Random reboots [new, stock, unrooted] - Verizon Samsung Galaxy Note II

I'm trying to figure out if i need to return a new note I bought 2 two nights ago from Verizon brick and mortar. It is periodically rebooting. The screen was also glitchy towards the end of the first 24 hours (height of reboots) but has been fine since I did a factory reset.
But it STILL reboots itself occasionally. All I have installed since wipe is xda, tune in radio, Google voice.
I have had power saving turned on the whole time with screen brightness at or near minimum.
Is the some log I can check to see what is causing the reboots?
Is there some way to return this device without winding up with a refurbished replacement?
Glad I haven't rooted yet as then I'd be sure it was something I caused.
Sent from my SCH-I605 using xda app-developers app

Also, u don't know if it's helpful but I have a 32gb SanDisk ultra installed. I will reformat it now. Running alogcat I so far all I see is an error about being unable to open trace file and a repeated error every minute of so saying that spans cannot have a zero length.
Sent from my SCH-I605 using xda app-developers app

Just got mine this week as well and experienced the random reboots. Mine was more due to large amount of processes running at once. It did it around 5 times but only when it was fetching multiple downloads from Play store. Yours is doing it for no reason while it is just sitting there?

I had 2 random reboots day 1 of my phone and nothing since. I just chalked it up to gremlins.

Has happened listening to streaming audio but today rebooted once and froze once requiring a battery pull while just on Web (stock browser) or xda. The screen issues which seem to have gone away after factory reset were blinking/sparkling lines as screen refreshed and also earlier in the day an insensitive capacitive screen (the stylus worked fine). The sensitivity problem was first symptom but has not reappeared after wipe. A lot of the day I have the phone in my pocket with headphones plugged in but not necessarily in my ears so could have missed loss of reboots.
Sent from my SCH-I605 using xda app-developers app

Take it back to vzw and get a new one. I'm using a sandisk 32gb microsd card and my phone doesn't reboot, but I don't see how a microsd card could cause random reboots.
Sent from my SCH-I605 using xda app-developers app

I don't see how either but searching other forums there was some indication that a bad card could cause otherwise unexplained problems so I thought I'd mention it. I swapped it for my wife's card anyway.
I just don't like the idea of swapping a new phone for a refurbished one which is presumably what they will try.
Sent from my SCH-I605 using xda app-developers app

If you just bought it and return it to the store you got it from, I would think that they will give you a new replacement (assuming that they have inventory on hand). I can't imagine that there would be many refurbs in the channel yet anyway since the phone has only been available for 2 weeks.

No issue here with stock non-rooted. You can also try ODIN'ing the stock image before you resort to returning it.

No reboots for me. Does not matter if stock, rooted,bootloader unlocked with beans version 2 ROM and even overclocked to 1.8ghz using different kernal.
A good test is to factory reset and don't sign into Google upon reboot. Just play around with the apps that came on the phone. Maybe download a stress test App from the play store and let that sucker run for a few hours.
Edit:
I'm using a 64gig card and formatted it to Fat 32 to make it compatible with twrp recovery. Maybe just leave out your SD card to make sure.

It started behaving badly while running the steers test and also streaming audio, browsing Web, etc.
Attached is the battery usage plot and you can see it seems to have went from 30% battery to 15% then after putting it in the charger it started to charge normally then jumped back up to the level it should have been at. There is also an earlier smaller blip like this.
Maybe a problem with a power regulator? Think it's going back tomorrow.
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It took a couple hours at the Verizon store but managed to walk out with a new replacement phone and new sim .
Hopefully the problem is gone though it occurs to me that I should have gone to a different store so at least there was a chance of our being from a different lot. Oh well.
Thanks all for the help.
Sent from my SCH-I605 using xda app-developers app

Just an update: still no problems on the new ( replacement) phone. First was just bad. I kept this stock for a week or so before unlocking. The first was completely unadulterated.
Sent from my SCH-I605 using xda app-developers app

Related

Micro SD won't lock or mount

Hello Everyone,
Today, I was trying to clean my Galaxy S2 and so I attempted to remove the Micro SD card (probably for the second time ever since I bought the phone). Anyways, quite gently I removed the card but after cleaning and putting everything back together, I tried to insert the card back but it wouldn't lock with the card slot and as a result, the micro SD card would not get mounted and I wouldn't be even able to put the battery back on since the card does stick out a bit. Anyways, being a fool I tried to jam it in and yes the battery went in and the phone started but I reckon I damaged the card slot even more than it was previously damaged.
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I have tried everything. I disassembled the phone's rear end and tried to see if I could tinker with the lock in the card slot but to no avail. I believe the slot is directly attached to the mainboard and as a result, I haven't been able to do anything else about it. I believe the lock in the slot has been damaged and so, it won't take in the card completely. So just to be clear, this is all physically gone wrong. The card slot has a lock that clicks everytime you insert the card successfully, unfortunately it has stopped clicking on my phone and I am now missing out on 16/32gb worth of files etc.
I am not sure what to do so any advice from y'all would be greatly appreciated. I will try to take it to the Pacific Mall in Toronto tomorrow. I reckon only they can fix it and since my phone voids the Sammy Warranty, I'd have little or no chance of getting Samsung to fix it for me without costing me handful. If anyone of you has been on the same situation before, please feel free to share any tips or advice. I'd greatly appreciate any suggestions.
All you can do is take it to repair...
Sent from my Sgs2 via Xda Premium. Helped? Click thanks button!
Thanks for replying. I am now realizing that more and more. Will see what happens later today. Anyone else ever stumbled upon something like this?
Sent from my GT-I9100 using Tapatalk 2
Try removing the card and getting a very small brush and see if you can clean the port at all. It seems too strange that when you removed it you can't replace it in the port again. Sounds like debris but it doesn't seem right. If you clean the port and no luck, return your phone to stock and send it off for repair, and play dumb, nearly always works.
Sent from my GT-I9100 using Tapatalk 2
themadba said:
Try removing the card and getting a very small brush and see if you can clean the port at all. It seems too strange that when you removed it you can't replace it in the port again. Sounds like debris but it doesn't seem right. If you clean the port and no luck, return your phone to stock and send it off for repair, and play dumb, nearly always works.
Sent from my GT-I9100 using Tapatalk 2
Click to expand...
Click to collapse
Haha thanks for the awesome suggestion. I had been at Pacific Mall, store name is Cell 123, none of the other stores were willing to take the risk to fix the sd card slot. Basically its not dirt, its the connectors within the slot that seem a bit out of place. Can happen easily with wear and tear and if you like me pull and push the sd cards a lot. Well then it can definitely happen. Just one of those things I hate about Samsung. The quality of some of its hardware is not top notch.
So after 2 hours of playing with the slot, the store owner nailed it. It's not completely fixed though. Most of the time, the phone reads the sd card without any issue but 2 times already, it has failed to recognize it. I believe the lock is loose and as a result, the micro sd moves around and cant stay in its fixed position, so the phone fails to read it at times.

It's Dead Jim

Last night I was sitting down onto "the thrown" withe the phone in my back pocket....it caught somehow and flipped into the bowl. Screen was off....I immediately put it in rice over night....7 hours later I tried it....no go. She's dead. Dead I tell you!
The first power up went OK....here was a weird couple beeps, but it powered up, then when the OS came up it seemed like there were buttons pressed because it started to wig out. I immediately pulled the battery....next powerup it wen right into bootloader mode......but my computer wouldn't recognize it....third power up it' dead.
Totally sucks.
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When it first started having issues and you pulled the battery, you should have put it back in rice for another 8-12 hours.
You should have gave it 2-3 days to dry.
Sent from my SCH-I605 using Tapatalk 2
My girl did that to her s3 I put it in silica packs
Sent from my SCH-I605 using xda app-developers app
I heard when you drop your phone in water the worst thing to do is to power it back up immediately after the drop.
Sent from my unlocked, and overclocked Galaxy Note 2 running bean's rom
SH*TY man, i hope you had insurance on it
nnnnr14 said:
I heard when you drop your phone in water the worst thing to do is to power it back up immediately after the drop.
Sent from my unlocked, and overclocked Galaxy Note 2 running bean's rom
Click to expand...
Click to collapse
This is right.. If you have any chance of saving the phone, never power it on for a day or so. I don't think rice works that well, i've dropped many phones in water and the best way I have found to actually save the phone is to put the oven on a very low heat, put it in the oven w / the door open, and then let it sit for a day or two.
YMMV, but if you turn it on and it starts acting funky it is almost always 100% dead.
First Cut a hole in a box. ...
Put the phone in the box
And put a hairdryer on low for 6 or so hours.
It is one method used for "baking tape"
Sent from my SCH-I605 using xda app-developers app
j9k said:
First Cut a hole in a box. ...
Put the phone in the box
And put a hairdryer on low for 6 or so hours.
It is one method used for "baking tape"
Sent from my SCH-I605 using xda app-developers app
Click to expand...
Click to collapse
I have to admit, I thought this was going a completely different direction after reading the first line.
kimdoocheol said:
This is right.. If you have any chance of saving the phone, never power it on for a day or so. I don't think rice works that well, i've dropped many phones in water and the best way I have found to actually save the phone is to put the oven on a very low heat, put it in the oven w / the door open, and then let it sit for a day or two.
YMMV, but if you turn it on and it starts acting funky it is almost always 100% dead.
Click to expand...
Click to collapse
agreed, my oven has a warm setting that's about 160-200 degrees. Works well to dry out electronics.
take the phone apart
remove motherboard
clean all contacts with at least %90 alcohol.
put back together and you might be working again.
sudermatt said:
Last night I was sitting down onto "the thrown" withe the phone in my back pocket....it caught somehow and flipped into the bowl. Screen was off....I immediately put it in rice over night....7 hours later I tried it....no go. She's dead. Dead I tell you!
The first power up went OK....here was a weird couple beeps, but it powered up, then when the OS came up it seemed like there were buttons pressed because it started to wig out. I immediately pulled the battery....next powerup it wen right into bootloader mode......but my computer wouldn't recognize it....third power up it' dead.
Totally sucks.
Click to expand...
Click to collapse
Did you get rid of the rice?
Meatwrench said:
Did you get rid of the rice?
Click to expand...
Click to collapse
LMAO!!!!! Nice... LMAO
Sent from my SCH-I605 using xda app-developers app
Google #alcohol bath for cell phone". It actually worked for me.
Sent from my SCH-I605 using xda premium

Yup... So I just may have *REALLY* bricked my GN2

Did an ODIN restore to Stock Image w/root & bootloader unlocked preserved .
SUCCESS
Booted up and did minimal config. Checked email.. Surfed the web.... made a few calls and txt.
SUCCESS
Booted ClockworkMod Recovery and began install of JB 14....
HANG
Tried powering on the phone......... nothing
Tried CWM Recover boot... red light blinks every few seconds
Tried Download mode w/ODIN... nada ... faint red light blinks every few / 10 seconds.....
Battery was at 80% or so when I started CWM Flash.....
And there ya go... Glad I have insurance ?
Anyone got any ideas before I have to take a walk to the store and pickup a loaner? LOL
Just as an FYI:
This had NOTHING to do with the specific ROM..... It was some hiccup during the flash process in CWM... I've switched back and forth between every rom on here w/o a problem back and forth several times. I just must have angered the flash gods at some point today because all I get is a faint red flash on any power attempt (much like my Xyboard on a completely dead battery)..
I do however wonder if during the day while TMO ported my number from VZW that Verizon didnt send some death / self destruct code to my phone LOL
cjk2010 said:
Just as an FYI:
This had NOTHING to do with the specific ROM..... It was some hiccup during the flash process in CWM... I've switched back and forth between every rom on here w/o a problem back and forth several times. I just must have angered the flash gods at some point today because all I get is a faint red flash on any power attempt (much like my Xyboard on a completely dead battery)..
I do however wonder if during the day while TMO ported my number from VZW that Verizon didnt send some death / self destruct code to my phone LOL
Click to expand...
Click to collapse
Glad you clarified that, some just see the ROM and assume it is the cause. By the way how was your battery during flashing. It could actually be dead. Jay a thought
Sent from my SGH-T889 using xda app-developers app
Battery was @ 60% ....
Went to Store and swapped with a full battery just to be sure and same problem.
NO Vol Up + Home + Power
NO Vol Down + Home + Power
NO Power Btn Alone
NO Battery Swap
No love....
cjk2010 said:
Battery was @ 60% ....
Went to Store and swapped with a full battery just to be sure and same problem.
NO Vol Up + Home + Power
NO Vol Down + Home + Power
NO Power Btn Alone
NO Battery Swap
No love....
Click to expand...
Click to collapse
That Sucks. Guess it's jtag time
Sent from my SGH-T889 using xda app-developers app
kintwofan said:
That Sucks. Guess it's jtag time
Sent from my SGH-T889 using xda app-developers app
Click to expand...
Click to collapse
Completely cant find my 300K Resistors Off to RadioShack I go
Anyone around brooklyn with at RIFF or JTAG box?
I ended up going to my Local VZW Store (still under active contract for a few months) despite using TMo.
Told them I flashed back to Stock image.... then was loading a ROM again to remove bloatware and it went bananas on me. They looked up my acct ; I have been paying more then $200/mo for nearly 4 years now........ The rep was really knowledgeable about 3rd party ROMS/Rooting and said he would send me out a new phone tomorrow under extended warranty. Also said they just send it back to Samsung who just hardware flashes it and sends it ous as a REFURB unit since it was in literally MINT condition (Otterbox Defender) since Day 1.
Moral of the story: Was honest and expected nothing other then a "sorry buddy... you are out of luck" .. told him the truth and got a replacement (he even switched my titanium grey to white on the replacement). Didn't file a bogus insurance claim and the rep who is an asst mgr at the store was an ACE. If their costs monthly weren't so high I would be inclined to stay with VZW; but a few lines for me the wife and my kids on there is giving me an unnecessary beating to the tune of 2X my TMO costs.
For all the misgivings about VZW ...... I have to say its not the company........ Its being lucky enough to get a rep that isnt a hardon and appreciated me not giving him BS.
+1 VZW assoc mgr man.
+1 Karma
+1 Finally white Note II
Well good. I was actually thinking that your situation sounded like the emmc sudden death anyways. Just at a really bad time
Sent from my SGH-T889 using xda app-developers app
kintwofan said:
Well good. I was actually thinking that your situation sounded like the emmc sudden death anyways. Just at a really bad time
Sent from my SGH-T889 using xda app-developers app
Click to expand...
Click to collapse
Def was too weird AND out of left field. I even pulled out the soldering gun and sacrificed 2 usb cables and made a 300K Ohm and 301K Ohm jig and still nothing. Short of a full on JTAG / RIFF / Medusa attempt I don't think there is hope for this thing.Emmc sudden death seems possible at the most inopportune time; but it may just as easily be a power circuit failure based on what I am seeing with the meter and three batteries.
Thanks for the story, hopefully I don't have to experience it anytime soon
Sent from my SCH-I605 using xda premium
New phone is here and already Unlocked/Rooted/JellyBeans 14 on it
Aluminum decal for that GOD_ AWFUL home button arrives tomorrow !!
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[Q] Irregular behavior on the touch screen

Hello, I read that sometimes the touch screen do not behavior the way it should be. For example, touching it does not lead to the right response while sometimes the device responded without the user touching the screen. Has that issue been fixed yet?
happens only if u r using a cheap charger.
I don't have a huge issue, or an issue at all, but i just came home and i noticed that my Ultra doesn't like low temperatures. It's 4 C here and after i came home, i noticed that the screen was "ghosting", i.e the screen lagged behind when i swiped, like a shadow. It stopped after a minute, but come on.. 4 C isn't that cold. Electronics should easily handle down to -20 C without any issues.
I had major phantom clicks until. 290 rom, now have hardly any at all.
Sent from my C6833 using XDA Premium 4 mobile app
Thanks. Do I have to root the phone to resolve the issues?
How the charger affect such behavior?
LordManhattan said:
I don't have a huge issue, or an issue at all, but i just came home and i noticed that my Ultra doesn't like low temperatures. It's 4 C here and after i came home, i noticed that the screen was "ghosting", i.e the screen lagged behind when i swiped, like a shadow. It stopped after a minute, but come on.. 4 C isn't that cold. Electronics should easily handle down to -20 C without any issues.
Click to expand...
Click to collapse
I use mine in -30 and haven't noticed any problems,
hassanmahmood said:
I use mine in -30 and haven't noticed any problems,
Click to expand...
Click to collapse
Ah yes, Canada I've used it out in the cold before, but the thing that happened today hasn't happened before, so it's a little strange. It's still winter though, so we'll see if it happens again.
Sent from my C6833 using Tapatalk
hajime_android said:
Thanks. Do I have to root the phone to resolve the issues?
Click to expand...
Click to collapse
I'm Un rooted on 290 with zero issues
Sent from my C6833 using XDA Premium 4 mobile app
---------- Post added at 09:02 AM ---------- Previous post was at 09:01 AM ----------
SpyderTracks said:
I'm Un rooted on 290 with zero issues except bluetooth dropouts with a2dp. That's being addressed in 114
Sent from my C6833 using XDA Premium 4 mobile app
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Click to collapse
Sent from my C6833 using XDA Premium 4 mobile app
Phone badly ghost clicks if screen gets vapour on screen say if just woke up at night it's abit cold but hot air makes vapour come on screen. The screen goes mental then. Or if you have a dirty mark on screen like finger print. If you turn screen on it tries pressing different things where that mark is. This is only phone I've had problems with. I've never had a screen protector on it I expected the factory one to stand up to job but it is shockingly sh**. I don't want to remove it myself though. I want to try Sony in UK see if they will change it. And where I was always using micro Usb to charge as that is most usual basic way. The plastic seal has pulled off. Tbf in the couple months I've had it I've liked it. But would much rather have the htc one max
Sent from my C6833 using Tapatalk
God damn it.. It happened again. I was out walking for like 20 minutes and the screen started to act up again.. A reboot didn't solve it until Android was fully booted, so I'm not sure what the issue might be. It can't seriously be the temperature. It's a couple of degrees (Celsius) here today and sunny, and electronics should easily handle above zero temperatures. Heck, it should handle -20.
I'm going to do a factory reset and put it in the freezer for 10 minutes and see what happens
The annoying part is that Sony has a repair center only 15 minutes from here, but I called them and they don't have the right equipment to repair waterproof phones. They can open it, but they can seal it again, so they would basically void my warranty when they fixed it.
Sent from my C6833 using Tapatalk
It came back after 10 minutes in the freezer, and I managed to take some pictures of it.
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It goes away by itself after a couple of minutes... This is clearly a hardware defect.
Sent from my C6833 using Tapatalk
LordManhattan said:
It goes away by itself after a couple of minutes... This is clearly a hardware defect.
Sent from my C6833 using Tapatalk
Click to expand...
Click to collapse
Saw this in ny times... Not quite the same but related perhaps.
http://nyti.ms/1fd7827
Sent from my C6833 using XDA Premium 4 mobile app
SpyderTracks said:
Saw this in ny times... Not quite the same but related perhaps.
http://nyti.ms/1fd7827
Sent from my C6833 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
Well, yes and no Mine doesn't shut down or anything, but the screen simply washes out (like in the pics). It's back to normal after about a minute though, but it's really annoying. It doesn't even happen at temperatures as low as -20/-30, but 0-5 degress (celsius) (32 to 41 F). Hassan (our ZU Canadian) has even used his Ultra in -30 without any issues, so i guess mine's defective. That was what the support dude said at least (something something about a display part not being properly something something).
I really really don't want to be without it for like 4 weeks, but i don't know if i can live with this. Granted, the temperatures outside will rise pretty soon-ish, but i'll always know that the poor little fella is freezing its pixels off whenever i open a refrigerator

[Q] Scrambled Screen/display

I've been facing scrambled screen/display off late. Occurred thrice past week when I was browsing in chrome and while watching videos on YouTube. It just occured after 10~15minutes of use. Never occurred while I was gaming. (Only play FIFA15 occasionally). I'm much worried as this may brick my device. No sure if my GPU is the real culprit. I'm running lollipopalooza 5.1.1 with no extra kernel. Have this issue only after I installed lollipopalooza. Should I flash stock and check the issue with google service center. Kindly help!
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Your nexus is defective, just return it to stock if you can & get another one. No point in trying temp fixes for a hardware defect, besides it's under warranty so HTC won't give you trouble. Another user had this problem & I think they returned theirs for another.
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Mine was doing this last week, reflashed factory image, did a factory reset as well and not done it since. Not convinced it's a hardware fault unless it starts doing it again after the wipe. Been 4 days without any issues, wouldn't go more than a few hours without getting it before.
http://forum.xda-developers.com/showthread.php?t=3067672
Hate to say it, but im convinced it is a hardware problem/failure. My N9 started doing it 6 months after I bought it.. N9 would freeze even with fully stock(factory reset) kernel/ROM, and even happens with tablet in safe mode.. The freeze/crash prerequisite conditions are:
1. Battery less than ~20-30%
2. Connect charger(may or may not cause/create the condition)
3. Browse the web on Chrome (or do some cpu /GPU intensive task to heat up the device)
I'm not 100% sure these will make your tablet freeze, but my tablet became progressively worse within a month of it beginning to happen, and freezes began after I started testing kernels and ROMs for a month or 2 (I ran the tablet stock for first 4 months without any issues)
HTC rma'd my device.. Claimed they changed the mainboard.. Been using for a month now, on custom kernel/rom, and device hasnt had a scrambled screen crash/freeze [knock on wood] !!!!
Sent from my Nexus 9 using XDA Free mobile app
oh joy, this looks identical to the "nvidia defect" (look it up) my new 2000$ laptop had several years ago that they refused to fix, where the gfx chip would literally fall off the board if it got too hot because they used tainted soldier and junk cooling setup. oh please I hope this is not the case again.
Sent from my Nexus 5 using Tapatalk
Just unplugged the power cord from the main board and plugged it back.
This is the exact guide and steps I followed https://www.ifixit.com/Guide/Nexus+9+Rear+Facing+Camera+Replacement/36892 (except step 3 and 5 which I skipped completely)
I have fixed 2 tablets.
NoLimits71 said:
Just unplugged the power cord from the main board and plugged it back.
This is the exact guide and steps I followed https://www.ifixit.com/Guide/Nexus+9+Rear+Facing+Camera+Replacement/36892 (except step 3 and 5 which I skipped completely)
I have fixed 2 tablets.
Click to expand...
Click to collapse
Looking for this exact issue with screen scramble and thankfully found this post despite age of the thread... So when you say you unpligged power coard from the main board, which steps do you mean in that ifixit guide? and you have any idea why this solved it?
I'm about to throw mine away. Google and HTC wouldn't fix mine being like 15 months old last time I checked. Got it at launch. I got sick of playing phone tag and complaining. It was a good tablet for the first year before it started overheating instantly at every use.
Greefus said:
I'm about to throw mine away. Google and HTC wouldn't fix mine being like 15 months old last time I checked. Got it at launch. I got sick of playing phone tag and complaining. It was a good tablet for the first year before it started overheating instantly at every use.
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Yeah. This problem happened to my first N9, luckily I got a replacement from HTC. Now the screen in the replacement is going bad (discoloration, really bad light bleed). I was thinking of buying the HTC manufactured Pixel to replace my aging LGG2, but if the N9 is indicative of HTC build quality when working with/for Google, no thanks.
NoLimits71 said:
Just unplugged the power cord from the main board and plugged it back.
This is the exact guide and steps I followed https://www.ifixit.com/Guide/Nexus+9+Rear+Facing+Camera+Replacement/36892 (except step 3 and 5 which I skipped completely)
I have fixed 2 tablets.
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Just wanted to say I had the exact same problem. Tried factory resets and everything I could think of and none of it worked. Gave this a try, popped the back off the nexus, disconnected and reconnected the battery cord and now everything appears to be fine. I've been taxing my battery, playing videos and games and ran it down to 40% with no crashes. Thanks! I never would've thought to try this and am still not sure what it fixed, but I'll take it!
NoLimits71 said:
Just unplugged the power cord from the main board and plugged it back.
This is the exact guide and steps I followed https://www.ifixit.com/Guide/Nexus+9+Rear+Facing+Camera+Replacement/36892 (except step 3 and 5 which I skipped completely)
I have fixed 2 tablets.
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Click to collapse
I did as what you've said and it worked. Thanks a lot. But today, which is 20 days later, this **** happen again. So I just repeat. Damn it, this is the reason why I don't give a **** on HTC-Made Pixels.
Figured i post here to say i had similar issue for a while now
Bought this tablet when it first came out... Wasn't too impressed but i already promised my n7 to a family member... Eventually got a shield tablet but never got rid of this one but use them both a fair amount
About a year ago the tablet really started to slow down a bunch, and i don't keep much on here, mostly just use it for netflix and YouTube
Occasionally a rom/kernel change or full wipe would fix it, but it always slowed down faster than anything else
Around 6 months ago (maybe don't remember when) i occasionally got a pure white screen or the scrambled screen and would have to hard reset
About a month or so ago i researched it, found out about the battery trick and did this, hasn't happened since. Not only this but tablet has become far more responsive (never been buttery smooth as one would think it should) like day one and has stayed this way
Even doing full wipes and new rom/kernel wouldn't make it as snappy
Also i noticed that one of the wires going into the harness was a bit loose so i snugged it in tight
TL;DR:
For those with the scrambled screen and those with slow response tablet - open up your tab and remove battery terminal, check the wires and contact points, reassemble
Now you should be golden
Disconnecting and reconnecting the battery worked for me.
Watching “How to Replace Your Google Nexus 9 Battery” on YouTube helped a lot.
Didn’t have a spudger. I tried a guitar pick, but my plastic putty knife came in most handy.
I agree with LC that it is probably a battery issue as the same thing happened to me a couple years ago. Reconnecting the battery was a temp fix but replacing the battery solved it.
Good luck finding a new battery as supply had dried up.

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