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Post by antc101 on Aug 10, 2016 18:02:24 GMT
Hi,
Was directed here by Kev a few days ago because, like the post before me, I did the no battery mod. Whilst it reads 100% battery and powers up no problem, when the OTG cable is connected the battery symbol shows charging. However, when power to the OTG is cut the battery still shows charging and won't go into suspend mode. The only way to make the tablet suspend is by disconnecting the OTG cable.
It's a Nexus 7 2013 wifi, on 6.0.1 running Timur's Kernel 4.0 RC.
I've tried troubleshooting using a normal wall plugs as well as in car USB powered adapter (without a LED) by the ACC switch. I've read on here that a stepdown converter is needed - I get the theory and how it works, but I'll be damned if I could figure out how to implent it on my own without a fools guide. I mean, does it go on the OTG end, or the usb cable to battery end? I don't know.
Any guidance is GREATLY appreciated.
Thanks a lot, Antony
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Post by antc101 on Oct 17, 2016 14:01:01 GMT
I know no one has replied to my post above, but thought I'd post an update.
I bought a drok dc dc usb module, and run the battery constant at 4.62v. Now I have no problems. However I then had problems where usb devices, namely my backup cam, wouldn't activate after resuming from sleep. The tablet would have to be in sleep for a certain amount of time for it to stop being recognised.
I have since fixed this, turns out it was timurs kernel. I installed elemental x and everything is working perfectly. Thought I'd post this here because if I posted this over at timurs reddit sub I'd probably end up banished.
Hope this helps anyone who may experience this in the future.
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Post by viking on Oct 19, 2016 10:44:51 GMT
The battery should be 3.7-3.9 volts As long as you use DC-DC converter, why don't you set it at 3.9v instead of 4.62v?
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Post by toxxic on Nov 13, 2016 6:13:41 GMT
Guys I know people have been having problems with getting sleep function to work on nexus 7 2012 when connected to car battery but i think ive fixed it.
All i did was use a 12v to 3.7v dc/dc converter. I think this is important since on nexus 7 2012 battery it states that max voltage 4.2V. So when you buy DC/DC converter make sure its 4.2 or below.
Spliced the inside black ground wire from the 6pin connector and connected to battery ground.
Voila. USB Sleep etc working great. Im running latest timur for nexus 7 2012. So still on kitkat. USB OTG devices working great.
I have great advantage as I have bluetooth and aux connection in my factory radio and also 2 batteries powering my land rover lr3. Therefore my nexus is connected to my secondary battery and sound plays through factory radio via aux and when I receive or make calls factory radio gets muted.
Also a couple of mods i did is that I mounted nexus 7 where factory nav screen was. Took out speaker grill from back cover and made charging port + headphone jack come out from there so its perpendicular to the tablet. It was necessary since I have 2 air vents next to screen and not enough space to connect cables past the sice of the tablet.
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Post by joel61 on Dec 1, 2016 5:42:12 GMT
Hey guys! I have some exciting news for Nexus 7 2012 users! I found A way to keep it plugged in and keep it always charged either with the battery or without it. I am just doing some final testing, but then I will write a guide on it. That means none of the normal problems that we have been having. Anyway, stay tuned!
(https://www.youtube.com/watch?v=zmd5Sf_1utU&feature=youtu.be Will make thread about this soon)
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ea
New Member
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Post by ea on Dec 19, 2016 6:55:14 GMT
Hi All New to the Forum. So i have done the no Battery mod on my Nexus 7 2013 running Timurs Kernal, it was all working however today after work i get in the car and it wont start up i double tapped the screen and a battery symbol came up. It was about 30+ in the car (adelaide) and seemed it had overheated. I assume this is a safety protocol to shut down when the tablet is overheating But i thought removing the battery would avoid this issue? Any Ideas? thanks
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Post by Admin on Dec 19, 2016 7:33:22 GMT
Hi All New to the Forum. So i have done the no Battery mod on my Nexus 7 2013 running Timurs Kernal, it was all working however today after work i get in the car and it wont start up i double tapped the screen and a battery symbol came up. It was about 30+ in the car (adelaide) and seemed it had overheated. I assume this is a safety protocol to shut down when the tablet is overheating But i thought removing the battery would avoid this issue? Any Ideas? thanks Your right, sounds like the N7 overheated, although the battery is removed, if the temperature gets too hot the N7 has other mechanisms that will protect it, taking the battery away does help to an extent .. but if other factors are making the temperature in the car too hot then the N7 will shut down ..
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Post by stavkon on Dec 29, 2016 20:06:53 GMT
Hi, I've done the no battery mod to my 2013 nexus and everything works fine. I did have issues in the beggining mainly to the long cables and usb connectors I initially used. When I cut them down and tied them together instead of using USB connectors everything sorted out. I also use an on/off switch to cut power from constant 12v when I am not using the car for a few days to minimise battery drain. The only problem I am facing now is the power cut when I am cranking the engine. I read in the previous page about a step down converter with bigger capacitor but as I am no electrician a more comprehensive step by step guide to do such a mod (or another one to avoid nexus restarting during cranking) would be very helpful.
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Post by moiloon on Mar 6, 2017 20:02:32 GMT
Hi, I've done the no battery mod to my 2013 nexus and everything works fine. I did have issues in the beggining mainly to the long cables and usb connectors I initially used. When I cut them down and tied them together instead of using USB connectors everything sorted out. I also use an on/off switch to cut power from constant 12v when I am not using the car for a few days to minimise battery drain. The only problem I am facing now is the power cut when I am cranking the engine. I read in the previous page about a step down converter with bigger capacitor but as I am no electrician a more comprehensive step by step guide to do such a mod (or another one to avoid nexus restarting during cranking) would be very helpful. not sure if you got this sorted, haven't done the no battery mod yet myself, but for cranking issue on my diesel (heater plug cycle) I used a 5v time delay relay in the 5v+ powering the tablet y cable, and delayed power for 15seconds this works perfect, as prior to this cranking was messing deep sleep/start up something ridiculous
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Post by moiloon on Mar 6, 2017 21:48:08 GMT
just a quick question regarding the no battery mod 2013, what would happen if both powers were connected to ign live? must 1 be permanent? could tablet not boot? or something else? reason I ask is my setup is pretty much working perfect at the moment other than my tablet drains over a few days to flat,if car not used so prefer the battery gone, but also not fancy putting another 12v to 5v live to my cars fusebox
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Post by Admin on Mar 7, 2017 18:38:19 GMT
just a quick question regarding the no battery mod 2013, what would happen if both powers were connected to ign live? must 1 be permanent? could tablet not boot? or something else? reason I ask is my setup is pretty much working perfect at the moment other than my tablet drains over a few days to flat,if car not used so prefer the battery gone, but also not fancy putting another 12v to 5v live to my cars fusebox If you didnt connect a permanent +12v, then it will be like the battery will be flat in yoru N7 every time you turn off the ignition, so the N7 would then need to power up every time you turn the ign on .. its not a great way to keep applying power to your N7
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Post by moiloon on Mar 8, 2017 12:56:47 GMT
thankyou for your clarification
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bexus
New Member
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Post by bexus on Jul 9, 2017 15:20:37 GMT
Got a couple questions. I have my spare battery taken apart and Im ready to build the power hook up. Im working on an 2012 model N7. Do you know if I have to do the second black wire hookup? Not sure Im understanding the point of that if youre just supplying power to the same two points as the battery. Wondering if there is something different between the 2012 and 2013. Also...what is the little white thing that you were careful to trim around at the battery? I ended up cutting my board off without that. I can easily attach it. But wanted to see what it is and make sure I need it. Is it a fuse? (EDIT: I see that it is both a temp protection circuit as well as over-current protection. Question is...do I really need it now?) Thanks! Justin
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bexus
New Member
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Post by bexus on Jul 9, 2017 15:21:47 GMT
Hi there, Thanks for all the info on this mod, I have done the battery delete and all seems fine, except I am having the same problem as Justin. I cannot get the tablet to go into Timur's Rom mode via OTG while connected to 12v. Again when I switched back to the battery it worked fine. Anyone have any ideas on why this might be? Thanks Graeme Hi Graeme, I never really heard of this problem before, are you using the 2013 or the 2012 N7, when you say not go into ROM mode what do you mean exactly ?
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bexus
New Member
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Post by bexus on Jul 9, 2017 15:31:26 GMT
Use a galvanically isolated dc-dc converter ( do no use cheap chinese converters) to power the battery pcb, i use "SD-15A-5" from Mean Well, that has a trimpot to lower the voltage down to 4.45v which by the way works great for me. Using a standard psu or usb car charger will give you ground loop and you will need another audio usb dac or audio isolator circuit to fix the high pitch noise. Common ground between the car (a very noisy powe source) and the nexus it's not a good ideea anyway! Nice mod .. love it when mods are modded and improved : for the 2012 model you don't connect the second ground wire , u only need the two wires going to the battery terminals , after connecting those two wires you will need a constant power soures for the cable you connected to the nexus 2012 edition . Now blug a second USB cable to the normal port of the nexus the the other end to any regular 5v port . At this time it should show that ur nexus is charging and that will act as a remote when I turn the car off and on , if u plug the USB cable and don't see the charge symbol u may have to consider getting a inverter
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