and had phone charging a few hours and it ate crap. So I only charge via AC outlet only. USB charges but at a very slow pace.
Reinaldo33897 said:
I don't think its a rom issue. I tried charging via USB as well and had phone charging a few hours and it ate crap. So I only charge via AC outlet only. USB charges but at a very slow pace.
Click to expand...
Click to collapse
I made an error in the OP - I meant to say I left it to charge on the wall and I got nothing.
Right now, the charge light doesn't even come on if I plug it with AC.
freddywhite said:
I made an error in the OP - I meant to say I left it to charge on the wall and I got nothing.
Right now, the charge light doesn't even come on if I plug it with AC.
Click to expand...
Click to collapse
Maybe see the results by changing the charger you're using?
r8revealed said:
Maybe see the results by changing the charger you're using?
Click to expand...
Click to collapse
I've tried 3-4 different chargers and cables, same issue. Charges slowly through PC,doesn't charge at all with AC. Did a factory reset after reverting to stock FW, no luck.
freddywhite said:
I've tried 3-4 different chargers and cables, same issue. Charges slowly through PC,doesn't charge at all with AC. Did a factory reset after reverting to stock FW, no luck.
Click to expand...
Click to collapse
I doubt it's a ROM issue, but there's no harm in reverting back to stock to see the results (assuming you've backed it up). If it all fails, i think you should unroot and send it to Samsung for the warranty. Software problems are somewhat easier to fix here than hardware, so it may be the best option to let Samsung handle it.
I had similar problems with my Note 2 before and now with my S4. What I found was, sometimes the usb cable wasn't tightly plugged into the wall charger. Once I've made sure of this, I've been able to charge (AC) every time.
I found this article that indicates that the S4 is looking for special sauce on the D+D- pins.
http://www.anandtech.com/show/6914/samsung-galaxy-s-4-review/2
Obviously the Galaxy S 4 will charge with any USB charger, but the charge time will simply be longer. Samsung uses a voltage divider and signals the presence of their own charger by sending 1.2-1.3 V across the D+ / D- pins, this is similar to what Apple does with 2.0 or 2.8 V across the pins for various USB chargers they've shipped over the years. This signaling is essentially Samsung's proprietary tablet charging signaling which they've employed on the Galaxy Note 2 and now SGS4, in fact the two use the same exact charger, so it's worth tossing out your old ones and getting the appropriate one to take advantage of the faster charging.
However I do not believe this to be 100% true. I think not all chargers will work..
I took a charger that is very vanilla (Wall charger but the D+D- pins are NC) and it works with the S3 and NEXUS7 but does not work with the S4.
This charger uses a stock USB cable so I took a wall charger that had gone bad but had a dedicated cable and hacked off the end and wired up my own cable...
That works! So it appears that the S4 will only charge properly with certain chargers that do something to the D+D- pins (either shorting them with a resistor like the article indicates
I then took a look at the cable I used to replace. It is a Motorola cable and it has the ID pin pulled high built into the cable... So I suspect that is required for the phone to work... But to fast charge it will need the special sauce indicated above!
Had the same issue and found the solutions which worked for me. Go into the developer mode and deactivate the usb debug mode.
Had the exact same issue. I took a soldering iron to my charging port on my phone. Problem solved. The ID pin had a bad joint.
Sent from my SAMSUNG-SGH-I337 using XDA Premium 4 mobile app
I have a strange issue, my s4 is detected by pc, charges normally with usb ( wall or pc charge ) my battery is full but when I take the cable from microUSB port and s4 should work with the battery, turns off and consumes no battery, it's like refusing to use the battery and that it is full! battery checked on a sph l 720
I've tried installing other roms with safestrap but I still have the same problem, refuses to consume battery and while the battery is at 100% ,my s4 shows 0% if I disconnect the usb cable... game over. However, I can be on the safestrap menu for hours only with the battery, no problem, is a problem of rom I think but did not know how to fix it .. : (
I'm having the same issue as the original poster. The USB port is good, charges fine when connected to PC (although much slower because of different mVS). Have tried amidst everything and nothing fixes it. I've turned debugging mode off and back on, restore to backup, complete wipe and reinstall of 2 ROMs with and without apps, fix permissions, different kernels, different USB cables... The adaptor is in good condition. But when plugged in while on my phone doesn't recognize that's it's connected. Previously out would give a false charging reading. If off sometimes I got the grey bar battery but note is just vibrating every few seconds. Idk what to do...
crazy_dr0id said:
I'm having the same issue as the original poster. The USB port is good, charges fine when connected to PC (although much slower because of different mVS). Have tried amidst everything and nothing fixes it. I've turned debugging mode off and back on, restore to backup, complete wipe and reinstall of 2 ROMs with and without apps, fix permissions, different kernels, different USB cables... The adaptor is in good condition. But when plugged in while on my phone doesn't recognize that's it's connected. Previously out would give a false charging reading. If off sometimes I got the grey bar battery but note is just vibrating every few seconds. Idk what to do...
Click to expand...
Click to collapse
I'd guess it's the charger. Get a new one
Sent from my Nexus 5 using XDA Free mobile app
I had the same problem. S4 will recognize charger as USB charger, not AC. solution was to clean usb port connector, was some cloth covering wires. then restarted and worked ok
I am having trouble charging the phone the same way. I have reset the phone 3 times and still can't get a charge.
Last week, I found that my nexus 7 (16g wifi only) start to charge really slow or even not charging. This happen after I upgrade my tablet to android 4.4.2(no root, no mod). I tried all the ways I could found on internet such as disconnect the battery and reconnect after few minutes, downgrade to android 4.3 or 4.2, changing to different type of charger and so on but failed.
After tried for few days, I was frustrated and decided to throw away the tablet. But 2 days ago, when I tried to charge the tablet with samsung galaxy tab2 7.0 charger, I manage to charge from 0% to 50% in two hour. I thought my tablet was back to alive but the tablet stop charging after 50% battery. I tried with oem 2A charger or cheapo china ipad charger and the charging starts but slow and sometimes not charging. I search online and found out that the samsung tab2 7.0 charger has 1.2V at both data pins and both data pins was shorted. I checked my asus oem charger and found out that both data pin was shorted but no voltage supplied.
I take a usb cable, strip and cut both data wire and short both data wire at micro usb side. I connect the tablet to the samsung charger and the tablet start charging and charge at normal speed to 100%. I thought that was the solution but yesterday, when I tried to charge the tablet which has 10% battery remains with samsung charger and my modified usb cable, the tablet charge, but in slow rate. I take half a day to charge to 50%. i exchange the moded usb cable with a normal usb cable and this time the tablet charge to around 80% in one hour. I was confused. Does my tablet need voltage of 1.2V at both data pins for the tablet to recognize as normal charger?
I start to do my experiment by using the oem charger. I apply around 1.2V by using resistors connect to the +5v and gnd. My tablet start to charge at normal rate that i can get the increment in battery % after 1 or 2 minutes in screen off mode. After charge to around 25% my tablet stop charging. I checked the data pins voltage and found out to be around 1.8V. 1.8V??? not 1.2V??? I check the resistors connection and disconnect my tablet from the usb cable. The data pins is now 1.2V. I connect my tablet back to the usb cable, wait for the tablet to start charging at normal rate and disconnect the data wires from the resistor. I tested with multimeter and found out that there was a voltage of 3.1V at data pins (shorted together) from the tablet when charging.
After a few tries by changing the resistors with different values to increase or decrease the data pins voltage, I manage to get a combinations that works well with my charger and my tablet charge normally. With the resistor combination, I get a voltage of 0.5V when no tablet connected and around 1.2V when tablet connected and start charging by using a resistor of 1Kohm connect from the +5V pin to the data pin and 100ohm connect from the data pin to the ground. Actually my tablet shows sign of normal charging when I apply 1V to 1.5V to the data pins that I choose 1.2V for full charging testing. I manage to charge my tablet from 0% to around 30% by using the samsung charger, 30% to 60% using the cheap ipad charger and 60% to 100% using the oem charger. No sign of stop charging or slow charging during the charging process. Maybe this is the solution to the charging problem?
I hope that someone which is more professional in this fields will try my way and give me the final results of the most suitable resistor combination or is my way of solution, or is this just an coincidence or my solution can only be applied onto my tablet? Warning: Try at your own risk.
fix foe nexus 7 slow charging
samuraiman said:
Last week, I found that my nexus 7 (16g wifi only) start to charge really slow or even not charging. This happen after I upgrade my tablet to android 4.4.2(no root, no mod). I tried all the ways I could found on internet such as disconnect the battery and reconnect after few minutes, downgrade to android 4.3 or 4.2, changing to different type of charger and so on but failed.
After tried for few days, I was frustrated and decided to throw away the tablet. But 2 days ago, when I tried to charge the tablet with samsung galaxy tab2 7.0 charger, I manage to charge from 0% to 50% in two hour. I thought my tablet was back to alive but the tablet stop charging after 50% battery. I tried with oem 2A charger or cheapo china ipad charger and the charging starts but slow and sometimes not charging. I search online and found out that the samsung tab2 7.0 charger has 1.2V at both data pins and both data pins was shorted. I checked my asus oem charger and found out that both data pin was shorted but no voltage supplied.
I take a usb cable, strip and cut both data wire and short both data wire at micro usb side. I connect the tablet to the samsung charger and the tablet start charging and charge at normal speed to 100%. I thought that was the solution but yesterday, when I tried to charge the tablet which has 10% battery remains with samsung charger and my modified usb cable, the tablet charge, but in slow rate. I take half a day to charge to 50%. i exchange the moded usb cable with a normal usb cable and this time the tablet charge to around 80% in one hour. I was confused. Does my tablet need voltage of 1.2V at both data pins for the tablet to recognize as normal charger?
I start to do my experiment by using the oem charger. I apply around 1.2V by using resistors connect to the +5v and gnd. My tablet start to charge at normal rate that i can get the increment in battery % after 1 or 2 minutes in screen off mode. After charge to around 25% my tablet stop charging. I checked the data pins voltage and found out to be around 1.8V. 1.8V??? not 1.2V??? I check the resistors connection and disconnect my tablet from the usb cable. The data pins is now 1.2V. I connect my tablet back to the usb cable, wait for the tablet to start charging at normal rate and disconnect the data wires from the resistor. I tested with multimeter and found out that there was a voltage of 3.1V at data pins (shorted together) from the tablet when charging.
After a few tries by changing the resistors with different values to increase or decrease the data pins voltage, I manage to get a combinations that works well with my charger and my tablet charge normally. With the resistor combination, I get a voltage of 0.5V when no tablet connected and around 1.2V when tablet connected and start charging by using a resistor of 1Kohm connect from the +5V pin to the data pin and 100ohm connect from the data pin to the ground. Actually my tablet shows sign of normal charging when I apply 1V to 1.5V to the data pins that I choose 1.2V for full charging testing. I manage to charge my tablet from 0% to around 30% by using the samsung charger, 30% to 60% using the cheap ipad charger and 60% to 100% using the oem charger. No sign of stop charging or slow charging during the charging process. Maybe this is the solution to the charging problem?
I hope that someone which is more professional in this fields will try my way and give me the final results of the most suitable resistor combination or is my way of solution, or is this just an coincidence or my solution can only be applied onto my tablet? Warning: Try at your own risk.
Click to expand...
Click to collapse
here's what i posted at google forums. hope it helps you
FIXED!!!
and i didnt wait for google to solve it. they take ages.
as one of the pioneers of this thread, trust me i have tried everything, and started solutions you can see if you back track a bit.
what does not work/or temporary works but not permanent:
>OS downgrading
>bootloader upgrading
>plug unplug with battery monitor (temporary)
>reseating battery cable
>changing chargers/cables/using OEM
>all else above
what works:
>dock
from what i observe, some symptoms of failure started prior to kitkat, as to some of the nexus' handled to me. and some kitkat dont have it.
and the dock works. led me to conclude it might be hardware, probably with the USB
THE FIX:
OPEN YOUR NEXUS 7 AND RESEAT THE USB CHARGING PORT FROM THE INSIDE. if you do not know how, this video will guide you:
(cannot post link) go to youtube and watch?v=m5FagzLdbbM
as you can see the 4:07 in the video is the most important, remove the usb port/audio port completely and reseat it, place it back tightly.
my tab was left at 0% charge, unable to charge anymore, so i was left with the option to tinker it. which to my delight, it charges now at 500-900mah. i tried to drain it and charge again charging-recharging 3 times before posting it here to make sure it was not sheer luck, and so it did.
its a hardware problem guys. i just wish google/asus had the courage to admit it rather than we find it ourselves. go ahead try it. post if it works
for you. it worked for me.
emanlee said:
here's what i posted at google forums. hope it helps you
FIXED!!!
and i didnt wait for google to solve it. they take ages.
as one of the pioneers of this thread, trust me i have tried everything, and started solutions you can see if you back track a bit.
what does not work/or temporary works but not permanent:
>OS downgrading
>bootloader upgrading
>plug unplug with battery monitor (temporary)
>reseating battery cable
>changing chargers/cables/using OEM
>all else above
what works:
>dock
from what i observe, some symptoms of failure started prior to kitkat, as to some of the nexus' handled to me. and some kitkat dont have it.
and the dock works. led me to conclude it might be hardware, probably with the USB
THE FIX:
OPEN YOUR NEXUS 7 AND RESEAT THE USB CHARGING PORT FROM THE INSIDE. if you do not know how, this video will guide you:
(cannot post link) go to youtube and watch?v=m5FagzLdbbM
as you can see the 4:07 in the video is the most important, remove the usb port/audio port completely and reseat it, place it back tightly.
my tab was left at 0% charge, unable to charge anymore, so i was left with the option to tinker it. which to my delight, it charges now at 500-900mah. i tried to drain it and charge again charging-recharging 3 times before posting it here to make sure it was not sheer luck, and so it did.
its a hardware problem guys. i just wish google/asus had the courage to admit it rather than we find it ourselves. go ahead try it. post if it works
for you. it worked for me.
Click to expand...
Click to collapse
thx mate .. how do you know what the actual charge rate is? on my Galaxy S3 there is an app for that, but can't find anything that works on this unit. thx
jj92942000 said:
thx mate .. how do you know what the actual charge rate is? on my Galaxy S3 there is an app for that, but can't find anything that works on this unit. thx
Click to expand...
Click to collapse
https://play.google.com/store/apps/details?id=ccc71.bmw
Nexus 7 slow charging problem
Thanks emanlee, worked for me. I thought my battery was weak. Made my day.
emanlee said:
here's what i posted at google forums. hope it helps you
FIXED!!!
and i didnt wait for google to solve it. they take ages.
as one of the pioneers of this thread, trust me i have tried everything, and started solutions you can see if you back track a bit.
what does not work/or temporary works but not permanent:
>OS downgrading
>bootloader upgrading
>plug unplug with battery monitor (temporary)
>reseating battery cable
>changing chargers/cables/using OEM
>all else above
what works:
>dock
from what i observe, some symptoms of failure started prior to kitkat, as to some of the nexus' handled to me. and some kitkat dont have it.
and the dock works. led me to conclude it might be hardware, probably with the USB
THE FIX:
OPEN YOUR NEXUS 7 AND RESEAT THE USB CHARGING PORT FROM THE INSIDE. if you do not know how, this video will guide you:
(cannot post link) go to youtube and watch?v=m5FagzLdbbM
as you can see the 4:07 in the video is the most important, remove the usb port/audio port completely and reseat it, place it back tightly.
my tab was left at 0% charge, unable to charge anymore, so i was left with the option to tinker it. which to my delight, it charges now at 500-900mah. i tried to drain it and charge again charging-recharging 3 times before posting it here to make sure it was not sheer luck, and so it did.
its a hardware problem guys. i just wish google/asus had the courage to admit it rather than we find it ourselves. go ahead try it. post if it works
for you. it worked for me.
Click to expand...
Click to collapse
emanlee said:
here's what i posted at google forums. hope it helps you
FIXED!!!
and i didnt wait for google to solve it. they take ages.
as one of the pioneers of this thread, trust me i have tried everything, and started solutions you can see if you back track a bit.
what does not work/or temporary works but not permanent:
>OS downgrading
>bootloader upgrading
>plug unplug with battery monitor (temporary)
>reseating battery cable
>changing chargers/cables/using OEM
>all else above
what works:
>dock
from what i observe, some symptoms of failure started prior to kitkat, as to some of the nexus' handled to me. and some kitkat dont have it.
and the dock works. led me to conclude it might be hardware, probably with the USB
THE FIX:
OPEN YOUR NEXUS 7 AND RESEAT THE USB CHARGING PORT FROM THE INSIDE. if you do not know how, this video will guide you:
(cannot post link) go to youtube and watch?v=m5FagzLdbbM
as you can see the 4:07 in the video is the most important, remove the usb port/audio port completely and reseat it, place it back tightly.
my tab was left at 0% charge, unable to charge anymore, so i was left with the option to tinker it. which to my delight, it charges now at 500-900mah. i tried to drain it and charge again charging-recharging 3 times before posting it here to make sure it was not sheer luck, and so it did.
its a hardware problem guys. i just wish google/asus had the courage to admit it rather than we find it ourselves. go ahead try it. post if it works
for you. it worked for me.
Click to expand...
Click to collapse
I have an old Nexus 7 and was about to toss it out because it wouldn't charge, this took 20 minutes and now it charges as it did when new - great.
Thanks.
emanlee said:
fix foe nexus 7 slow charging
here's what i posted at google forums. hope it helps you
FIXED!!!
and i didnt wait for google to solve it. they take ages.
as one of the pioneers of this thread, trust me i have tried everything, and started solutions you can see if you back track a bit.
what does not work/or temporary works but not permanent:
>OS downgrading
>bootloader upgrading
>plug unplug with battery monitor (temporary)
>reseating battery cable
>changing chargers/cables/using OEM
>all else above
what works:
>dock
from what i observe, some symptoms of failure started prior to kitkat, as to some of the nexus' handled to me. and some kitkat dont have it.
and the dock works. led me to conclude it might be hardware, probably with the USB
THE FIX:
OPEN YOUR NEXUS 7 AND RESEAT THE USB CHARGING PORT FROM THE INSIDE. if you do not know how, this video will guide you:
(cannot post link) go to youtube and watch?v=m5FagzLdbbM
as you can see the 4:07 in the video is the most important, remove the usb port/audio port completely and reseat it, place it back tightly.
my tab was left at 0% charge, unable to charge anymore, so i was left with the option to tinker it. which to my delight, it charges now at 500-900mah. i tried to drain it and charge again charging-recharging 3 times before posting it here to make sure it was not sheer luck, and so it did.
its a hardware problem guys. i just wish google/asus had the courage to admit it rather than we find it ourselves. go ahead try it. post if it works
for you. it worked for me.
Click to expand...
Click to collapse
Thank you very much, it has also fixed the issue to me. The tablet is not ready yet to become e-waste. Genius!