Hi,
I got two old Nexus 9 units, almost unused. I'm thinking of installing them in my old car for music and navigation. Some years ago I did the same with Nexus 7 (2012) using Timur's rom, it worked for a few years until tablet died. Anyway I'm familiar with the rooting, cabling and so.
Not surprisingly, first issue is the otg + charging issue. I read all relevant threads in xda but could not find the bottom line: Did someone manage to do that and how.
Since I've two units I can try to mod one for no-battery operation. Again the same question: was it done and how.
Thanks!
i'd be interested if you were to do a battery bypass mod. Even doing a simple removal of the battery, may be able to solder a 5v step down direct to terminals of device then can hard wire to 12v via any real means.
I'm also very interested in this topic.
OTG + charging capability in a Nexus 9 ROM or a "How to" battery mod write up.
Related
I did a quick search to see if anyone had this issue. Most chargers output 5.0 volts while the Touchpad charger outputs 5.3volts. While my problem is with a Nexus S, I think this will be of interest to Touchpad owners given the possible cause.
The other day I accidently used my Touchpad charger to recharge my Nexus S. Afterward, everything seemed fine until I attempted to connect it to my laptop to offload some files. While it worked the day before, my laptop (Windows 7 64-bit) no longer discovers the device. Suspecting a problem, I connected to another PC running Win7 32-bit and a Mac running Snow Leopard. All with Android SDK and drivers properly installed with the same result. The same goes if I first put the Nexus in bootloader mode.
What makes me think there may be hardware damage is this. If I power off the Nexus S, then plug in a charger or USB cable, the phone boots. I do not believe it did so before. In addition, in the past if I plugged a charger or USB cable the LCD would briefly light up. After the incident, it doesn't. It still charges though.
Not necessarily looking for answer here, just thought this might be a word of caution for those like me who own both devices.
It should'nt have
5.3 V instead of 5V = not a big enough difference to cause a problem
2A instead of 1A means nothing regarding your current (no pun intended) problem
Plus your nexus S has charge protection to protect it from incompatible chargers
I use my TP charger to fast charge (because of the 2A thing) my GS II and my wifes HTC desire
However Fast charging is not good for the long term life span of the battery
Nomedias said:
I did a quick search to see if anyone had this issue. Most chargers output 5.0 volts while the Touchpad charger outputs 5.3volts. While my problem is with a Nexus S, I think this will be of interest to Touchpad owners given the possible cause.
The other day I accidently used my Touchpad charger to recharge my Nexus S. Afterward, everything seemed fine until I attempted to connect it to my laptop to offload some files. While it worked the day before, my laptop (Windows 7 64-bit) no longer discovers the device. Suspecting a problem, I connected to another PC running Win7 32-bit and a Mac running Snow Leopard. All with Android SDK and drivers properly installed with the same result. The same goes if I first put the Nexus in bootloader mode.
What makes me think there may be hardware damage is this. If I power off the Nexus S, then plug in a charger or USB cable, the phone boots. I do not believe it did so before. In addition, in the past if I plugged a charger or USB cable the LCD would briefly light up. After the incident, it doesn't. It still charges though.
Not necessarily looking for answer here, just thought this might be a word of caution for those like me who own both devices.
Click to expand...
Click to collapse
I've been charging my Nexus S 4G as well as a couple of other android phones (Samsung Vibrant and Samsung Epic) regularly without issue for a month or so. I doubt the Touchpad charger was the issue.
I've been using the touchpad wire to charge my evo 4g for over amonth and it's still fine.
Thanks for the feedback guys. Now I'm stumped as to why it happened. It is definitely something lower-level than OS, given the boots-when-plugged-in behavior.
End result is I can only transfer files wirelessly, and since I recently reverted to stock, I can't root it again. Hopefully, the official ICS update is an OTA, and not via USB (like froyo on Samsung Vibrant). If not, I'll seek warranty replacement.
Sent from my Nexus S using xda premium
It hasn't effected my nexus s
even though the charger is higher rated im pretty sure the phone only draws the maximum that is safe.
Just a thought: have you been using the same data cable to test this the entire time? It is possible for a cable to charge but not be able to transfer data. You may want to try a different cable just in case... just an idea.
jake921660 said:
even though the charger is higher rated im pretty sure the phone only draws the maximum that is safe.
Click to expand...
Click to collapse
Voltage is "given" by the charger and current is "drawn by the device.
High overvoltage would be dangerous but not 0.3v!
The charger could be faulty and have affected the TP while still being usable for other devices.
And the TPs dont like under current charging either.
cpenticuff said:
Just a thought: have you been using the same data cable to test this the entire time? It is possible for a cable to charge but not be able to transfer data. You may want to try a different cable just in case... just an idea.
Click to expand...
Click to collapse
Forgot to mention I tried different cables as well. The same cables transfer data to/from other devices like my Touchpad, but not the Nexus S. Good idea though.
Sent from my HP Touchpad using xda premium
I've been charging my htc windows phone with the touchpad charger. It's almost twice as fast and i haven't had any problems.
I have been temped to use it but. the NS charger gives 700ma while the TP gives 2000ma, If you want your battery to live more years use the stock.
I even use the NS charger to charge the touchpad... it will charge to 100% during the night.
I use my 2A Galaxy Tab charger to charge everything, never had a problem. If my SGS2 is happy with it, the Nexus S shouldn't have a problem either.
Amperage is how much current the charger is capable of supplying, the device plugged into it won't necessarily draw anywhere near that much, I'd be surprised if any regular phone would draw as much as 1A while charging.
Put a multimeter across any 5V charger and you'll probably find it's putting out anywhere from 4.5V to 5.5V unless it's a particularly good quality one. If it's high current charger then it's more likely it'll have a more stable voltage under load (i.e. - while charging).
A +/- ~10% difference in charging voltage should be within tolerance for pretty much any electronic device.
I also use the TP charger for my Sensation, no problems.
Sent from my Sensation using Tapatalk
robrob777 said:
I have been temped to use it but. the NS charger gives 700ma while the TP gives 2000ma, If you want your battery to live more years use the stock.
I even use the NS charger to charge the touchpad... it will charge to 100% during the night.
Click to expand...
Click to collapse
Sorry to correct you, but, current is drawn by the device and it will only draw what it needs so there should be no problem
Have you tried blowing out the usb port on your phone or cleaning the connection?
thebadfrog said:
Have you tried blowing out the usb port on your phone or cleaning the connection?
Click to expand...
Click to collapse
Thanks, but no it didn't work.
Sent from my HP Touchpad using xda premium
Nomedias said:
I did a quick search to see if anyone had this issue. Most chargers output 5.0 volts while the Touchpad charger outputs 5.3volts. While my problem is with a Nexus S, I think this will be of interest to Touchpad owners given the possible cause.
The other day I accidently used my Touchpad charger to recharge my Nexus S. Afterward, everything seemed fine until I attempted to connect it to my laptop to offload some files. While it worked the day before, my laptop (Windows 7 64-bit) no longer discovers the device. Suspecting a problem, I connected to another PC running Win7 32-bit and a Mac running Snow Leopard. All with Android SDK and drivers properly installed with the same result. The same goes if I first put the Nexus in bootloader mode.
What makes me think there may be hardware damage is this. If I power off the Nexus S, then plug in a charger or USB cable, the phone boots. I do not believe it did so before. In addition, in the past if I plugged a charger or USB cable the LCD would briefly light up. After the incident, it doesn't. It still charges though.
Not necessarily looking for answer here, just thought this might be a word of caution for those like me who own both devices.
Click to expand...
Click to collapse
It's not the extra voltage. Either user error, reread guides... or hardware, cant't help you.
Nomedias said:
I did a quick search to see if anyone had this issue. Most chargers output 5.0 volts while the Touchpad charger outputs 5.3volts. While my problem is with a Nexus S, I think this will be of interest to Touchpad owners given the possible cause.
The other day I accidently used my Touchpad charger to recharge my Nexus S. Afterward, everything seemed fine until I attempted to connect it to my laptop to offload some files. While it worked the day before, my laptop (Windows 7 64-bit) no longer discovers the device. Suspecting a problem, I connected to another PC running Win7 32-bit and a Mac running Snow Leopard. All with Android SDK and drivers properly installed with the same result. The same goes if I first put the Nexus in bootloader mode.
What makes me think there may be hardware damage is this. If I power off the Nexus S, then plug in a charger or USB cable, the phone boots. I do not believe it did so before. In addition, in the past if I plugged a charger or USB cable the LCD would briefly light up. After the incident, it doesn't. It still charges though.
Not necessarily looking for answer here, just thought this might be a word of caution for those like me who own both devices.
Click to expand...
Click to collapse
I am having the exact same problem. My phone does not boot on its own when I connect the USB cable, which is a slight difference from what you described, but everything else is identical.
I hadn't previously thought of the Touchpad charger being the root of the problem, but after Googling "Nexus S charging but not USB connection," I came across this thread...and wouldn't you know, I've been using my Touchpad charger for the past two nights.
I haven't made any changes to my phone in the last two days. The only thing different from my normal routine was Touchpad charger.
May I ask, why touchpad can not charge with USB port on computer, only charge with hp touchpad charger ?
Ok guys and girls, this thread is for hardware hacks. The reason for creating this thread is initially to address two scenarios.
Bricked device
HBOOT/Recovery Mismatch
And the goal is to produce two things.
JTAG pinouts for the flyer
Build a low cost emergency charger that can be used to recharge a completely flat flyer battery in order to recover from the unbootable state.
A bootstrap battery pack to be used as an alternative to #2, giving enough power to flash the correct recovery and charge normally.
I will be working on item 2 in the two lists first ( and number 3 on the second list) , because it's both a more common thing to encounter and because I need equipment that I don't currently have for number 1.
Did you search the DEV section before creating this thread? I swore I seen a couple of threads talking about this.
Another nice thread Globatron, do you think you could give a short description about what a Jtag/ort jtag unit is for people that aren't familiar? Too avoid those repetitive questions..
Sent from my HTC Flyer.
Sure, I'll do that.
Here's a visual tear-down of the Flyer from TechRepublic for those that have never opened it up.
http://www.techrepublic.com/photos/...3?seq=2&tag=content;siu-container#photo-frame
Man. This is really not like tearing a Laptop or a PC. After such tear up i don´t think i could get it all back together. All parts ant connections are so small, i don´t even see what part to connect to JTAG pins. And yes the screwdriver a shape of a star
Ok, so for the charger design there are two basic options and one extended option:
USB powered
Mains brick powered
Both, mains power taking priority if both are connected
Can I get a feeling of what people would like to see in terms of supply? I will not be using the flyer charger as a power source due to the problem of obtaining the custom connector to mount on a pcb but I can do a wide-rage input to cover ~ 5V - 28V.
The booster battery method is simpler. I'll have a prototype done as soon as I get a delivery of the appropriate connectors.
A couple more software procedures and then it's back to hardware.
Hubless USB OTG is added to the list.
Happy New Dragons Year Everyone!
I made some posts in riff box forums. I've visited jtag repair services and no one could help me. And i found that jtagers have no interest of flyer
Be more specific
globatron said:
Hubless USB OTG is added to the list.
Click to expand...
Click to collapse
What do you mean by that??
OTG without using a powered hub.
Elfuente said:
What do you mean by that??
Click to expand...
Click to collapse
He means that he is adding it (eliminating need for powered hub) to his list of HW mods to be looked at.
globatron said:
OTG without using a powered hub.
Click to expand...
Click to collapse
Yes I want that.!!!!!!! Where is the 'How do'
PLEASE!!!!!!!
There is no how to, you can't do it. That's why he is investigating. The Flyer as designed supplies less than 80ma of power to the micro USB port, not even enough for most small thumb drives.
Ok, so I'm completely noobish on this topic. From what I've read, I THINK the DNA needs to charge using the Qi standard.
My main question comes down to this - I have the DNA and a Nexus 7. The Nexus I'm sure needs a special case to be compatible (right?). Is there a mat that could be used to charge both simultaneously? The Verizon website only shows me the Nokia DT-900 which only looks big enough for the phone, and probably not the Nexus even by itself.
Is there an idiot's guide to wireless charging I could read? Or maybe someone who has both devices and already solved this problem? Thanks and sorry if I rambled.
Edit: After a little more searching, it appears the Nexus 7 can't be wirelessly charged without a hardware mod. This thread should probably be closed.
I got the DNA on Friday and the Nokia DT-900. It works flawlessly with the phone.
Hi guys I hope you can help.
I AM OFFERING A REWARD OF £10 GBP TO THE FIRST PERSON WHO SUCCESSFULLY ADVISES OF THE RIGHT FIX FOR THIS ISSUE *.
There, now I have your attention - brace yourself, this one’s a tough one.
About 2 months ago, I flashed DeltaROM 4.2.2 V2.2. I’m a serial flasher so I’m quite aware of what I’m doing. I had some issues with it that I tried to get support from them but they unfortunately didn't get back to/couldn't help me.
The original post is here in case you’re interested, the biggest issue being my S3 no longer charges correctly. If I plug a charger in from the mains, it will not register as charging. Once every 10 seconds or so, it will actually register the charger, but only for about half a second before it drops. It DOES however charge if I connect it to PC, Xbox or car (only wrks in the car if charging from a USB socket, using the in-car charger straight from the cigarette lighter doesn’t work). Basically, I can charge my phone off anything that isn’t directly the Mains electricity.
I’ve googled the hell out of this problem, only to find that posters will quickly dismiss it as faulty hardware; bad USB cable, broken USB port, bad charger, low voltage from mains – anything at all. But the bottom line is I do not have faulty hardware. Everything was absolutely fine until the very instant I finished flashing DeltaROM – I’m convinced something didn’t go right during my first installation since it was a bit rocky (read the original post for details).
After getting no answer from the Delta lot I jumped ship to LiquidSmooth (which is very nice by the way) but the problem remained. In one last attempt I started again from scratch. I used TriangleAway, formatted EVERYTHING (the kind that also deletes all your media) and flashed back to stock. Using Samsung Kies I 'upgraded' the firmware and I'm now on the latest official 4.1.2 release – and it makes me a little sad!
Just to back up the fact it’s not hardware related, I deliberately persevered with it to gather up as much information as I could, and here’s what I learned:
Why I'm sure it’s not the battery.
• I've tried two other batteries (3 total) and the problem exists with all 3
• The health of my battery is excellent
• My battery charges fine in other phones
Why I’m certain it’s not the Charger
• One of my chargers is only a couple of months old
• The charger I have been using is the official Samsung one that came with the phone, though I have 3 more – one BlackBerry one, a charger that came with my s1 (many moons ago) and two the same that came with mine and my gf’s phone. These are the plugs with a USB input on them,
• I have 5 chargers in all – BlackBerry, Nokia, Samsung (x3) ALL of which don’t work with my phone but ALL of which work with EVERY other phone in the house.
Why I’m sure it’s not the wall Socket.
• I’ve tried every plug socket in the house and even taken it to my parents and to work – same story.
• Everything else I plug into the sockets work just fine
Why it’s not a bad USB cable.
• I have 3 that I use. All of them will charge off of the computer, the car or the Xbox – they cease to work when I use them in the mains USB plug.
• They all work fine on every other phone in the house, regardless of if it’s in a mains adapter or a computer
• I am able to connect with all 3 cables to my laptop to view files.
Why I don’t think it’s a damaged USB port on the phone.
• It ‘does’ actually do everything it needs to do when plugged into my pc, Xbox or car. If it’s communicating well with other devices and harbours electricity correctly when doings so, then it can’t be the USB port since the way it gathers energy is the same.
So what gives? How can it be bat hardware if it works from the PC? How can it be bad firmware when I am back to Stock?
Thanks a million guys.
* Telling me to send it off for repair doesn't count. If it's something that I can do at home and it fixes my issue, the first person who gave that advice will be the winner. This does of course mean that if my phone is just downright screwed, there's a chance no-onw will win.
Have you tried to use a kernal like siyah kernal and change the chrging parameters for ac charging? (the Mah value for charging off wall socket...
Sent From Pure Awesomeness ....
Koogly said:
Have you tried to use a kernal like siyah kernal and change the chrging parameters for ac charging? (the Mah value for charging off wall socket...
Sent From Pure Awesomeness ....
Click to expand...
Click to collapse
Hi Koogly
Sorry probably should have mentioned this. I tried siyah and set everything to charge as much as it could - AC and USB. I also tried a lot of other 'fast charge' apps to no avail.
While the USB does charge, it's still quite slow at 460mA. Once in a while, the mains charge stays connected, and you can watch the mA level drop. It will start at around 999, but within 10 seconcd it will decrease down to 100mA, which is slower than the phone actually uses up energy.
Nobody?
I thought I'd throw this out here to whoever is interested in a similar install.
It's been a long while trying to figure out how to get my nexus 10 working otg without draining the battery. So, what I did was eliminate the battery all together and run it with a regulated power supply soldered to the positive and negative pins inside where the battery clip would normally go. Everything ran smooth without any errors whatsoever, then came time to test it all out by plugging the otg cable. what do you know, it worked flawlessly.
I'm able to run a usb hub with 3 flash sticks and 1 ssd hd. Hub must be powered separate with the power plug. This is a perfect setup for my situation since the tablet is installed in my truck and I wasn't too happy with the idea of having a lithium battery inside on hot summer days.
I'm pretty sure this method could even work while keeping the battery installed inside connecting the leads to a double throw relay along with a separate plug that would separate the two power sources.
Testing also passed while plugging it to the pc foe file access and debugging mode.
Hope this helps some people. Don't be shy if you need to ask any questions on this project.
Later
A pc usb port puts out 5v 500ma wich barely keeps the Nexus10 battery level
The ac charger puts out 5v 2amps
I hope your power supply is putting out same amps..
Sent from my Nexus 10 using XDA Premium HD app
Asylum01 said:
I thought I'd throw this out here to whoever is interested in a similar install.
Hope this helps some people. Don't be shy if you need to ask any questions on this project.
Click to expand...
Click to collapse
Hello Asylum,
I'm indeed interested in your setup, since OTG+charging is not possible with traditional methods (even pogo cable doesn't work along with OTG).
If I clearly understood, you opened your nexus, removed the battery and directly soldered cables + and - ?
Is it a complex operation ? (in particular to open the nexus and close it without tearing it down).
Do you have a photo of your installation ?
Thank you for your help :cyclops:
LeDuke
I'm also interested in this setup and would love to see pics!
Not to sound like a d1ck or anything, but I have a alternative. Just make a otg cable with a male and female USB ends and just hook up the male end to power lines. Them you can just use a regular USB wallwart to profile power to your drive.
I used this method to run a 1tb external HDD.