Database Users

Nexus 7 random reboot, screen jamming, making noise

HELP,
yesterday, I was using my nexus 7 for normal use, wasn't playing game, just browsing with chrome. the battery was 8 percent when I last saw it. I then proceed to charge it, but the thing suddenly just shut down itself. I thought I misread the battery percentage, so I charge it anyway. about an hour later, i checked on my nexus 7, turn it on, got to the boot screen, got to the home screen, use it for about 15 minutes, and suddenly, the screen black out, it was flickering like crazy, and making some white noise ish sound. I panicked so I hold down the power button and turn it off. I turn it on again, and after about 30 seconds, the same thing happened again. I was using motley's kernel with 520 GPU, and I thought, maybe my nexus 7 cant handle the GPU OC. So I went to recovery, tried playing with recovery for about a minute or so, but the screen didn't flicker at all on the recovery. So I flashed the 484 GPU version of motley's kernel. When I reboot to system, the same thing happened again. So I thought, maybe if I restore to my old backup, it would not be like this any more. so I wipe the data, dalvik, and cache, and I restore my old backup. But the same thing happened again, only this time, after I turn it off, it make a high pitched sound.
I waited for about 6 hours, and now when I turn my nexus 7 on again, it works normally.
So, what has happened to my nexus 7?

bump

I'd say it is the overclock. Graphic cards do some weird stuff when overclocked. You can burn up your GPU doing that and cause it to forever freak out. I always shied away from GPU overclocks.
Sent from my Nexus 7 using xda premium

would that cause any permanent damage?

keni.mardira said:
would that cause any permanent damage?
Click to expand...
Click to collapse
It should be ok if you reflash back to stock rom to make all the hardware back to reset mode. A warning always given when we try to flash rom with oc created.

i also experienced this one, also received a battery warning and then suddenly screen went blank. then same weird thing happened as the one above. I'm on paranoid android rom and i'm quite sure it's not overclocked or something. Was only able to get back to normal by holding the power button for around 15-20 seconds...

Happens to me
This will happen to me a lot when my nexus 7s battery dies, I plug the tablet in and then immediately try to start it up. It will work for around 30 seconds then look like an old TV without a signal. I am on stock everything, no rooting or custom Roms (yet). I always thought it had something to do with battery calibration being off and the tablet not having enough power to run, because it always works fine when I charge it before attempting to boot.
I have also noticed that every once in a while the screen will have a vertical line of pixels flicker.

Same thing happened to me yesterday...
I got the "low battery" warning and after some time the screen started flickering in many colors and there was a weird static noise.
I pushed the on/off button, but it wouldn't turn on again. After a few minutes of charging, I could turn it on again.
This isn't normal behaviour, is it? Shouldn't the N7 perform a regular shut-down when the battery has no juice left?
I'm on the rooted stock rom btw.

androidswagz said:
This will happen to me a lot when my nexus 7s battery dies, I plug the tablet in and then immediately try to start it up. It will work for around 30 seconds then look like an old TV without a signal. I am on stock everything, no rooting or custom Roms (yet). I always thought it had something to do with battery calibration being off and the tablet not having enough power to run, because it always works fine when I charge it before attempting to boot.
I have also noticed that every once in a while the screen will have a vertical line of pixels flicker.
Click to expand...
Click to collapse
+1 bro. I am having the same problem. what do we need to do ? it is same with all nexus 7's . should we claim the warranty or just neglect it ? wat say ?

Aditya88 said:
+1 bro. I am having the same problem. what do we need to do ? it is same with all nexus 7's . should we claim the warranty or just neglect it ? wat say ?
Click to expand...
Click to collapse
I faced the same problem. I dont know when the battery might have drained out, but on starting the tab on low battery, it suddenly started showing black screen with little grains and suddenly stopped with a noise. I charged, started the tab again while charging, and the battery reading stuck at 21% even after charging for 20 mins. Within 5 mins, it happened again. Now after 35 mins of charging, I start it again, it boots normal, and now its reading the battery percentage in an incremental value (started with 22%) and now its again stuck at 23%
Is this a HW related issue? Or do you think it is more of SW related issue? If it is more towards the HW side, we better have it replaced. Mine is C70 model.

bump
just happened to me... it may have run out of juice... didn't turn on when I tried, so I guess it did... then I put it on the charger, tried booting it, went away for a sec and when I came back I also got this black screen with some flicker and a static noise...
will now try to charge it over night before trying again...

Nexus 7/Google problems
I received my Nexus 7 on Aug 21 after hearing the rave reviews. It didn't come with app for a camera, so I downloaded one.
The camera didn't work. I re-booted it & it worked this time. Downloaded Skype - whole reason for getting the tablet - to stay in touch with family that is far away. Tried to Skype - camera wouldn't work. Rebooted - worked this time again (getting tired of having to reboot for something I want to use to work). On Sept 2, sent message to Google inquiring about camera & app I downloaded. Only response - "thank you for contacting...blah, blah, blah - check out Q&A." All along, the tablet would shut itself down & reboot randomly (battery fully charged sometimes). On Sept 13, I shut it down & charged it. After a full charge, I tried to power it back on. Tried again several times that night & then the next morning. Called Google (who I bought it from). Told them I didn't want a piece of junk that wouldn't work. He told me it was past my remorse period. (The only remorse I have is buying their piece of crap instead of a reputable one.) I finally did get it to come back on, but camera hasn’t work since even after a complete factory reset. Any way – in order to get this one fixed, I have to “buy” a new one, then send back the old one & be reimbursed. Is this a legitimate business practice?

hi,
since today i have the same issue. did nothing special, just swichting from g currents to chrome. stock rom, no modifications, not rooted, everything original
n7 suddenly had a black screen(battery was at 28%). nothing worked, no powerswitch(10-30 secs). when connected to original power supply and cable, it boots up.. google logo .. glowing X.. lockscreen. then, approx. 30 sec later it turns off again(screen black). usb cable still connected. after some time it comes up again.. and repeats the procedure. after some cycles it stops, and when i reconnect the usb calbe it starts over again. sometimes, before it turns black, it shows a flickering screen and sometimes fizzling sound.
any suggestions?

I had this same issue right after the 4.2 ota update, after leaving it on charge overnight it seems fine now after a couple of discharge / charge cycles
Its like after the update it was over estimating the battery level
Sent from my Nexus 7 using xda premium

Same thing!
I have a completely stock Nexus 7, and the EXACT same problems are happening to me too! The first couple of times it happened my tablet would reboot normaly. But now, my tablet won't boot up at all. Any suggestions on what I should do? Also, remember, I have no mods installed.

Happening to me too.My N7 shut itself down because of low battery a couple hours ago and I haven't been able to get it to boot since. When I plug it into the charger it shows a flickering screen like a tv with no signal but with less white flickers. I've tried multiple chargers and cables but I could only get it to boot up a couple times and both times it did not show that it was charging even though it was plugged in and the battery was at 0% so as soon as it boots up it shuts itself down again because of low battery.
So now I've got it on the charger, screen all a'flicker, waiting for it to get a charge but I've got a feeling its not even charging because, like I said, the few times it has booted it showed the battery at 0% and not charging.
I guess I'll try to leave it alone for a while and see if it will start up after being plugged in for a bit.
EDIT: I let it sit there and charge for about an hour or so (with the screen flickering) and I was finally able to get it booted. It said it only had 3% battery but now it seems to be charging as fast as usual.

devhen said:
EDIT: I let it sit there and charge for about an hour or so (with the screen flickering) and I was finally able to get it booted. It said it only had 3% battery but now it seems to be charging as fast as usual.
Click to expand...
Click to collapse
Yup... I've let mine sit there turned off and charging over night... helped!

Just had a problem with the Nexus 7 not charging when battery was likely fully depleted. Putting a charge cable in was automatically booting the Nexus 7 up and wouldn't charge shutting down right after. Loops going on and off. What I did was plug a charge cable in and hold power+both volumes and now I believe I am charging at the bootloader screen. It stays on so I will leave it like this and if it doesn't resolve the issue I will try recovery once it is charged.

I've just started having the same issue. Has happened twice when battery gets to 8%, suddenly jumps to 0, shuts down, then after a few seconds restarts itself. Gets to home screen for a few seconds, battery showing 8, then jumps to zero, switches off and has flickering blocks on screen with static noise. This keeps repeating, only way I have found to solve it is to load into bootloader, then select power off. Device charges normally then and once charged works fine. I am unlocked and rooted but running stock 4.2.1, think I'll just have to return it for a warranty claim.

Based on what you experienced, the lesson here is your device can't handle the GPU over clock of more than 446mhz or it will do some crazy stuff.
Sent from my Nexus 7 using xda app-developers app

[Q] nexus 7 suddenly auto turn off

hi all, today when my nexus 7 left around 15% battery, it showed the warning sign to ask me charge it, so i thought of finish download 1 small apps before charging it. just before i hit the install button, the screen suddenly turn off and whole device was power off.
i tried to on it back (press for 30sec) but no use. so i go and charge it, after trying many times, i finally managed to on it back, but just after few minutes, the screen appear many lines ( just like those old tvs) and it turn off again...then, i tried many times only i managed to on it back.
after that, i continue to leave it there to charge. but after almost 4 hrs( and still counting), the battery only 45%.
wat had happen to my nexus 7? previously i had no such issues, and normally i can fully charge it within 3 hrs. i just got it for 1 week, can anyone tell me what happened? will it damaged my device?
thanks.

no people facing same issue as me?

hey there, im facing the exact same issue and symptoms as you!
the sudden off, the old screen tv effect and shuts down again.
a battery logo appeared though and im leaving it to charge now. strangely it was showing 18%
im running cm10, what about you?

I've had the same issue for first 2 times I charged the Nexus, then it went away. Seems to be battery related, faulty battery?

Same thing happens to me as well. Happened on stock 4.1.2 and happens on stock 4.2 as well. I never try to let it reach below 20%, just to be on the safe side.

Me too!
ynrozturk said:
Same thing happens to me as well. Happened on stock 4.1.2 and happens on stock 4.2 as well. I never try to let it reach below 20%, just to be on the safe side.
Click to expand...
Click to collapse
It happens to me too
Not sure if it's battery related but it happened twice and this is what my battery graph looks like.
Anybody with more info?
I am also on CM10 using setCPU app to control CPU speed when the power is low.
There is one other thread talking about this:
http://forum.xda-developers.com/showthread.php?p=34878700#post34878700
I placed my info there too.
Edit: It's actually happened the last 3 days now ... I'm going to exchange it today.

I get a message "shutting down, low battery" I used to get message telling me to connect to charger. Before I could finish what I was doing now I have no choice. Seems to happen after update 4.3

fix
somehow the battery calibration is out. only fox is to leave it charging for about 20 mins before trying to turn it on. as by then only will the 'x' logo appear. OR if you cant wait popout the back cover, remove/unplug the battery it works. another longer fix is to. turn in back on after it is able to, go to battery settings refresh it, plgg and unplug your charger. the shutdown logo should appear again and when you look to the top, the battery % will revert to its correct amount of 0% try to do this as soon as it is able to be turned on.

[Q] Bricked Nexus 4?

So near the end of the day yesterday I realized my phone was dead / had **** down.
Every time I turned it on, it would auto shut off. I tried to charge it for a while and it would not turn on. It would not even turn on plugged in.
So I read on this forum to go into recovery, I tried that. It would say No Command and then turn off after a while. Then i tried to let the battery die. It did.
I would try to charge, it would show the charging animation, I would take it off the charger it would still continue to show the charging animation.
So I took it off the charger for a few hours. Tried it again nothing. This morning I have it on the charger, there is a red blinking light. No charging animation, it won't turn on. Nothing...
I read stuff and most people who have had similar issues either got the phone to turn on by flashing a new rom, or letting battery drain. But I can't do anything to phone.
On charge I try to power it on and go into boot loader nothing happens.
Anyone have any other ideas?
Edit: Called Google Support after posting this. They want to replace phone.

What rom / kernel did you use?
Sent from my Nexus 4 using xda app-developers app

If you can access the bootloader you phone is fine there is another thread here in Q&A about fixing red LED phones. Just be careful as I had the same thing and no my phone is completely unresponsive.
Hold the volume down button and the try plugging the phone into a PC/power outlet this should put you in fastboot mode from there try to flash the google stock images.

I just ordered the replacement phone.
I did not use any ROM or Kernel. I just used the phone as is. For recovery. I just chose recovery hoping it would have something come with stock.
I opened this phone on Monday.
Also yes. I tried the bootloader thing at first / last night. But slowly it lost all charger now it won't charge or respond. It just has a flashing red light.
Hopefully Google doesn't take 5-6 weeks with replacement phone. It took 6 weeks to get this one.

http://forum.xda-developers.com/showthread.php?t=2089390&page=2
http://forum.xda-developers.com/showthread.php?t=2011328
Read these two threads you should be able to recover from flashing red light.

[Q] Yet another Nook not holding charge and hanging at the boot screen

Google shows me I'm not even remotely alone in my trouble, but with the way tech works every problem is at least a little unique. I'll give a rundown of what I've down and whats happened up to this point.
First, I bought it used from Amazon. Very Good condition from a seller with 99% or whatever satisfaction. I think I've bought from them before, actually. So while this isn't a new device, I know I wasn't scammed. It was also factory reset and I'm assuming it wasn't rooted, though admittedly I have no idea how to check on a Nook.
Second, when it arrived the first thing I did, naturally, was turn it on. Plugged in the Nook to my computer, it booted up just fine, I registered, and loaded one a few ebooks with Calibre. The books opened up, they looked great, we were golden.That was when I noticed the battery indicator in the top didn't have a number on it. It was solid black with a ?. I thought that was weird, so I tried rebooting the device. That was when I was hit with an update, it downloaded and installed then rebooted. Here's when it all went to crap.
Third, I can get into the device. If I hold the power button and wait a bit it takes me to the homescreen where I'm met with a 0% Battery warning saying to plug it in or the device will shut off. Waiting for this message do disappear seems to give me normal access to the device, except the battery indicator is still just ?. This still happens now, after about 10 hours of charging.
Fourth, plugging in the device to anything be it wall charger or computer causes the device to reboot back to the Read Forever screen. Even if the device is completely powered off. It just hangs at the boot screen and goes nowhere. If I hold down the power button, or power + n, all it does is flash the screen to blank and then goes back to the boot screen. If I unplug it and hold down power it goes back to the previous problem.
That's everything I know. I seem to have the proper Nook micro USB cable, but the adapter is a little white Chinese looking thing so I know it's not the official. So I've switched to my Nexus 5's micro USB cable since I know it works and plugged it into my PC. The charging indicator is on, but thanks to my minor colour blindess I'm having a hell of a time deciding if it's orange or green. It's either green, orange, or yellow for sure though. Right now I'm going to go to sleep, let it charge through the night. I've had a similar problem happen to my Nexus 7 where it wouldn't turn on, and a nightlong charge seemed to fix it so who knows, this thread might be useless in the morning.
In the more likely event that it's still very useful, any help would be appreciated. And please try to keep it simple. I'm not new to technology or Android in phone/tablet form and all the associated hairpulling, but this is literally the first time I've ever dealt with an ereader. I'd like to get this solved at home, since I don't have a warranty and the price to ship this thing back to the seller would make this end up costing more than a new one would have since I'm Canadian and the seller isn't.
Thanks in advance.
Edit: After a night of charging, still 0%.

This, unfortunately, is the sign of a factory buggy (for lack of a better word) device. I doubt there's any hope. Sorry about that.
Keep me updated.

I think that there might be software to blame. My Motorola Defy also had that sort of weird battery behaviour after one of factory resets. Since then I have to install a patch written by one of XDA members every time I make a reset. But it works. Unfortunately I have no idea if it can be helpful in this case. (I'm refering to this post: http://forum.xda-developers.com/showpost.php?p=34590229&postcount=1 )
Nonetheless I would seek some slight hope in disconnecting and reconnecting the battery.

Alright, so. Progress report:
I tried the 8 failed boots trick to reset the device back to the original firmware. This brought me back to square one. The device worked, I could load books on to it via USB, and read them. But the battery indicator was just a question mark. Going into the settings revealed that the battery was at 100%, or at least claimed to be. But hey, I could read on it so I figured I was alright.
Now, a couple days later, I just woke up to find it with a new problem. Pressing the little N button to wake it up isn't doing anything. It won't respond to holding the power button down and my computer wont pick it up when it is plugged in. The charging light still comes on but I don't know how much it can be trusted.
I'm going to let it charge for a bit, but I'm beginning to think the battery is just toast.

Shodex said:
Alright, so. Progress report:
I tried the 8 failed boots trick to reset the device back to the original firmware. This brought me back to square one. The device worked, I could load books on to it via USB, and read them. But the battery indicator was just a question mark. Going into the settings revealed that the battery was at 100%, or at least claimed to be. But hey, I could read on it so I figured I was alright.
Now, a couple days later, I just woke up to find it with a new problem. Pressing the little N button to wake it up isn't doing anything. It won't respond to holding the power button down and my computer wont pick it up when it is plugged in. The charging light still comes on but I don't know how much it can be trusted.
I'm going to let it charge for a bit, but I'm beginning to think the battery is just toast.
Click to expand...
Click to collapse
Hi, I just went through something similar 48 hrs ago. The NST is frozen, stuck at reading forever. Before that, the battery icon had a '?', and the device info said battery status was "unavailable". Plugging in to charge had a solid green light.
I read around, and what worked was to open the case, and disconnect the battery. Google said to wait 30 mins, I waited 1. Re plugged in, put it to charge. The LED turned to orange, and 15 mins later, the NST booted. All good now.
Total cost: set of TORX scredrivers (you need a T5).

ghane0 said:
Hi, I just went through something similar 48 hrs ago. The NST is frozen, stuck at reading forever. Before that, the battery icon had a '?', and the device info said battery status was "unavailable". Plugging in to charge had a solid green light.
I read around, and what worked was to open the case, and disconnect the battery. Google said to wait 30 mins, I waited 1. Re plugged in, put it to charge. The LED turned to orange, and 15 mins later, the NST booted. All good now.
Total cost: set of TORX scredrivers (you need a T5).
Click to expand...
Click to collapse
Okay, so. No T5 but I managed it with a teensy weensy flathead. Unlugged the battery, left it that way for about 20 minutes, plugged it back in, then left it to charge. 15 minutes later I came back and viola, it works and the battery is reporting it's remaining juice. Thank you very much, that seems to have done the trick.
You know, this might be the first time I ever managed to have a tech problem solved entirely by a forum.

Shodex said:
Okay, so. No T5 but I managed it with a teensy weensy flathead.
Click to expand...
Click to collapse
You realise that that voids the warranty you get from XDA?
Shodex said:
You know, this might be the first time I ever managed to have a tech problem solved entirely by a forum.
Click to expand...
Click to collapse
I knew the Internet would be useful for something, one day

ghane0 said:
You realise that that voids the warranty you get from XDA?
Click to expand...
Click to collapse
It's a used device, there was never a warranty.

Looks like the problem is fixed. Great! Sorry I was inactive.
Later!

[Q] N4 doesnt turn on. Red Light blinks once.

Hello.
When I try to turn on my N4, I hold power button, and after about 10 seconds Red light blinks (just once, if it's connected to USB that 1 blink last for 3 seconds, if connected to wall, it's just quick 1 blink. If it not connected anywhere there is no action at all, it just stays dead, no blinks, nothing). Same if I try to go in bootloader by holding volume down+power.
This happened after I successfully installed CM12, with no errors. Then I rebooted my phone, and it just stayed black as it is now. Battery was around 25~30% that time, and phone was connected to USB.
Did I bricked my phone totally? I am now trying to charge it up already for 1 hour... but it nothing changes.
I have searched here for similar problems, but couldn't find solution...
Edit: Charging already for 10h+ , still same..
Edit2: I removed battery, reconnected after a while, still same problem.
So I tested it with multimeter, it says 2.6V, but fully charged must be 3.8V. Could this be a problem? I was charging it for whole night.
Edit3: I just got new battery . But it looks the same.. phone doesn't boot up.. same red light blinks once.. so.. its my phone is dead? I can't believe that...
When I connect to PC usb, there are unrecognized deviced called "QHSUSB_DLOAD".

easy fix
Hold down the power button and the volume down button at the same time until phone reboots. If you see the little android no need to worry just let go and wait for your device to reboot on its own. This is not a factory reset it's just like restarting your device. :good:

zelexon said:
Hold down the power button and the volume down button at the same time until phone reboots. If you see the little android no need to worry just let go and wait for your device to reboot on its own. This is not a factory reset it's just like restarting your device. :good:
Click to expand...
Click to collapse
I have tried that many times. Nothing. It's bootloader screen, but I can't get there. Nothing happens. If I keep holding volume down+power it just keep blinking once every ~10 seconds, same if I hold just power button. If phone is not connected to charger, there are no blinks at all.

I removed battery, reconnected after a while, still same problem.
So I tested it with multimeter, it says 2.6V, but fully charged must be 3.8V. Could this be a problem? I was charging it for whole night.

Cracken6 said:
I removed battery, reconnected after a while, still same problem.
So I tested it with multimeter, it says 2.6V, but fully charged must be 3.8V. Could this be a problem? I was charging it for whole night.
Click to expand...
Click to collapse
I had the same problem a year ago, I tried to remove the battery, charging all night, and other solutions that I found online and no one worked.
Finally I found here in XDA a user with the same problem and his solution was charger the phone with a wireless charger, a friend of mine has one and I put the phone to charge and after a few minutes the screen goes on and the phone was charged, then I press power button and the nexus run again.
Hope this works.
Sorry for my bad English, I'm from Spain.
Good luck.
(I bought a wireless charger in case it happen again)

I don't know anyone with wireless charger. I already ordered a new battery, and then I probably will get wireless charger also. Ty.
But this problem is very weird if you think so.. I think it happened because of many aspects together:
1) Battery was already below 30%
2) I pretty regularly charge phone with USB (won't do it again)
3) It was connected to PC USB in same time.
4) I installed CM12 ROM in same time
So main reason I think is USB, that I restarted phone while it was on pretty low battery and with USB connected.. phone restarted and got invalid voltages and couldn't even boot up or charge phone. I also found an article which says, minimum voltage, when phone battery has 0%, it's 3.0V, so I was below that.. it just screwed everything and battery died. Well, I am not sure for 100% that it's battery fault, but I hope so, I really love my N4 and still wanna use it for long time, I hope it's not dead phone, just a dead battery. Lets see! I will update this thread , when I get my new battery (less than month probably).
Sorry, my english is also not perfect. I am from Latvia.

I was playing when it happened to me. The phone was very very hot and the battery was around 70%. When I put in the wireless charged and I can reboot the phone the battery was at 65%, so it had charge but the phone won't boot.
I charge my phone almost every day, sometimes with AC, others with USB (plugging to PC) or wireless that depends of my needs
I hope you can fix it. Good luck.

Btw. Do you know if battery charges with wireless charger, if it's removed from the phone?

Don't think it does, since the receiving coils for wireless charging are located just behind the glass back.

Flipz77 said:
Don't think it does, since the receiving coils for wireless charging are located just behind the glass back.
Click to expand...
Click to collapse
The battery will charge with a NCF Charger
Major Issue Google
This "Nexus SOD" issue is showing up on many sites across the Internet. I have multiple "Nexus" devices including 2 Nexus 4, 1 Nexus 5, 2 "Nexus 7 2013". It suddenly started out of the blue with one of my Nexus 4 phones. Symptoms included rapid battery discharge. I am using Lollipop 5.1 on all devices. There are many claims as to the cause, Hardware Motherboard, Power Button etc. Others claim it is "Software Related" or App Related. The problem effects Nexus 4 and Nexus 5 phones. I have ordered a new motherboard for my nexus 4 device and see if that makes a difference.
This problem should warrant a "Major Android Lollipop Crisis Team" by Google to investigate the cause and let us know what it is and what Google is doing to solve the problem before moving to announce "Android M". This issue needs to brought up and actively pursued at the upcoming "Google I/O Conference" by the strong Android Developers Groups to press for "Formal Action"

charging method
Cracken6 said:
I have tried that many times. Nothing. It's bootloader screen, but I can't get there. Nothing happens. If I keep holding volume down+power it just keep blinking once every ~10 seconds, same if I hold just power button. If phone is not connected to charger, there are no blinks at all.
Click to expand...
Click to collapse
I had this problem a long time ago and my fix worked for me after doing a little research it seems like this is a case called battery total discharge. The fix was simply to charge your phone using the wall adapter that came with your phone (I still use my old apple cube wall thing) and to wait for the red light to appear then wait about ten minutes before trying to reboot.

I just got new battery . But it looks the same.. phone doesn't boot up.. same red light blinks once.. so.. its my phone is dead? I can't believe that...
When I connect to PC usb, there are unrecognized deviced called "QHSUSB_DLOAD".

Maybe this video will help you: Oh I´m not allowed to post links until now.
Just search for: - Nexus 4 "red light of death" fix - at youtube.
Hope it will help

AndRe5575 said:
Maybe this video will help you: Oh I´m not allowed to post links until now.
Just search for: - Nexus 4 "red light of death" fix - at youtube.
Hope it will help
Click to expand...
Click to collapse
I have checked all kind of videos there. Also that one. Most of these cases are related to battery, but it seems in my case it isn't. I just searched for QHSUSB_DLOAD unrecognized device, all posts says it means phone is bricked... But cmon, how? I installed CM12, successfully, without any errors, then just restarted phone, and its dead...

Cracken6 said:
I have checked all kind of videos there. Also that one. Most of these cases are related to battery, but it seems in my case it isn't. I just searched for QHSUSB_DLOAD unrecognized device, all posts says it means phone is bricked... But cmon, how? I installed CM12, successfully, without any errors, then just restarted phone, and its dead...
Click to expand...
Click to collapse
Did u try booting the phone without battery by connecting to wall charger and what about flashing stock ROM via PC
Also check that the power button works
This case should be solved

as9333 said:
Did u try booting the phone without battery by connecting to wall charger and what about flashing stock ROM via PC
Also check that the power button works
This case should be solved
Click to expand...
Click to collapse
Just tried booting without battery, and connecting to wall. Same - red light blinks once, after I hold Power button or Power+Volume down for about 15 seconds. If I keep buttons pressed, it just repeats every ~15 seconds.
Power buttons works fine.
After I checked that Device manager thing in google.. it looks very bad.. phone is dead.. probably need to change motherboard. I am just shocked, how this could happen... I didn't receive any errors during CM12 installation. Phone just instantly died after restart.