Strange OTG behavior - Nexus 7 Q&A, Help & Troubleshooting

I was making my own OTG cable and, after I finished connecting two cables together, I decided to test if it actually works, before soldering the jumper wire between the 4th and 5th pins. I tried it a few times and it worked. My mouse and usb stick were detected. Then, the launcher crashed. I waited for it to start up and tried again. This time everything worked without the jumper wire. Tried both the stick and the mouse and both worked for a while, after which I had to use the jumper cable again.
Did anyone else encounter this before? I was able to fully use both devices without the jumper cable for a while. Could it be possible to do a software hack and avoid having to solder the two pins?
I haven't been able to reproduce the thing again, but I'm gonna try again when I get home from work.
I'm running stock rooted 4.2.1.
Sent from my Nexus 7

Related

USB disconnecting periodically

So I got my Dinc a while back, been running fine. Rooted, running CM7 #32 at the moment, updating to #36 soon. And if I have my phone plugged it it will periodically disconnect if wiggled at all. I had a bad cord, for sure. So I bought a new one and it works better! BUT still disconnects if I wiggle it... and fix for this kinda stuff??
Sounds like a bad usb hub to me. Try a different one. If that doesn't work, try reinstalling the drivers.
Sent from my Incredible using XDA App
I've tried 3 third-party USB cords and none of them have been able to hold a consistent connection/charge. 2 of them seemed to work fine for a while but eventually became unreliable. I guess either the connectors degrade faster or the metal doesn't have as good of a contact.
Official included one is the only one that still works well.
The official one is the one that gave out on me. And its not just to my computer, its on the charger as well.
YMMV
While there is nothing anyone can say to this because it is definitely different for different people; I just had to buy ANOTHER charger because my prior one had gone out. I knew it was the charger and not the DINC because my wifes DROID2 also wouldn't show a charge light.
Something must be going wrong with these things; perhaps the wires are so small that they crimp super easy. I tried 3 charger "bases" (the nub that the USB cable plugs into that then plugs into the wall) (1 from Seidio, 1 that came with my DINC, and 1 that came with the DROID2) with the same cable, and none worked, on either phone. I didn't bother testing a new cable because it was fairly obvious what was what.
Bought a new charger (1 unit, not cable + nub) and both phones are back in business.

Should I return my tablet for a replacement? (USB port tough to use)

The full sized USB port on my Iconia Tab has an issue. I plugged in a device for the first time yesterday, plugging it in was hard, but not to bad. Unplugging the device from the tablet proved to be impossible without the use of tools. I finally managed to get the cable unplugged, but it still is rather hard to use the USB port. It also makes a bit of a clicking sound when removing a USB device/cable.
Anyone else have the issue?
If its a fresh device it may just be this way for a bit. But to be on the safe side just return it you could damage it and thy may not replace it then.
Sent from my ADR6400L using XDA Premium App
Yes, the USB port was super tight on my A500 the first time I used it. I thought I was going to break something when I pulled out the USB drive that first time. Same thing the next time I plugged in the USB drive, but easier than the first time. Plugged it in and out a few more times and now it goes in smooth.
My USB ports were really tight at first as well after some use the metal clips loosen a bit and they function normally, they speced them tight due to it being a mobile device they are planning it the things being plugged in getting bumped and pulled
While we're on the subject of USB port and pulling out peripheral devices ...etc
I own the Asus Transformer briefly ( returned due to screen bled ) and it has the option to "unmount" ( MicroSD through tablet & full USB through dock )
for us Iconia owners... without the option and by just yanking things out.... doesn't that increased the chances of damaging the usb drives and corrupting files ??
Markon101 said:
The full sized USB port on my Iconia Tab has an issue. I plugged in a device for the first time yesterday, plugging it in was hard, but not to bad. Unplugging the device from the tablet proved to be impossible without the use of tools. I finally managed to get the cable unplugged, but it still is rather hard to use the USB port. It also makes a bit of a clicking sound when removing a USB device/cable.
Anyone else have the issue?
Click to expand...
Click to collapse
yep mine is to hard to unplug too
Broken USB port
i noticed mine was like this at first but after a while it got easier to put in. until one day, my flash drive refused to go in all the way. I looked inside using a flash light and one of the gold pins had been bent back all the way. I live outside of the US so no warranty. I panicked and tried to straighten it back with a safety pin. It broke and fell out. I am now left without a usb port at all. any ideas on what to do?
I returned my first Tab because I thought the snug USB port was a defect, but the second Tab was just as bad. Over time the port has loosened a bit but I still have problems after all these months. Recently I inserted a mini wireless mouse USB dongle and I could not, for the life of me, remove it. I finally had to yank it out in pieces with a pair of pliers *shudder*. I still use a wired USB mouse and keyboard from time to time - but they have been tested several times and will unplug with minimal effort. I am very careful with flash drives though. I have one or two that work fine and they are the only ones I trust to use.
Sent from my A500 using xda premium
I have had two Iconias and both have had this issue. I don't think the newer one will help out with it. I use a 32gb USB device and it always hangs up in the port. But I don't use USB that often so my opinion is bias.
Yeah my USB port is super tight as well. The first time I stuck in a flash drive, I ended up pulling off the cover to the drive tying to get it out. After using it for a bit, it did loosen up some, but its still really tight. I just always use an extension cable now, at least that way I have something to grab onto to yank.
seems like a common issue. I also noticed the port was fairly tight at first, but after plugging in and out a few times, it seems to be broken in now - snug, but not overly tight. I use it for an external hard drive which is constantly being added and removed when moving from point a to point b.

[Q] Defy reboots after plugging in usb

I recently flashed my Defy with 3.4.2-179-2 CEE DEBLUR and it reboots every time I plug in my usb cable. It doesn't matter if it's connected to a PC or to the power adapter. Anyone have the same issue and know of a solution?
I did a google search and found someone complaining of the same issue but didn't see a solution.
More background:
I had an issue with my phone and when I went to do a factory reset I was stuck on the google screen. My power ended up running low to the point where I couldn't run the bootloader. I had to charge the battery manually with a battery charger and some wires. I monitored the voltage throughout to make sure the battery was ok. After flashing the new SBF I found that things worked fine except whenever I plugged in a USB cable it would reset. I put CM7 on the phone hoping it'd help but the problem still lingers.
I will probably attempt to flash another SBF or maybe reflash the existing one.
Does this problem only exists if the phone is fully booted or does it happen if you plug it in while booting also? Because if its happening while booting too maybe your usb cable is broken and theres a short in the cable that makes the defy reboot. Have you tried another cable? And what about plugging the cable in before booting the phone? Tried this already?
I encountered this problem occasionally before. Dunno why.
There's 3 possible issues here apart from software/firmware causes.
1) The USB cable might shorted.
- This can be confirmed by using multimeter to test the usb cable. You will see a shorting between to wire in the USB cable.
2) The Phone USB port might shorted.
- This can be confirmed by using another good/new usb cable and test it with multimeter.
3) Phone battery broken(happened when you charge it using wire and external charger).
- This can be confirmed by trying another Defy battery and charge it.
hi farsight,
upon further inspection i'm pretty sure the usb port is shorted because if i squeeze the bottom of the case the phone will reboot.
is there any way i could fix this? I've looked at some videos for the disassembly of the defy.
hi iregistry,
yes the issue occurs if the phone is fully booted and when it's booting.
quit risky la.. if under warranty, why not claim/RMA?
hi adie, i bought it new on ebay and i'm not sure how the warranty works on that.
[solved!]
after further testing I believe it was because the battery contacts were not as close together as they were originally due to me manually charging the battery. It must have been right on the very edge because it would work normally but just squeezing it would make it lose connection.
I used a pin to push the contacts closer together and hope this solves the issue. I've plugged in the usb and squeezed the case and so far everything seems ok.
IMO this is a poor design on motorola's part. the raised contacts on the phone are nice but the contacts on the battery are poor.
Thank you everyone for responding.
Had the same issue. Your solution worked on mine as well. Pushed the contacts on + and - in, and it worked! Thank you!
I had the similar issue. I had attempted to charge battery with external universal charger and looks like since then this issue where "phone would reboot upon unplugging the power source" started. Now as mentioned in this post, put the +/- pins bit closer and tried unplug and no issue observed so far.
Thanks. :good:
I too have the same issue. I tried to charge the battery with some direct USB.
Today I dropped the phone on my bed from 2' height and it got restart. But its quite surprise to see the effect of the USB plugin with the battery connector loosing up
I am thinking of putting a small alumunium wrapper on the +/- connector. Let see.

USB-OTG cable is having issues

Edit: problem solved. Word of advice to those having an issue with their cable, it most likely is missed wired
Advice to those looking for an otg cable or an otg cable solution, don't go for the super cheap ones, their wiring matches their price.
I am attempting to get an OTG cable (two actually) that I recently purchased to work but I'm having some issues.
I tried installing the USB-OTG Diagnostic tool to help figure out the issue. My N7 currently is running the Linaro _Motley Kerenel on a stock kernel that has been rooted and deodexed.
When I plug in the first cable that I have the highest hopes for the diagnostic tool reports that the kernel, rooted api, and the android api all claim support. However, the android api reports that it does not detect a device while the rooted api and kernel both do detect a device. However, it does report that the classes have been found.
The second cable causes the diagnostic tool to report that even on the kernel level no device is detected. I'm thinking this cable is defective in comparison to the first one.
The diagnostic tool's ultimate verdict is that OS support is a yes for cable one, but a no for cable two.
EDIT: When I plug in the first cable Superuser pops up saying that it has granted StickMount permission, even if there is just a mouse or even nothing on the other side of the cable. For the second cable no such message appears and the diagnostic tool even asks me if I connected anything after it is done, in comparison to the first which it automatically knows that I had connected something.
Is there any hints as to how to get these to work, though I do understand that the second most likely is defective and cannot be made to work.
wiggle the connector. I bought 2 OTG cables, only to find out the USB cable that came with my N7 (which fits tight as hell) is the only usb cable i own that will reliably seat in the port on the N7.
Wiggling the connector did not help at all. I don't think it is a connection issue as while both cables aren't as tight as the cable that comes with the N7, they do both sit firmly within the device itself.
In one of the many other threads on USB-OTG cables, one or more posters have reported having to shave the plastic on the top of the end that goes into the Nexus 7 because the sloped plastic of the Nexus 7 keeps the cable from being fully inserted. The micro USB end connector isn't long enough on some cables which seems to be causing issues of either the cable not working, being loose, or working intermittently.
Apparently he problem is far more benign than a software issue.
I ended up pulling apart cable two as it seemed defective and lo and behold it was. The sense pin (pin 4) wasn't connected to anything. After rewiring it I got it to preform better than cable one, that being it would power the device for a fraction of a second before cutting out and the diagnostic tool finally recognized it. Turned out that a short between the power pin and a data was causing the N7 to shutdown the connection. Fixing the short yielded a perfectly working cable.
I have yet to figure out what is wrong with cable one as it is of a different design and harder to test due to this.
Either way, this thread can be closed as it wasn't a software issue as originally thought. Just some really cheap cables. Let this be a lesson to me about buying those exceedingly cheap alternatives. Too good to be true.
Sent from my Nexus 7 using xda app-developers app

Problem recognizing charging, headset, and PC connection

Hello boys! I have a very serious problem with my LE PRO 3. Since yesterday, the following is happening BUG: When I connect the charger, it does not load immediately. It only loads if I reboot the device. And if I take it out and put it back, it stops loading again. This also happens when I connect to the PC. The device only recognizes if I leave the cable connected and restart. With the headset the same thing. It only recognizes if I leave it connected and restart the device. I'm on the Cydrass Google edition ROM, and my device is the x720 version. I have already switched to other ROMs (LineageOs, Ressuection Remix, and even the Chinese STOCK ROM 26s, and the problem still persists!) Apparently it's a serious problem recognizing my USB port I do not know what else to do! Please, help me!
even first buy , do you have problem ?
To Vitor_147
Remember, if you change the stock original LeEco rom you cannot say "have a problem with my LePro3", it's no longer the original combo "LePro3" (hardware + software) so expect (and accept) anything (better or worse!) and report the defects to the rom developer.
Now some helping things!
Apart to clean the phone usb c port and to try a new usb cable, you can:
With the usb cable connected, switch the usb debug off (or on) (developer options) then check if your computer detect your phone.
Even if your computer doesn't detect the phone or your phone seems not charging battery, if the usb cable (and charger) is good in 99% of the cases it charges the battery even if not at full charge rate (expect a minimum 4 hours charge time).
Before to give up, the last try is to bring your phone back to factory conditions with everything (but everything!) under the exact conditions of how it came out of the factory, then you can start over there and have an idea of whether the phone has a hardware defect or if it's just a matter of software.
I hope you solve the problem, if you find the right solution please report it here, so other users can learn how to solve this problem! Cheers!
orsonbear said:
To Vitor_147
Remember, if you change the stock original LeEco rom you cannot say "have a problem with my LePro3", it's no longer the original combo "LePro3" (hardware + software) so expect (and accept) anything (better or worse!) and report the defects to the rom developer.
Now some helping things!
Apart to clean the phone usb c port and to try a new usb cable, you can:
With the usb cable connected, switch the usb debug off (or on) (developer options) then check if your computer detect your phone.
Even if your computer doesn't detect the phone or your phone seems not charging battery, if the usb cable (and charger) is good in 99% of the cases it charges the battery even if not at full charge rate (expect a minimum 4 hours charge time).
Before to give up, the last try is to bring your phone back to factory conditions with everything (but everything!) under the exact conditions of how it came out of the factory, then you can start over there and have an idea of whether the phone has a hardware defect or if it's just a matter of software.
I hope you solve the problem, if you find the right solution please report it here, so other users can learn how to solve this problem! Cheers!
Click to expand...
Click to collapse
I already wrote this up in Omni thread, so I'll keep it short. I've also been experiencing this same issue for a while now, it first happened on stock rom, reboot solves it. Darko tried a fix in his eas kernel, seems to fix it (so maybe somehow kernel related). I believe it might be somehow related to the usb-c controller, cause I found cases online of similar issues with pixel phones (i believe the controller manufacturer is the same as in our phones). I actually know the exact moment when my problems first began, after I used my OTG adapter to connect a usb mouse. Few hours after that, the phone wouldnt charge.
{Disclaimer - this part is purely my theory}
I think it maybe somehow related to a safety "switch/fuse" of sorts, or something to do with static discharge or something similar, and here's why. I did a loot of trial and error since the first time it happened to me cause it scared the sh*t outta me, thinkin my phone is broken. I am vigilant about careful handling of usb ports and such, (ocd-ish really) so theres no way I physically damaged it, its not loose one bit, cleaned it out, tried wiggling the cable around anyway, has no effect, so I excluded the possibility of a faulty port/soldering. A few occurences to note
No1 - if I plug my phone in the charger first, and then plug the charger in the outlet, it breaks the port, I have to reboot to fix it. But plug the charger in the outlet first, then the cable to the phone - no problem. (Static discharge of sorts?)
No2 - since it started happening, the only way my usb-c OTG adapter works is if i first plug the adapter in the phone, and then the desired usb device in the adapter. If i try to plug the adapter in the phone w/say a usb stick already connected to it - no go, doesnt work.
Oh... I'm sorry for what happens to your phone! It's true the safest way to charge a phone avoiding current surge/spikes/shocks is to plug first the charger to AC outlet, then the usb c plug to the phone, then the usb plug to the charger. If possible, never plug/unplug the charger to/from the AC outlet if the phone is connected to the charger.
When the phone is full charged, first unplug the cable, not important which side first, then unplug the charger. If the phone is still charging, better unplug first the cable from the charger side to avoid micro spikes on the usb c port.
If you cannot obtain a normal behavior of the usb c port neither with reflashing the phone with the "qfil" system, perhaps a logic port of the usb c port is burned or simply in undetermined state, in the last case a total battery discharge may reset the logic port state and the phone can works fine once fully recharged. I'm sorry I can't help you better at this time! Cheers!
Sent from my LEX720 using XDA Labs
@orsonbear, thats my train of thought aswell, micro discharges occuring while plugging/unplugging causing the controller to freak out, or potentially damage the tiny connections (micro usb only had 4 wires vs 24! in usb-c). But I believe the problem lies somewhere on the software/firmware side, mainly because a reboot solves any issue I have. And also I just remembered, the first time it happened to me was a couple of days after I updated my firmware while updating to 19s, or 20s, cant recall precisely. Anywho, for me it's a minor nuissance, not like the OP who can only connect his phone once before rebooting (I can go for weeks before it occurs).
orsonbear said:
Oh... I'm sorry for what happens to your phone! It's true the safest way to charge a phone avoiding current surge/spikes/shocks is to plug first the charger to AC outlet, then the usb c plug to the phone, then the usb plug to the charger. If possible, never plug/unplug the charger to/from the AC outlet if the phone is connected to the charger.
When the phone is full charged, first unplug the cable, not important which side first, then unplug the charger. If the phone is still charging, better unplug first the cable from the charger side to avoid micro spikes on the usb c port.
If you cannot obtain a normal behavior of the usb c port neither with reflashing the phone with the "qfil" system, perhaps a logic port of the usb c port is burned or simply in indeterminated state, in the last case a total battery discharge may reset the logic port state and the phone can works fine once fully recharged. I'm sorry I can't help you better at this time! Cheers!
Sent from my LEX720 using XDA Labs
Click to expand...
Click to collapse
Yes,
I thought about letting the phone down completely, and see if that does not happen anymore!
Same problem here
Days ago it start happen, exactly how you say, i never change the stock software and it start happen randomly, I have to reboot to recognize anything that I plug into the USB c port, I try factory reset and change from 26s to 23s and it keeps happening so maybe I'm pretty ****ed, someone help me, in my country no one will fix the port u.u (sorry for my English).
Hellao! I'm having a very similar issue, charging works fine and the pc detects the phone but OTG and the audio on my headset is not working. Did someone of you find a solution to this problem?
1. x720, x722 or x727?
2. Where did you buy the phones? (Store names)
3. What kind of USB-C cable were you using? The one that came in the box? Have you used other USB-C cables and adapters to see if it works?
This could be hardware failure due to a lack of QCing from LeEco (just your average hardware issue) or a USB-C cable issue. It's ver. 1.0 on all LeEco Pro 3 models (right)? So I can't say it's the cable for sure. Has anyone attempted to take the phone apart to replace the port? do they even sell the port replacement?
Similar problem for me. About a month ago my headset stop working and the phone did not recognize it at all, tried with the adaptor to 3,5 mm jack and did not work either. Charging worked though.
Found a replacement chip with usb c port and ordered. Yesterday i replaced the charging port, but still the headset do not work at all, and connection to PC does not work ether. Charging still works as usual.
I ordered the phone from grossoshop 7 month ago with their rom. Tried this evening to upgrade the rom from 5.8.018 to 5.9.020, still grossoshop but no difference... It should not be a hardware problem as i replaced the type c port.
Should i try to flash another rom to see if there's any difference?
Any other suggestions?
Thankful for any ideas
Linkan78 said:
Similar problem for me. About a month ago my headset stop working and the phone did not recognize it at all, tried with the adaptor to 3,5 mm jack and did not work either. Charging worked though.
Found a replacement chip with usb c port and ordered. Yesterday i replaced the charging port, but still the headset do not work at all, and connection to PC does not work ether. Charging still works as usual.
I ordered the phone from grossoshop 7 month ago with their rom. Tried this evening to upgrade the rom from 5.8.018 to 5.9.020, still grossoshop but no difference... It should not be a hardware problem as i replaced the type c port.
Should i try to flash another rom to see if there's any difference?
Any other suggestions?
Thankful for any ideas
Click to expand...
Click to collapse
Have you tried switching cables? Could you have broken a contact or something while swapping the port out? Have you tried putting the old port back in to see if the computer recognizes the phone with it? Unfortunately you're gonna have to try everything, even if opening it back up again is tough. LeEco phones aren't exactly known for their build quality. Are you x720? Well, flash whatever ROMs you can, I guess. Might as well try everything.
sk8223 said:
Have you tried switching cables? Could you have broken a contact or something while swapping the port out? Have you tried putting the old port back in to see if the computer recognizes the phone with it? Unfortunately you're gonna have to try everything, even if opening it back up again is tough. LeEco phones aren't exactly known for their build quality. Are you x720? Well, flash whatever ROMs you can, I guess. Might as well try everything.
Click to expand...
Click to collapse
Yes, I have tried to switch the cables so no problem with them. Have not done a swap back again as the problem seem to be similar as before, so maybe a change to a different rom will be the next step for me. If change of rom does not work, maybe then I'll try to swap port again.
And yes, It's a X720
Thanks for fast reply.
Linkan78 said:
Yes, I have tried to switch the cables so no problem with them. Have not done a swap back again as the problem seem to be similar as before, so maybe a change to a different rom will be the next step for me. If change of rom does not work, maybe then I'll try to swap port again.
And yes, It's a X720
Thanks for fast reply.
Click to expand...
Click to collapse
Maybe it's not plugged in or attached correctly so the phone doesn't detect it. Sounds like a hardware issue to me, in all honesty. I once took apart my iPhone 5 to replace the non-functional home button and it wouldn't work no matter what I tried. I had to remove the battery, reseat it, and then attach the home button again. It finally worked after a reboot.
just report in on this thread, I as well recently purchased an x727 experienced the similar issue. Basically as described above no matter what roms i test is always have some sort of camera errors when charging.
sometimes charging doesn't work or camera doesn't work I have to reboot to get it to work. extremely annoying. I think it is hardware related.
Anybody else have a solution?
blanktape said:
just report in on this thread, I as well recently purchased an x727 experienced the similar issue. Basically as described above no matter what roms i test is always have some sort of camera errors when charging.
sometimes charging doesn't work or camera doesn't work I have to reboot to get it to work. extremely annoying. I think it is hardware related.
Anybody else have a solution?
Click to expand...
Click to collapse
i got charging problem dude after second day of use just got it last night x727.ffs.
i replace the usb board and the problem persist, i don't know what to do anymore, if someone has passed this problem please speak I am about to smash this damn bugged phone
Anthp said:
i replace the usb board and the problem persist, i don't know what to do anymore, if someone has passed this problem please speak I am about to smash this damn bugged phone
Click to expand...
Click to collapse
This my advice to anybody considering buying this phone don't why you will get zero support from letv.
I got luckey I have zero problems with phone .
I recommend spending more money and getting a supported phone by the maker.
If you do buy one buy it from Amazon where get a warranty on it.
Sent from my LEX727 using xda premium
Somebody fixed thuis allready as my le2 x626 only detects charging by USB when in fact its connected to the AC adapter.
And extremly slow charging from 9 to 100 % more then รณ hours.
Also the phone`s microphone is nog working at all!! And the headphone is nog working!
please help

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