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[Q] Samsung GalaxyS2 won't power on

Hi everyone, I appologize in advance if this has been posted and resolved, but I couldn't seem to find anything after numerous searches.
I have a Samsung Galaxy S2 that I have had for JUST over a year (i think June 30th) Everything has been fine, no problems and today I was on it, working fine and then all of a sudden it shut off and then started to reboot. Only when it powered back on, it showed the black SAMSUNG GALAXY SII powered by Tmobile start up screen, then went black, then the startup screen appeared again, then went black...repeat.
I did a battery pull for 2 minutes, same thing. Did a battery pull for 1 hour, same, I left it on the chargert for 4 hours and while on charger kept blinking on and off but now only the grey battery (even now off the charger)
It has never been rooted, or updated or anything like that. There is no water damage at all.
I have a wall charger for the battery only and an extra battery and have tried charging both batteries with that and still no luck.
I have also tried plugging it into my computer to see if it would boot up that way and nope. Still just the on and off dead battery, not even the startup screen.
HELP PLEASE!?

power shortage?
Has there been any kind of problems with your electric house system? that happened to me once, and it was due to a power problem at my house, it basically blew off my battery. Forget about battery pulls. Go to a store and ask them to lend you a battery for a second. If it powers on fine, it's the battery. If it doesn't i think you should get yourself a new phone, or try to get it fixed at the customer service. Sorry for the bad news man...

Nope, no problems with electricity, and neither of the 2 batteries will work!

[Q] Blank screen when turning on phone?

Hi, I'll explain what happened.
My phone recently turned off (the screen kind of fizzled away to black) So I assumed this was the battery running out. When I got home I put it on charge and as I usually do waited a few minutes, then tried to turn on, to charge whilst on, the screen lit up the phone vibrated and the start up tune played, but only a lit up blank screen appeared?
I thought it might need more charging so I removed the batter to turn it off and put on charge again, whilst it was "charging" there was a flashing amber light for about 4 seconds at a time, this never turns steady or green, when just leaving on charge.
After numerous batter removals and replace the phone still does the same thing when turned on, but now with no sound, and still appears if the screen is on but blank and the four soft keys are lit, then if I press the power button or if I leave it, the screen goes off itself until I press the power key again (this same thing that would happen if going to lock screen). All of this happening with a now flashing green light?
I tried to access phone by USB cable and although laptop picks up fact something is plugged into USB, it doesn't appear on HTC sync or memory card doesn't appear.
When trying to hold in volume down and power on it's as if it's going to the right screen but still blank.
Stock rom on phone, S-OFF
Anyone have any ideas, without replacing phone?
Thanks

its seems like your phone has bricked.
1. First try this
2. if step 1 doesnt work, follow this
read step by step. good luck!

Have you tried a new battery? My phone went completely black while charging and it showed no signs of life, no charging light nothing. It was a new battery with about 60Percent charge when I put it on the charger. I noticed like you did, I tired to charge more but not even a light would come on. I happened to have another fully charged battery I kept as a spare. When I put the spare battery in, the phone sprang back to life! I threw the other battery away and have had zero problems since. So I suggest you try a new fully charged battery before you do any thing else. Strange thing was the battery I was using was fine the day before and even had the 60 percent charge when I put it on charger. I'm not sure how it happens but somehow the battery just died on charger. So give a new battery a try and see if it will also help you. If it doesn't, then likely it's failure of your device. But please do try because the exact same thing happened to me and the new fully charged battery fixed the problem! I'm hoping it will also fix it for you! Best of luck! You can get a good battery online for under 20 dollars. I recommend Anker extended battery. I really hope this works for you! Let us know.

badboy47 said:
its seems like your phone has bricked.
1. First try this
2. if step 1 doesnt work, follow this
read step by step. good luck!
Click to expand...
Click to collapse
Thanks for the reply, I'll try these two and let you know what happens,
realsis said:
So give a new battery a try and see if it will also help you. If it doesn't, then likely it's failure of your device. But please do try because the exact same thing happened to me and the new fully charged battery fixed the problem! I'm hoping it will also fix it for you! Best of luck! You can get a good battery online for under 20 dollars. I recommend Anker extended battery. I really hope this works for you! Let us know.
Click to expand...
Click to collapse
I'll try this as a last resort and if not I'll get a new phone, cheers and I'll let you know what if anything works

So I get to the point where I have to ./brickdetect.sh and the phone isn't picked up or recognised, any idea how I can get the laptop to pick up the connection properly?

Almost dead Nexus 5

Here's my little story. I dropped my N5 and cracked the screen. It worked, but I wanted it to be pretty again. So I bought a screen/case and proceeded to do the swap. I watched several videos, read guides, etc and followed them step-by-step. After it was done, I was surprised how smoothly everything went. I then went to power it up and got nothing. I checked all the cable connections, reseated them, and still got nothing. I put everything back with the cracked screen. Still nothing. I check the cables carefully, there are no cracks or breaks in them. I left it on the charger all night and the next day, checking periodically, still nothing. I checked the battery connector with a multimeter, and it was getting a reading off it, so the thing must be receiving power, right? Anyway, I gave up for a few days, busy with the rest of life.
I came back to it one day, plugged it into the charger and this time I got the red blinking light. I searched around, and that seems to indicate the battery had lost it's charge completely. Again I charged it overnight, still nothing. I got adventurous and removed the battery and tried powering it with just the power cable plugged in. This time it displayed the charge full battery/lightning icon. Success! I hit power and it starts to boot, displays the Google logo, then shut down after maybe five seconds. So, it must be getting power through the system from the USB port. The mainboard/cpu/screen works, it's able to start booting. It even boots to the bootloader, keys work there.
Again I turned to the problem being the battery. I picked up another, thinking perhaps mine had gone bad somehow even though I never had a bit of trouble out of it (about 1.5 years old). I played with it some more, with either battery inside, it doesn't do anything. Without a battery, it starts to boot but gives up. Hoping I could get something from the bootloader, I plugged it into my PC, but the USB port doesn't seem to provide enough juice to get it back to the bootloader with no battery.
Finally, during one of my tests, I plugged in the battery while it had the charging cable in. Then it popped up the battery charging animation. Exciting! It must be successfully charging, now. Previously, it didn't display anything when I charged it for many hours. Now it's been charging about six hours. The battery animation still shows it filling from the bottom, usually it would blink the animation from like halfway to the top, right? I hold the power button, and the battery animation disappears and it goes dead yet again. I run the same tests, battery in, battery out and get the same results. It boots when there's no battery and the charging cable in, nothing when the battery is in with or without the charging cable.
So, here I am stuck again. Any other ideas? Thanks.

Battery dead, not charging, stuck on "low battery screen", bootloops with forceboot

Battery dead, not charging, stuck on "low battery screen", bootloops with forceboot
Hello people, this is my very first post on xda, even though I've been lurking around for about a year. The community has helped me a lot, I'd like to thank you all for that.
Back on topic though! My error seems to be very similar to the one here.
I was watching some YouTube, battery sitting on a respectable 85%, when it suddenly shut off. Not the usual "shutting down for low battery" kind of shutting down, it was istantaneous, more like the battery was unplugged from the phone. Which is clearly impossible. I tried to boot it using the power button to no avail. I connected it to the charger, and the "the battery is too low" screen popped up. I left it at that for about 45 minutes, then unplugged from the charger and tried to boot. No success. The battery didn't even charge; the charger should be is fully working.
So I tried leaving it plugged to the charger and force boot the phone via volume down and power button; it attempted to boot, but stopped midway through, bootlooping until I unplug it, at that point it shuts off again.
The loop goes like this: OnePlus white logo (normal when you boot), radioactive kernel loading, reboot and repeat. That happens, again, until I unplug it from the charger. Then it shuts off.
EDIT: If I try to get into bootloader instead (volume up + power), after about 8 seconds of me pressing the buttons the screen just shuts off and doesn't react to any more presses (even while plugged). If I unplug and replug it to the charger, I'm back to square one (low battery, please charge).
PC doesn't recognize it. It makes the "the battery is low" screen pop up, but nothing else.
Here's some phone information in case you need them.
Phone info:
Rom: NucleaRom 1.3 (+ Radioactive kernel which comes with it) got it from here
Xposed modules: Youtube Background Playback, AdAway
Root: Yes
Thanks in advance everyone.

I doubt it would be software related if it does it even when in bootloader. It could be the problem I had with my nexus 7 a few times. I needed to charge it like all day for it to even turn on. Either that or faulty phone/bad battery. I hope it's just dead

NUNsLAUGHTER92 said:
I doubt it would be software related if it does it even when in bootloader. It could be the problem I had with my nexus 7 a few times. I needed to charge it like all day for it to even turn on. Either that or faulty phone/bad battery. I hope it's just dead
Click to expand...
Click to collapse
Hello there, thanks for taking the time to reply. Yesterday I worked all day to try and make sense of the problem. I could have just bought another phone but I'm fairly attached to this one so I went deep.
I was fairly sure (like you) that it couldn't be a software problem, so I looked at the logic board of the phone; turns out (correct my poor technical wording) the bracket (connector?) for the battery on the logic board was coming off from the motherboard itself (the battery was indeed attached to the bracket, the bracket was just coming off of the board). What I did was just reposition the bracket and pushed it down with a bit of force on the board, then replugged the battery in the newly restored battery plug, and tried my luck. It booted! Back at its original 75%-ish.
My only guess would be that due to a fall the bracket got misplaced, but stayed close enough for it to still make contact and never actually shut down, until yesterday. That was... Quite an interesting ride.
Thanks for replying, it was indeed a "faulty phone", but I just couldn't leave it at that without trying

I'm glad it worked out for ya

Not work at all ...
My phone its show the logo on charging or low charge but its stuck for this for while full battary is empty... When I plagued in charger the same show charging logo with indicator but not charging its suck on that logo to .......then I charged the battary externally then put the battary try to open its show only a (powered by android log ) stuck on this ......I cant go any recovery modes ..fast boot mods... Only show this one or charging logo if battary low that logo to ... I try to get adb driver on my computer its also not show because of not get recovery modes ........
Any other idea to solve this

Z3 Death discharge problem

Welcome, i've readed alot of topics on the internet about problems similar to this, but nothing fixed my problem. I've tried connecting to wall/pc charger, power button + volume down/up combinations, really all the thing.
Couple days ago after my phone fully discharged ( I rarely had situation like this, I usually charge when my phone have 10-15%, but this day I couldn't. ) I came back home and tried to charge my phone, red light was ON but it still didn't charge after alot of hours. I then tried to fix it, turning on phone etc. but screen was always black and phone didn't want to charge. At first when I tried to boot the Z3 red light was blinking, but after some time it stopped. I ordered new battery, replaced it carefully (though it's battery problem) - then when I connected the new battery for the first time I though I have fixed the problem, battery charging icon showed up for a moment on screen, I was very happy. Then I disconnected charger so I could assemble my phone. Now when I try to charge my phone problem is this same.. like with old battery - Just red light, not turning ON, not blinking. Powering up Key combinations with volume don't fix it. My PC Companion don't see phone. I disassembled my phone again, disconnected battery and connected it - It didn't showed any battery icon again, so why it did when I connected it for the first time? and why when my phone died for the first time red light was blinking, now it doesn't? I want to add that I never dropped my phone or used it in water - never, thats why I was almost sure maybe just battery died after it discharged.
Btw. Important thing is that USB port isn't broken, red light is always ON when I plug USB charger, but when I try to use my magnetic charger, phone never respond - no light. I also tried different cables, chargers etc. Could it really be something with the mainboard?
What could've happen? Why my phone went dead after fully discharged it ? Why battery replacement doesn't fix the problem? I don't get it, is mainboard damaged or something? Can I still try something? Maybe anyone can help me.
Please :/ I cannot afford a new phone right now, really want to try fix it, maybe somehow connecting USB cable straight without usb port can fix it? I heared people do something like this.