I'm taking a look at my coworker's Nexus 7 (non-3G model), and it's exhibiting some peculiar symptoms. The most obvious is that the power button was jammed - I popped off the back cover and took care of that. The button has an extremely soft touch now, but it seems to work fine.
It was also booting itself up in safe mode. I figured the jammed power button was causing some weird power cycling, and the filesystem had been corrupted in some way. No sweat, just flash the 4.4.4 factory image.
Still booting in safe mode every time. If I turn it on with power + volume down, I get the usual bootloader menu, and all three hardware buttons work for navigating the menu. Then I continue past the bootloader and get into Android, and it's in safe mode, and the volume down button doesn't seem to respond (though power and volume up work).
Rebooting the device with the ribbon cable for the power/volume buttons disconnected from the motherboard still lands it in safe mode. So I'm pretty sure it's not a stuck hardware button.
For good measure, I flashed TWRP, fully formatted all the partitions, and reflashed again. Same deal. Now I'm running out of ideas. Does the N7 have some kind of auxiliary volume button inputs somewhere that are jammed/shorted, and which the bootloader doesn't look at, but Android does? This is what I see in adb logcat:
Code:
I/WindowManager( 483): SAFE MODE ENABLED (menu=-1 s=-1 dpad=-1 trackball=-1)
I can upload the whole logcat somewhere if anybody is curious/bored enough to look at it. I couldn't find any interesting errors in it, though.
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Power button does not respond at any point.
*EDIT:except after battery out for a long time, then power button WILL turn the phone on, but then continues to not function as per usual.
However, the phone automatically turns on as soon as the battery is placed in, so it's not dead at least.
Also can not get the phone to be recognised on either of two computers (one running Win 7 and the other Vista) always get "device has malfunctioned etc"
Have re-flashed a ROM from SD but same problem. If holding down the Vol Down on start up (putting the battery in) I can get to bootloader, hence the re-flash. But holding down both gets to the hard reset 'warning' screen, but it won't let me press Vol Up to actually do the hard reset.
All in all a frustrating problem which means I have to remove my battery to turn my phone off and have to use the option from Windows Menu to lock the device.
Any help with any of the problems is greatly appreciated.
Also Power Button mechanical function is still normal.
Many thanks.
Sounds like your end key has become faulty as well as your volume up button. Both of witch are common issues, especially the end button, but most peoples volume down button wears out first. This is do to the fact that the end/power key is in constant use from turning on and off the HD2 or from getting MAGLDR to pulled up a bootup for those running NAND Android. Also the volume keys take a lot of wear and tear from constant volume adjustment especially if you listen to alot of music on your HD2. Plus the volume ..down key takes extra wear and tear from being used to enter bootloader.
hello
hello vsem
Yes it does seem that way, however I have had teh battery out over night, when I put it back in this morning it DID NOT automatically initiate the boot sequence. But it did after I pressed the power button, so it must have read it to some extent?
Also when the phone is on I can change the volume up and down as per usual, its all a bit strange.
Any other way to initiate a hard reset other than that menu?
Thanks very much!
It seems you are having a hardware issue, try sending your device to the service centre.
For some reason, when i reboot my phone (if it freezes and i do a battery pull), it only goes to hboot after that (engineering hboot). Along with that, in hboot, the power, and both volume keys are unresponsive. I tried removing battery, and sdcard and retrying, i only get to hboot.
The only way i can get out of hboot-loop is to run "fastboot reboot" from a computer (which wont be very convenient when i am not at home)
Does anyone know what could be causing this or how to get out of the loop without a computer? (i was at low battery when my phone froze and got into the h-boot loop..about 10%)
Thanks
EDIT: I somehow solved the problem by going through and pressing every button on the phone twice starting with power and going counter clockwise (power, power, volume up, volume up, volume down, volume down, home, home, menu, menu, trackpad, trackpad, back, back, genius, genius, camera, camera) I don't know how it worked but that's what I did
One of your buttons (VolDown most likely) was stuck and was causing this behavior.
Jack_R1 said:
One of your buttons (VolDown most likely) was stuck and was causing this behavior.
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Click to collapse
That's what I figured. But when I pressed volume down I could feel it click.. It might have been the actual trigger underneath the button.
Sent from my Glacier using XDA
I feel like this is a stupid question, but here we go anyway. I'm on an LS980 with TWRP 2.6.3.4.
I can boot into recovery just fine, as long as I use adb reboot recovery, or any of the methods to do a reboot to recovery from software. For the life of me, I can't get the volume down + power key combination to work. This would be no problem, except I'm stuck in a bootloop (my own fault), and can't get to either the software solution or ADB.
Yes, I've followed the directions in which you hold the two buttons, and when the LG logo appears, release and repress them both. I've done this about a million times now, in every different pattern and length of delay I can think of.
If I hold all 3 during boot, I get the "hardware control" screen, with a barcode and my IMEI at the bottom. Download mode, using volume up + plug in USB, works as well. Both volume keys have been functioning fine for controlling volume in software, so they are mechanically sound.
Is there any reason the keys might not work during boot? Is there any other way to reboot to recovery? My only idea is to push the stock image to the phone in download mode, and re-root, etc.
Thanks in advance!
Start with the phone powered all the way down (if you're bootlooping, hold the power button for maybe ~10s until there's a short buzz from the vibrator and the LG logo pops up, then hold it down for a few more seconds to power off).
Hold power+voldown until the LG logo appears. Release them then immediately push them again, and hold for a few seconds.
You'll get a 'Factory hard reset' screen that tells you to press Power to confirm you want to do a factory reset. Push Power a couple of times to confirm this. If you have a custom recovery installed, it won't erase anything, it'll just boot into recovery.
I just tried this, and it worked the first time.
Antinorm -
I'm familiar with that process, and have been trying it nonstop! Here's a video; maybe you could critique my technique?
You don't have to hold both buttons after the release.
1. Hold VolDn + Power until LG Logo appears.
2. Release both buttons for a few seconds
3. Hold only Power Btn
4. You get into Hard Reset
5. Push Power Btn 2 times (For executing reset)
After that the phone will boot into recovery.
Don't do this with plugged in USB cable I don't know why, but it doesn't work if you have a usb connection.
Nope, no luck using just the power button for the second press. Thank you, though! I'll write some more detail of what I see.
Initial state: the boot animation is looping.
I press and hold the power button.
The screen goes blank. I continue to hold the power button.
The LG logo reappears for a moment. If I were to release the power button before this point, the phone would restart.
I do not release the power button; I continue to hold it. The screen goes blank.
I now release the power button. This is the phone in its "off" state. If I plug it in to a power source, a battery charge icon and a percentage is displayed center-screen. Entering download mode from this state works. The phone is not plugged in.
I hold the power and VD buttons together. I've also tried pushing one first, then the other, in either combination.
The LG splash displays.
I release both buttons.
I wait an amount of time. I have tried various values from "as quick as I can move my fingers" to "a solid three-count".
I hold either both buttons (pressing them simultaneously), or just power, and wait.
Time passes.
GOTO 1
Does any of that sound wrong?
Weird. This method works for me. But getting into recovery was a bit of a hassle for me too at the beginning. Your doing seems to be ok... well seems like your only chance is adb right now.
Sent from my LG-D802 using XDA Premium 4 mobile app
Un4s said:
seems like your only chance is adb right now.
Click to expand...
Click to collapse
Do you know of any way to ADB without an OS booted or recovery? I don't!
IF your battery is low or almost gone - you can't enter in Recovery with those 2 buttons.
So just charge your battery. I'm using CWM 6.0.4.4 and phone charges battery in this mode. It's slowly, but at the end my battery was 100%.
Now I can go to Recovery with 2 button combo. No download mode for me, but I'll open a new topic for that.
roleohibachi said:
Do you know of any way to ADB without an OS booted or recovery? I don't!
Click to expand...
Click to collapse
Whelp, sorry. Would have thought you can adb while in download mode. Turns out you can't.
Well i don't have a better idea than you with going stock and start from the beginning.
Thought Id ask here before I give up.
Been having a problem with my nexus.
The power button started acting up recently.
I've tried replacement and also made sure the mechanical button works inside someone else's device and it works fine.
My problem is that the button seems to loop or not work at all. For instance the device wont boot (Gets stuck in a loop) unless I hold the power down until the boot has completed, then if I let go it will usually stay on.
But then the power button is unresponsive unless I hold it again which in turn puts it back into a loop. I can hold it down for 10 secs then release then I get power down option but if I select it it goes back into a loop.
Ive tried a recovery which hasn't fixed it and tried using computer to flash a new image but I cant unlock boot loader as when I manipulate the button on the screen where I have to accept. It then goes into a boot loop again causing the device to not unlock/relock.
Im pulling whatever hair I have left out here and am about to give up unless anyone else has any ideas? Its as though the power button either works but sticks on. Or doesn't work at all. depending if I've held it on for a while or not.
Many Thanks
After replacing the battery in my X11575, the power button seems to be broken now. After taking it to a local repair shop, I was told that some of the components were damaged while the battery was being installed. Though the power button is broken both volume buttons still seem to be functional. With the volume buttons still working, is there any way to turn on the phone while in recovery mode without a power button? Thanks
If you have a computer with fastboot set up this might get it. I'm not certain if this will work, but it is worth a try (works on some Snapdragon devices). Start with the computer booted up and a USB cable plugged into it. Hold vol down on the phone and plug in the USB cable. That might boot it into fastboot. If it works enter this command on the computer and it should reboot normally:
Code:
fastboot reboot
Yoshibrothers said:
After replacing the battery in my X11575, the power button seems to be broken now. After taking it to a local repair shop, I was told that some of the components were damaged while the battery was being installed. Though the power button is broken both volume buttons still seem to be functional. With the volume buttons still working, is there any way to turn on the phone while in recovery mode without a power button? Thanks
Click to expand...
Click to collapse
Yes. This happened to me with a Moto X 2nd Gen, with a broken power flex.
First you need to remove the back cover. Use the iFixit guide because it'll tell you where flex cables are located under the cover so you don't snag or break them.
Then you'll see a ZIF connector just under the flash. If you short the 1st and 4th pin, it will turn on. You can use a paperclip, staple, etc. If you can't get it to cut on, just keep trying. Those pins go to switches on the board, so you won't short out anything electrical by messing with it with the power off.
(Only short them for as long as you would push the power button down to turn the phone on. If you hold it for too long it'll boot into the bootloader, which actually would be fine now that I'm thinking about it, since you can reboot to system from there.)
Just make sure it's not plugged in when you are jumping the lines.
I included some pics I just took with a X Pure/Style I just replaced the display on and confirmed it's the same as the X 2nd Gen.
If you have issues, just hit me back.