Dash install not charging - Nexus 7 Q&A, Help & Troubleshooting

Mounted my n7 in dash, got it hooked up to power and speakers. Using timurs ROM. All works well, says its "usb host fast charging" but looses charge all the time. Battery level permanently drops. Ive tried various chargers and bo difference. Is it possible the battery is dying?
Thanks

I don't know why, but I had the same problem, also with 2.1A 12v/USB converter.
I found that if I only use the OTG cable it did charging fine but if I used a usb extension cable in addition the battery charged out.
idk why, have tested several extension cables

Probably voltage droop from a poor charger and/or poor cable. The Nexus 7 is very sensitive to it and it'll randomly only do slow charging otherwise.

Hi im from Italy so sorry for My English.. That My experience with n7 in Car installation
When i drive for more 4hours (with 3g bt and GPS all on and display obviously on) i usually lost about 3%.
The problems starts When tablet start To freeze and boot alone then i lost more battery (maybe with a clean installation i ll resolve that issue or maybe is caused by Hot temperature of battery.) anyway a otg-y cable is suggest, for a better charge (i mean not a otg simple cable But a otg-y).
Inviato dal mio Nexus 7 utilizzando Tapatalk

Related

[Q] N7 Discharging even while connected to charger! Help!

Hello community.
I am experiencing this problem since around three weeks. My Nexus 7 won't charge with full speed, I even think it is only charging with lower than the half of the rated 2 amps of the stock charger, or even less. As you can see in the attached screenshot, it behaves like it is receiving zero to none power, but the status sais it is in fact charging... I am using CoolTool to monitor the charge rate. While the screen is on and my tablet is just sitting there idle, it is "charging" with about -50mA (slowly discharging) and while watching youtube videos, it discharges with about 450mA. While the screen is off, it actually charges with arond 400mA MAX. While I was typing this it discharged with around 300mA.
I have not checked the resistance of the stock charger nor the cable, and I have yet to try making myself another fastcharge cable.
I am using the stock charger with the stock charging cable, and I recently upgraded to the latest SlimRom and FauxKernel.
Is this some kind of software failure or is my tablet/charger/cable broken?
Is someone experiencing similar problems?
(I have problems uploading pictures, google drive must be sufficient)
https://docs.google.com/file/d/0B3NjKaD9eYHeUFg3RVhEdk4xNTQ/edit?usp=docslist_api
https://docs.google.com/file/d/0B3NjKaD9eYHeVnh6ZGswVGNpS1E/edit?usp=docslist_api
All i can think of is ur using low amp charger try using official 2.1amp charger that came with the device.
Please ignore my spelling mistakes. English is not my native language.

[Q] Nexus 7 in car

Hi, I have recently installed my Nexus 7 (running CM10.2 on 4.3.1 and leanKernel) in the dashboard of my car. I installed a cigarette socket behind that dash that provides power to the device when the vehicle is running. When the vehicle turns on i have tasker set to lock the display on, start my music and torque. The problem I am having is when the N7 is one and receiving a charge the battery is still discharging (approx. .8%/h according to battery stats app). I have used 3 different charges, two which are 2.1A and the third is 150w dc 12v to 110v ac power inverter which i have used 2 different usb chargers in, but i am still seeing the battery discharge while I am using the tablet. i can rewire the cigarette socket so it is constantly charging the device but since I am not able to reach the power button on the tablet i dont know how ill be able to toggle the screen. i have tried to under-clock the cpu and gpu (currently have the device running on 1 core) but still havent seen an improvement. Any idea what i may be able to do to rectify the problem?
I was also going to try to upgrade the tablet to 4.4.2 but adb and fastboot cannot see the tablet anymore. i updated the usb drives and it was working perfectly fine up until a week ago so i am not sure what is happening.
Thanks for the help.
Ted_rivers said:
Hi, I have recently installed my Nexus 7 (running CM10.2 on 4.3.1 and leanKernel) in the dashboard of my car. I installed a cigarette socket behind that dash that provides power to the device when the vehicle is running. When the vehicle turns on i have tasker set to lock the display on, start my music and torque. The problem I am having is when the N7 is one and receiving a charge the battery is still discharging (approx. .8%/h according to battery stats app). I have used 3 different charges, two which are 2.1A and the third is 150w dc 12v to 110v ac power inverter which i have used 2 different usb chargers in, but i am still seeing the battery discharge while I am using the tablet. i can rewire the cigarette socket so it is constantly charging the device but since I am not able to reach the power button on the tablet i dont know how ill be able to toggle the screen. i have tried to under-clock the cpu and gpu (currently have the device running on 1 core) but still havent seen an improvement. Any idea what i may be able to do to rectify the problem?
I was also going to try to upgrade the tablet to 4.4.2 but adb and fastboot cannot see the tablet anymore. i updated the usb drives and it was working perfectly fine up until a week ago so i am not sure what is happening.
Thanks for the help.
Click to expand...
Click to collapse
Hi, do you have a dcdc-usb? I know Who did your work (n7 in dash car) normaly have that, with a otg-y cable and normaly use USB ROM with Timur's kernel, which is a dedicated rom for car 's installation. Try to search info about that.
Unfortunatelly development is stopped to android 4.2 (the release before 4.3) But it' s very good rom.
If your installation is fixed, in the night u will lost about 1-2 %
Ps can you upload some photoes about your dash ?
Inviato dal mio Nexus 7 utilizzando Tapatalk
furious84 said:
Hi, do you have a dcdc-usb? I know Who did your work (n7 in dash car) normaly have that, with a otg-y cable and normaly use USB ROM with Timur's kernel, which is a dedicated rom for car 's installation. Try to search info about that.
Unfortunatelly development is stopped to android 4.2 (the release before 4.3) But it' s very good rom.
If your installation is fixed, in the night u will lost about 1-2 %
Ps can you upload some photoes about your dash ?
Inviato dal mio Nexus 7 utilizzando Tapatalk
Click to expand...
Click to collapse
I dont have a dcdc-usb as the power to the tablet is coming from 2.1A car charger or a 150w power inverter. i dont have a otg-y cable but i do have the means to easily install one if i ever need it. I never knew about USB rom and Timur's kernel. ill flash those asap and hopefully that will fix the battery drain. As for pictures i only have this one from when i first installed the the tablet but know i have my dashboard disassembled. hopefully this will hold you over for now .
Uhm i can say to u try the USB ROM,i haven't other idea
Ps nice work
Inviato dal mio Nexus 7 utilizzando Tapatalk
Ted, you need to flash a kernel that supports fast charge and enable it. I have the same issue, after flashing a 4.4 rom I lost my fast charge and over the duration of a long drive the battery is discharged. Apps such as fanco kernel updater have the option to enable fastcharge, if the kernel supports it. Great setup BTW, I have mine mounted on the dash.
ryar said:
Ted, you need to flash a kernel that supports fast charge and enable it. I have the same issue, after flashing a 4.4 rom I lost my fast charge and over the duration of a long drive the battery is discharged. Apps such as fanco kernel updater have the option to enable fastcharge, if the kernel supports it. Great setup BTW, I have mine mounted on the dash.
Click to expand...
Click to collapse
Hi ryar,
Thanks for the help. I've flashed a few different kernels that have fast charging enabled. The latest is Timur's kernel which says fast charging is enabled. Sadly my tablet is still discharging when its in use so I've decided I'm going to have it set to charge at all time and use a magnet to switch the screen on when I need it.
Ted_rivers said:
Hi ryar,
Thanks for the help. I've flashed a few different kernels that have fast charging enabled. The latest is Timur's kernel which says fast charging is enabled. Sadly my tablet is still discharging when its in use so I've decided I'm going to have it set to charge at all time and use a magnet to switch the screen on when I need it.
Click to expand...
Click to collapse
Are you trying to charge in host mode or just using the USB came that came with the nexus 7? I could help you solder power and volume to some switches so you can toggle screen on off that way? I bought a Samsung branded car charger and it works great for car charging. I made a y cable that you can turn host mode on and off with a switch. I could help talk you through it or do it for u if you buy the stuff its pretty cheap fairly simple to do if u have patients. Most of Those 2.1 amp dual port chargers only supply 1 amp to android devices, this could be your problem.
b3ltazar said:
Are you trying to charge in host mode or just using the USB came that came with the nexus 7? I could help you solder power and volume to some switches so you can toggle screen on off that way? I bought a Samsung branded car charger and it works great for car charging. I made a y cable that you can turn host mode on and off with a switch. I could help talk you through it or do it for u if you buy the stuff its pretty cheap fairly simple to do if u have patients. Most of Those 2.1 amp dual port chargers only supply 1 amp to android devices, this could be your problem.
Click to expand...
Click to collapse
I am just charging the tablet straight up no host mode. ive used a variety of chargers: two different branded 2.1a chargers and both the stock nexus 7 wall charger and another tablet wall charger plugged into a 150w power inverter. Thank you for the offers! If its fairly simple to solder the power switch I would prefer to do that regardless of the discharging problem so that i can hard reset the tablet if i ever need to.
Thank you for the help!
Ted_rivers said:
Hi ryar,
Thanks for the help. I've flashed a few different kernels that have fast charging enabled. The latest is Timur's kernel which says fast charging is enabled. Sadly my tablet is still discharging when its in use so I've decided I'm going to have it set to charge at all time and use a magnet to switch the screen on when I need it.
Click to expand...
Click to collapse
Fast charging on Timur's rom work with otg Y Cable
Inviato dal mio Nexus 7 utilizzando Tapatalk
Ted_rivers said:
The problem I am having is when the N7 is one and receiving a charge the battery is still discharging (approx. .8%/h according to battery stats app). I have used 3 different charges, two which are 2.1A and the third is 150w dc 12v to 110v ac power inverter which i have used 2 different usb chargers in, but i am still seeing the battery discharge...
Click to expand...
Click to collapse
I've had my Nexus 7 "in my truck since last year. I at first had it sleep via Tasker, but I was having issues if I left my car for awhile. The batterywwould be low and if I didn't have long drives, I could never rechargeit to ssufficient battery fullness.
I changed my setup to have the tablet power on upon receiving AC ignitionpower using this adb command:
there is a Fastboot command that you can issue to the bootloader to make the tablet power on once plugged it.* “fastboot oem off-mode-charge 0” makes the unit power on the instant its connected to AC. “fastboot oem off-mode-charge 1” returns to normal state,* so fitting an external switch isn’t 100% necessary, but i decided i wanted one anyway. I’m using Tasker to switch the unit on and off* with the ignition, but having the external switch is a handy addition.
Click to expand...
Click to collapse
Then I have Tasker turn it off after minute not being used. I'm sure it's not good for the Nexus 7 to always be at 100% power, but I don't care about the batter health because I purchased this for my truck only.
My only concern now, is the safety of the battery in AZ summer heat. I don'twant it to explode, and iI'm wondering if the tablet will function with AC power only, then I could remove the battery and not worry about it.
Poi25 said:
I've had my Nexus 7 "in my truck since last year. I at first had it sleep via Tasker, but I was having issues if I left my car for awhile. The batterywwould be low and if I didn't have long drives, I could never rechargeit to ssufficient battery fullness.
I changed my setup to have the tablet power on upon receiving AC ignitionpower using this adb command:
Then I have Tasker turn it off after minute not being used. I'm sure it's not good for the Nexus 7 to always be at 100% power, but I don't care about the batter health because I purchased this for my truck only.
My only concern now, is the safety of the battery in AZ summer heat. I don'twant it to explode, and iI'm wondering if the tablet will function with AC power only, then I could remove the battery and not worry about it.
Click to expand...
Click to collapse
How are about temperature there? How is your setup into truck? I mean n7 is into the Dash? Or You have some support? Anyway maybe your technical questions will be better answering on developer forum (If You have installed usb rom by timur)
Inviato dal mio Nexus 7 utilizzando Tapatalk
furious84 said:
How are about temperature there? How is your setup into truck? I mean n7 is into the Dash? Or You have some support? Anyway maybe your technical questions will be better answering on developer forum (If You have installed usb rom by timur)
Inviato dal mio Nexus 7 utilizzando Tapatalk
Click to expand...
Click to collapse
The temperature gets to almost 120F (48.8C) in the summer, and that's outside the vehicle. I took a dremel to my dash and modified it to mount the nexus 7. It's clean and looks just about stock. I made a wooden box to the dimensions of double DIN, and put the mounting brackets on either side. I used sticky tape to mount a nexus 7 matte black case to the front of the box, so when I slide the box into the double din area it lines it up perfectly. Then I just snapped the dash back into place over the top of the Nexus 7. So, the tablet is basically built into my truck.
Poi25 said:
The temperature gets to almost 120F (48.8C) in the summer, and that's outside the vehicle. I took a dremel to my dash and modified it to mount the nexus 7. It's clean and looks just about stock. I made a wooden box to the dimensions of double DIN, and put the mounting brackets on either side. I used sticky tape to mount a nexus 7 matte black case to the front of the box, so when I slide the box into the double din area it lines it up perfectly. Then I just snapped the dash back into place over the top of the Nexus 7. So, the tablet is basically built into my truck.
Click to expand...
Click to collapse
I saw photoes after i posted .
48C wow.... In italy it s hard when there are 35...
Inviato dal mio Nexus 7 utilizzando Tapatalk

[Q] Battery drains when plugged in

I have a nexus 7 1st generation, the battery drains when it is plugged in so it doesnt charge, however, it does charge when turned off.
I have tried two different wires, I charge using the wall socket.
I have tried using different sockets but I still experience the same problem.
I haven't rooted it or anything
I've been on trouble shooting forums etc and have installed battery moinot widget, its says Status: discharging AC plugged in
Health: good
Temperature: 27°C
Voltage:3907
Capacity: 2854/4325
Battery flow: -612mA ( -14.15%/hr)
I know people usually ask if there are any apps using a lot of battery but right now 77%= screen, 4%= android system, the other is used up by other apps it only using about 2% each
I dont understand what it is because if it was something to do with the connection it wouldnt charge when off, but it does, just not when turned on
Would any factory reset help?
Any advice????
Mine has done that sporadically. With USB and dock. Usually a reconnect will get the current flowing. There's a thread here somewhere suggesting charging on the 500ma computer usb connecting and reconnecting a few times. I think it's the USB daughter board.
Sent from my Le Pan TC1020 using Tapatalk
OK, can't find original thread. I suspect the battery is too hot and the charge delayed. Then once in deep sleep it never starts the charge. I'm going to set WiFi on while charging, hopeful a sync will wake it to resume charge.
sent by mirrorflash Morse code
claire13524 said:
I have a nexus 7 1st generation, the battery drains when it is plugged in so it doesnt charge, however, it does charge when turned off.
I have tried two different wires, I charge using the wall socket.
I have tried using different sockets but I still experience the same problem.
I haven't rooted it or anything
I've been on trouble shooting forums etc and have installed battery moinot widget, its says Status: discharging AC plugged in
Health: good
Temperature: 27°C
Voltage:3907
Capacity: 2854/4325
Battery flow: -612mA ( -14.15%/hr)
I know people usually ask if there are any apps using a lot of battery but right now 77%= screen, 4%= android system, the other is used up by other apps it only using about 2% each
I dont understand what it is because if it was something to do with the connection it wouldnt charge when off, but it does, just not when turned on
Would any factory reset help?
Any advice????
Click to expand...
Click to collapse
I had the same problem with mine. However, for some reason when i used an HTC charger (with the usb to AC adapter) it was charging faster than losing charge. Once i changed chargers to one with a shorter but thicker cable, i never had the problem again, even with the brightness all the way up.
Hope this helps.
thats the same problem that i got when i first got my nexus 7
what fix it was a different charger and cable

Charging issue?! Please help

I have a Nexus 7 2012 tablet (with CM12).
It worked for a few years but I have a kind of charging problem.
I plugged up to charger and for one sec it charges than for one sec it don't. I left it for hours but it only drained the battery and discharged.
I thought that the usb connector was damaged so I replaced it, and I also replaced the battery because it was in bad condition.
Now I still has the same charging-not charging problem. (I tried the new battery with the old usb and the old battery with the new usb and still have the problem)
Any idea what to do?
NOTE: I plugged in an OTG pendrive and it worked fine.
It only has problem with charging.
It's a known issue with Nexus 7 (2012) devices. You need to find a good cable, good charger and probably need to plug in / plg out the charger several times. Sometimes it may help, too, to clean the connector.

My stock charger discharges the phone

Hello,
I just got my lg g6 and when i charge up the phone with the stock charger i encounter an issue.
The phone recognize the quick charge and all but instead of charging up the battery lose percentages and never really charge up.
The cable is correctly inserted both to the charger and to the phone, if i use a non quick charge charger everything works fine so the cable shouldn't be the issue.
In addition, the phone from time to time behaves like the charging disconnects and reconnects. The screen turns on and i see the message "charging" which immediately turn to "quick charging" like if i just inserted the cable, but the battery keeps being drained or just stays at the same %.
I also noticed a very strange battery graph. i'd post a picture but i can't upload images or put links at the moment.
in the time period that it was charging with the stock charger the graph presents a series of blank colums that interrupts the graph and the segmented line is trending downward.
I thought that maybe could be a faulty charger, but i tried it on other phones ( htc one and a lg g3 non qc capable) and it charges them totally fine. So now i really have no idea what could be wrong.
I have stock firmware, no root and locked bootloader.
Any ideas?
Download ampere from play store and see if it really charge
Inviato dal mio LG-H870 utilizzando Tapatalk
I already checked and it shows as charging.
The speed is turbo as well.
Ampere shows a charging value goes from 40mA to peaks of 1200-1300mA (very rare and immediately drop afterward)
I just tested and did a 30 minute charge session, it started at 54% and finished at 53%...
Monday arrives a new quick charge 3.0 charger. If that works i guess i'll blame the stock charger. Otherwise i could think of replacing the phone...
Most of the time this is due to the USB type C connector (both ends) getting dirty/dusty. I just dusted it out with compressed air and it worked fine again. A friend with a Aalaxy A5 (2017) also had this exact problem. Give that a shot and let us know.
I had a spare can of compressed air. Dusted both the usb-c on the cable and the phone and the standard usb male and female on the cable and charger. Waited for any condensation to go away, plugged it in and charged for another 10 minutes but still nothing.
The phone and charger are 4 days old and i bought them from amazon so no egdy e bay sellers. I find it hard i could be something like dust or anything. Anyway now all connectors are squeaky clean but the problem persists.
Frequent disconnections ( i get the bottom text "current connected" even if the cable is still in ) and the battery refuses to go up even 1%.
The strangest thing is that on normal charge with my old g3 it works fine, could it be that quick charge and normal charge are on different circuits? Maybe just the QC one is faulty.
Or even some component manages it with the standard 5v current but when it ramps up to 9 with the QC it gives up.
Sadly i know too little of this stuff to actually come up with a plausible explanation
I would return it as doa.
Ughh i'm gonna wait tomorrow and test with another charger.
I would really hate having to set the whole phone up again from scratch...
If by any chance you have to replace the G6, make a backup with LG Back up on you SD card. When you get the new phone you restore the backup and you 95% done.
Sent from my LG-H870 using Tapatalk
The charger arrived and everything works now.
I was just unlucky thay i got a faulty stock charger.
Might do some test with the cable as well just to check if it works properly.
Thank you for all the replies!

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