I think I have fried my Nexus 7.... didn't even think about what I did how stupid am I....
I decided to wire up a Hella connector to a USB cable the idea being to plug it into my phone for charging on the road... I then had a not so smart idea to use my OTG cable to connect the USB A connector to my Nexus 7 to see if it worked...
Nexus 7 booted past the bootloader and then nothing.... I realised then how stupid I had just been...and still nothing...
Presumably I've run a shed load of power down one of the data line..... what a fool.....
ARGH!!!!!!! anything I can possibly do to salvage it.... please!! :crying::crying::crying:
you could try something ASUS support told me, press all buttons (volume + & -, power) for 30 seconds, and if it won't boot after that, you should get a RMA
chiwou said:
you could try something ASUS support told me, press all buttons (volume + & -, power) for 30 seconds, and if it won't boot after that, you should get a RMA
Click to expand...
Click to collapse
Going the RMA route would be costly. If it is dead, he'd be better off just bring a new N7.
Sent from my Nexus 7 using Tapatalk HD
Thanks for the suggestion but no it hasn't worked...
I've had the N7 plugged into the charger for the last 30 minutes or so and when I went back to it the screen backlight was on slightly (you can see if you look at the screen from the side)... but the whole unit was really really hot... I've obviously disconnected it but now can't get the thing to turn off, if I hold down the power button the screen flicks off but then back on.
:crying::crying::crying::crying:
najaboy said:
Going the RMA route would be costly. If it is dead, he'd be better off just bring a new N7.
Click to expand...
Click to collapse
I would think that "broken display” units on eBay/CL probably have working mobos and batteries, as the owners are trying to dump them because of the broken screen. But, buying used is a crap shoot.
Nice that Google is selling N7s at cost (or even a loss) - but it does mean that any oem component replacements will be a significant fraction of the original price.
I was reading in Play Books when my N7 shut down due to low battery. I plugged it in and it wouldn't charge or boot and I noticed a faint light bleed and faint dots streaming from right to left on the display. I tried things like holding the power button for 30 seconds to reset, holding vol down and power to try to get to recovery, but it wouldn't take. Finally, with it plugged in, I held down the power button for just about 10 seconds and backlight and dots stopped. A few seconds later without pressing anything, it booted up. It would start to charge, but if the screen timed out, I was back to the earlier state and it wouldn't come on. So I got it started again and immediately went to developer options and checked Stay Awake while plugged in. Eventually the charge built up and I'm back to normal, at least my N7 is normal. I only mention this because the OP talked about the faint backlight and it may be worth trying.
busterdan said:
Thanks for the suggestion but no it hasn't worked...
I've had the N7 plugged into the charger for the last 30 minutes or so and when I went back to it the screen backlight was on slightly (you can see if you look at the screen from the side)... but the whole unit was really really hot... I've obviously disconnected it but now can't get the thing to turn off, if I hold down the power button the screen flicks off but then back on.
:crying::crying::crying::crying:
Click to expand...
Click to collapse
A standard hella charger outputs 5V at 2A which is the same as your N7 original wall charger.
I doubt your problem came from the charger, it might be softbrick at an unfortunately moment.
I came across a similar problem when i was editing a custom kernel.
If you tried every method to shut down the device and failed do the following:
1. Open the case (it's quite easy to open with a plastic card)
http://www.ifixit.com/Guide/Installing+Nexus+7+Battery/9895/1
2. Unplug the battery and hold the power button 30 seconds (with the battery detached)
3. Let it soak for 10 minutes
4. Reconnect the battery and close the lid.
5. Put your nexus 7 in the wall charger, and you should see the battery bar on the screen.
After that, let it charge a few minutes and boot the device.
Related
New TF out of the box, charged (apparently), and it will not "turn on".
Note, this is a gift for my father, so my sister is in possession of the TF.
She charged it overnight and this morning, she pushed the power button ... nothing.
She went into a dark bathroom and could see the backlight on... nothing on the screen.
Went through the following:
1. Held power button down for 20 sec - nothing
2. Held volume down + power - nothing
Questions:
1. Is there supposed to be a light indicating that the TF is charging?
2. Is there a way to "reset" the TF?
3. Could the TF be in SLEEP?
4. The AC adapter ... is this 2 pieces? does the outlet portion separate from the cable portion?
5. Is this unit DOA?
S4F4M said:
New TF out of the box, charged (apparently), and it will not "turn on".
Note, this is a gift for my father, so my sister is in possession of the TF.
She charged it overnight and this morning, she pushed the power button ... nothing.
She went into a dark bathroom and could see the backlight on... nothing on the screen.
Went through the following:
1. Held power button down for 20 sec - nothing
2. Held volume down + power - nothing
Questions:
1. Is there supposed to be a light indicating that the TF is charging?
2. Is there a way to "reset" the TF?
3. Could the TF be in SLEEP?
4. The AC adapter ... is this 2 pieces? does the outlet portion separate from the cable portion?
5. Is this unit DOA?
Click to expand...
Click to collapse
Check that the 2 parts of the AC adapter are firmly pressed together. It sounds like it wasn`t charging.
ttav said:
Check that the 2 parts of the AC adapter are firmly pressed together. It sounds like it wasn`t charging.
Click to expand...
Click to collapse
She cannot separate the two parts. Is this supposed to separate easily?
Heard reports of damaged AC adapters. True?
S4F4M said:
She cannot separate the two parts. Is this supposed to separate easily?
Heard reports of damaged AC adapters. True?
Click to expand...
Click to collapse
Just tried to separate mine and couldn`t.There is a post about chargers but i`m afraid you will have to search for it. It was related to chargers not working i think (sorry i didn`t pay much attention as mine was fine)As far as i remember there are two different serial numbers for the charger. One was ok the other dodgy.
Sorry i can`t help more,
my tablet turns on as soon as I insert the charging cable... I don't need to press the power button
She tried a different USB charger, and no go. Still acted the same.
System did not boot...just a blank screen (visible in a dark room).
Sending it back to Amazon.
I have the same issue except that the backlight won't even turn on. Quite upsetting.
did you ever find a resolution?
Make sure you hold the power button for at least 8 seconds. If the battery is charged it should turn on. If it still doesnt you probably have a charging issue. (like a bad plugin trandformer). Try another power source. You can also hold down power and then plug in power cable and see if that wakes it up.
Sent from my SGH-T959 using XDA Premium App
singlebyte said:
Make sure you hold the power button for at least 8 seconds. If the battery is charged it should turn on. If it still doesnt you probably have a charging issue. (like a bad plugin trandformer). Try another power source. You can also hold down power and then plug in power cable and see if that wakes it up.
Sent from my SGH-T959 using XDA Premium App
Click to expand...
Click to collapse
So I've made a bit of a discovery that leads me to think the unit is defective.
When I use the method you mention I hear a clicking sound which I think I've correctly identified as the tablet turning off. Once I hold the button 2 more seconds, Windows recognizes the tablet and has installed the proper drivers so the tablet is on at least at some low level.
The screen however remains black even in a dark room (no backlight visible). I have looked but I cannot seem to find an Asus tech support number for this tablet. Also because I can not get the screen to turn on I can not activate debug mode so I cannot get into ADB.
Try Nvflash, should fix any brick. If Nvflash doesn't work it's pretty much a DOA for sure.
Hey got my transformer today but no joy, It wont even power on . I charged it via wall socket for an hour, still wont power on so I tried charging it through usb on my desktop and still no dice. I tried the button combinations listed here http://forum.xda-developers.com/showthread.php?t=1032374 and was able to get a reproducible click noise but no screen movement what so ever. I unplugged it once in the beginning and it made a low battery noise but have not been able to make that happen again. Any ideas?
Thanks
timinator94
P.S. Should I try this? http://tabletroms.com/forums/showthread.php?976-Nvflash-Unbricking-and-forever-root!
It couldn't hurt to try. It supposed to unbrick bricks.
Sent from my HTC Vision using XDA Premium App
Tried it. Windows does not recognize the device. Then clicking on properties it states that the device is not working. I'm guessing faulty cable. Will look for a replacement tonight.
As per the instructions charge it for 8 hours with the OEM charger and cable. Charging via the USB is pretty worthless. The charger is rated at 1.2 Amps at 15 volts. A USB port is .5 Amps at 5 volts, way less.
You need to install the Windows drivers to have ir recognized.
Sounds like a dead screen.
Does the power adapter feels hot/warm when you do your charging? Did you push in the power adapter until you hear a click sound?
@greeny2010 Yes and yes,
I will let it charge all night tonight and let you all know in the morning.
Ok I let it charge overnight and attempted to power it on. First I pressed the power button for ~10 seconds then waited ~5 seconds and pressed power again. This time the speakers made a pop noise and I heard the camera click but still no screen D:
Any other ideas? I really don't want to rma I have my final essay due Thursday and I stupidly sold my laptop to get this thinking it would get here and just work.
I read in another post where someone had a similar issue which was due to a bent pin where the transformer connects. I would inspect that carefully.
timinator94 said:
Ok I let it charge overnight and attempted to power it on. First I pressed the power button for ~10 seconds then waited ~5 seconds and pressed power again. This time the speakers made a pop noise and I heard the camera click but still no screen D:
Any other ideas? I really don't want to rma I have my final essay due Thursday and I stupidly sold my laptop to get this thinking it would get here and just work.
Click to expand...
Click to collapse
do you have a mini hdmi? IF so see if you get a picture on your tv. I was able to get a picture on my tv but not on my TF. Turned out my display was dead.
Dead screen The backlight is out. Is there any fixing this or is rma the only option?
sux, RMA it yo
timinator94 said:
Dead screen The backlight is out. Is there any fixing this or is rma the only option?
Click to expand...
Click to collapse
Within 30 days you can always return it, if you can find another one in stock somewhere. Otherwise RMA is your only option
bricked transformer
i have asus tranfrormer 9.x.x.x, recovery 5.8.x.x, after i did superwipe , every thing is gone and i cant flash any rom through adb/nvflash saying cant write to sdcard (read only). any suggestions?
Today I picked up may Nexus 7 and noticed it will not turn on. I let it charge for an hour or so, but then when I tried to start it up, I saw just a black screen. The screen turns on (backlight turns on), but still just a black screen. I read something on the internet about pressing the power button for a full 30 seconds, so I tried that. This time, I got it to flash (for a fraction of a second) the word "Google", and then it was back to the black screen of nothing.
I've never rooted, never tried to do anything fancy with it. I've factory resetted it once after an update to the OS happened.
Is there anything I can do?
You sure it gets juice? Does your charger feel hot after charging some time?
I had this to once, but got it fixed by holding the power button...
Sent from my Nexus 7 using xda premium
Sounds like a charging /battery issue if the 30 sec power didnt work.Did you try a different charger?
Some people have reported weird issues like this that have been rectified by a prolonged charging.
Thanks
It acted strange, but it came back from the dead:
It said "google" for 10 seconds, then a few seconds of black screen, then another 10 seconds of "google", then it booted just enough to tell me that it was going to shut down because of low battery. I let it charge another hour and then it was fine!
eddified said:
It acted strange, but it came back from the dead:
It said "google" for 10 seconds, then a few seconds of black screen, then another 10 seconds of "google", then it booted just enough to tell me that it was going to shut down because of low battery. I let it charge another hour and then it was fine!
Click to expand...
Click to collapse
Quirky little buggers aren't they? Mine did it once and not since.
I just goy my N7 today, plugged in the wall charger, and I'm stuck at black screen, I did the 30 secs hold power button but it's still and black screen. Also I tried this:
1. Plug-in your dead N7 to a wall charger. (Jump immediately to step 2.)
2. Immediately after plugging it in, press Volume Down and Power at the same time.
3. Once in the bootloader menu, use Volume Down until you see “Power Off Device.”
4. Choose that option with the Power button.
5. Once your device is off, unplug the charger and then plug it back into the device.
Still at black screen, any advice???
I'm sorry for posting in this old thread.
Jamiehefe said:
I just goy my N7 today, plugged in the wall charger, and I'm stuck at black screen, I did the 30 secs hold power button but it's still and black screen. Also I tried this:
1. Plug-in your dead N7 to a wall charger. (Jump immediately to step 2.)
2. Immediately after plugging it in, press Volume Down and Power at the same time.
3. Once in the bootloader menu, use Volume Down until you see “Power Off Device.”
4. Choose that option with the Power button.
5. Once your device is off, unplug the charger and then plug it back into the device.
Still at black screen, any advice???
I'm sorry for posting in this old thread.
Click to expand...
Click to collapse
I just solved this, I opened my N7 to check the battery and it turns out it wasn't correctly connected... Just unplugged it and plug in again correctly to make it work!
Jamiehefe said:
I just solved this, I opened my N7 to check the battery and it turns out it wasn't correctly connected... Just unplugged it and plug in again correctly to make it work!
Click to expand...
Click to collapse
Boom!
I was having the same problem. Plugged it into a power source, backlight would come on with a black screen. Got it to show the Google splash screen a few times, but it just wouldn't boot. Tried ADB, but it wouldn't even acknowledge the thing was connected to the PC. I tried a pile of stuffs. Then I read this post. I never thought to check if the thing was actually connected, it wasn't!
Fully functional device now. Thanks for the idea! :good:
Pretty self explanatory. It was dead for a couple of days, I put it on the charger for almost the whole day, now I get no picture, but the backlight is on when I hold the power down a minute. I bought it at walmart, doubt I have the receipt, and didn't get any extended warranty. Is there a way to fix this issue?
I've got the same issue. I was playing Tupsu, when suddenly my n7 rebooted and there was no picture, just semi-strong backlight. When the tablet died, the battery was about 45-50% and I was charging it through notebook's usb port (original n7 cable). I tried to turn it off, but pressing and holding the power button only made it reboot once again (i assume it was rebooting, since the backlight was turning off and on in a second). I've tried it many times, with tablet plugged into wall/usb charger, and even with the power+volume up/down combination, it would still behave the same way. However sometimes after rebooting there was not only backlight, but also thin, mostly white, horizontal lines, appearing in random places of the screen (appearing and disappearing after like 50-100 ms). It would stop only after a reboot, and happened every 5-10 reboots.
I've decided to let the battery die to see if it changes something, and as you may guess - it didn't. It died estimately after 2 or 3 hours. Now it's all the same, except for when I plug it to the charger, there's only a very low backlight (still no picture) and it's blinking... It also makes this continuous "electricity-related" (sorry, I don't know what's the word to call it ) sound. After I press the power on, or let it charge for 1-2 minutes it boots up, and there's just a semi-strong backlight, like earlier.
It's a refurbished 8gb n7, which I got 5 days ago from the polish Asus online store. Oh, and the speakers weren't 100% fine, if it changes something. They were fine at first, but after i plugged headphones in and out, they were making cracking sounds when the volume was over 50% or something like that. Is there any hope I can fix it myself?
edit: the android ver. is 4.2.2, not rooted
the device is getting warm on the left side when being charged, or just turned on...
Have you tried pulling the battery for a couple of minutes?
Sent from my Nexus 7 using Tapatalk HD
Nope, i don't want to mess with the hardware since i've bought it only few days ago... I'm afraid it may leave some traces of being opened, i'm not willing to take the risk.
You won't leave a trace pulling the battery. Just use a guitar pick or credit card and run it round, the back comes off very easily.
Sent from my GT-I9000 using Tapatalk 2
Yeah that is definitely worth a shot. Just pull the battery.
Ok, I did it.
Didn't change a thing >:[
btw. I didn't actually pulled off the battery, i've just disconnected it - it doesn't make a difference, does it? and another thing - the backlight was turning on immediately after connecting the battery... with these randomly popping horizontal lines.
I've got this too!
wujekandrzej said:
Ok, I did it.
Didn't change a thing >:[
btw. I didn't actually pulled off the battery, i've just disconnected it - it doesn't make a difference, does it? and another thing - the backlight was turning on immediately after connecting the battery... with these randomly popping horizontal lines.
Click to expand...
Click to collapse
I've got this too! Pulling the battery does nothing. Last time it just fixed itself, now nothing.
Worried I'll have to take mine back.
How did that 'fixing itself' happened to you if i may ask? And how long did it last?
Your tablet has gone into sleep mode to protect the battery from further damage due to its low level of charge. What you're seeing is by design, as complete discharge of a lithium based battery is bad for it. You should never, ever, let it sit dead for a couple days. If you do discharge it to the point of shutdown again, immediately put some sort of charge on it, as waiting to long will cause the battery's protection circuit to fail completely. Best practice is to not let your device go to the point of shutdown, but rather to plug it in when not in use. Your battery will have a longer lifespan.
Plug your N7 into the charger and immediately press power and volume down to get into the bootloader. Once there, use the volume key to scroll to Power Off Device and then press the power button. After it powers off, unplug it and then plug it back in. It should then charge normally.
You seem not to have read my posts at all. When it happened, the battery was about 45-50% and it was plugged into the laptop's usb port. It suddenly rebooted and there was no more picture, just the backlight - and it lasted for like 2-3 hours (maybe even longer)! Can a completely discharged battery power the backlight for this long? After it turned off at last, i put it on charge and i've tried the power+volume method and it didn't do anything (btw. i already wrote about it)... then i let it charge for like 5-6 hours and it didn't change anything except for the fact, that the battery was evidently charged, because the backlight again lasted for few hours.
wujekandrzej said:
You seem not to have read my posts at all. When it happened, the battery was about 45-50% and it was plugged into the laptop's usb port. It suddenly rebooted and there was no more picture, just the backlight - and it lasted for like 2-3 hours (maybe even longer)! Can a completely discharged battery power the backlight for this long? After it turned off at last, i put it on charge and i've tried the power+volume method and it didn't do anything (btw. i already wrote about it)... then i let it charge for like 5-6 hours and it didn't change anything except for the fact, that the battery was evidently charged, because the backlight again lasted for few hours.
Click to expand...
Click to collapse
Actually, I was addressing the OP without realizing that this was a zombie thread.
To answer your question though... yes, when in sleep mode the battery can still turn on the backlight and keep it powered for some time due to the low power requirement of a black screen. Many users that have found themselves in sleep mode actually have their tablets enter into a prolonged cycle of bootloops. From the sounds of it, your device seems to have, for reasons unknown, put itself to sleep.
Anyway, I digress... I know you've stated you've tried various combinations of the power and volume keys. Have you attempted holding all three buttons for approximately 30-40 seconds while the tablet is plugged in? If it that will force it into the bootloader, you can follow the steps that I posted to get it up and running again. If not, then it seems your best available option is to seek an RMA from ASUS. Given your speaker issue, I'd send it back regardless- you shouldn't be expected to deal with battery and speaker issues after only five days.
najaboy said:
Actually, I was addressing the OP without realizing that this was a zombie thread.
Click to expand...
Click to collapse
Ok, then i'm sorry for few harsh words
najaboy said:
Anyway, I digress... I know you've stated you've tried various combinations of the power and volume keys. Have you attempted holding all three buttons for approximately 30-40 seconds while the tablet is plugged in?
Click to expand...
Click to collapse
Yep. Many times. And even longer than a minute.
Anyway, I'm going to contact their crappy support. Thanks everyone for trying to help.
I was on my computer when i remembered i has something written in my tablet's notes that was important. I took it out of my bag and noticed it wouldn't turn on, it was out of battery (hadn't touched it for about a week). I just plugged it in the proper asus charger and put it down and went straight back on my computer.
I decide to check on it after 2 hours thinking it would be near or fully charged. I pick it up and noticed it was on a blank back lit screen. I unplugged it and then the screen turned straight off. Wondering if it didn't charge at all i re-plugged it in. There was no google logo (rooted), instead it turn on with a lit black screen and off and repeating a few times and then small thin artifact pixels run across the screen (red, blue and yellowy colours) and then stay at a black lit screen like when i first picked it up. I had just noticed a small buzzing sound while this was happening and still does so when stuck at the screen. I'm pretty sure it was buzzing when i had found it.
I redid what i had done (unplug, replug) and watch to see if it did the same thing. It did. I tried to power it off while it was at the black screen and it did, but then it would turn back on and etc. Same if i tried to enter boot loader or any key combinations.
I've tried disconnecting the battery and reconnecting and same effect (tried it without battery attached also)
I have a feeling it is dead now and i have no other ideas (checked many forums but got nothing).
Any help would be appreciated.
yvgamer94 said:
I have a feeling it is dead now and i have no other ideas (checked many forums but got nothing).
Any help would be appreciated.
Click to expand...
Click to collapse
It's surely hardware failure, have take some humidity or something like that?
Try press power for 60 seconds, if you wont see any Google logo there's some hardware failure you need to RMA ( http://en.wikipedia.org/wiki/Return_merchandise_authorization )
found the fix
I found away to fix my nexus 7. You could be right how it might have a minor hardware fault, live in australia in the high hot tropics (high humidity). I decide just to plug it into my computer usb charger instead of the proper charger since it had a lower max amp output. Against my ear, a much fainter buzzing is still heard but this time, there was nothing. No power, no back lit black screen, just a very faint buzzing. Decided to let it sit just to see what happens. After an hour or so, i decided to press the power button and noticed there was a battery charging signal. To my delight, I'm sure it was in working order now so i powered it on and oh how relieved i was.
I determined that my device might have had a small hardware fault that made it draw to much power from the 2 amp original charger and thus why the tablet could not boot up properly (from battery depletion). Either that or my charger could be bugged to. But the thing is, since it charged to slow from the usb, i plugged in the proper charger and it worked fine. Just have to try not deplete my battery i guess.
Thanks.