G900V KLTE - BLACK SCREEN OF DEATH PHONE DIES UNEXPECTEDLY!!! (new battery)
Still having a problem with black screen of death. I had made a post about it earlier in the week but no response. I have kept everything basically the same, except I use Magisk 21.4-23 (newest), and TWRP 3.5.2 upgraded from 3.5.0 like maybe a couple months ago. Ever since last month have had the problem. I have brand new batteries installed as I thought maybe that was what was causing it (previous experience). Screen goes black, phone vibrates a couple times, then I have to battery pull to try to power on. Sometimes it works, other times it doesnt. In other instances have had screen freeze and get all static and soft reboot itself. I can see the white captive touch buttons working and sound but screen does not wake. Battery pulls for X amount of time does not solve the screen issue. I have flashed correct firmware several times in ODIN. I had this black screen issue and phone died while at the store earlier today. I need a phone thats dependable! This has been happening on any custom roms I use 14.1-18.1. I'm so frustrated I nearly broke my phone in half last night!
Any ideas what's causing the screen issue?
I had a very similar problem on my Galaxy S7. It used to suddenly shutdown, sometimes reboots by itself. Sometimes it won't just turn on at all except after some time.
Sometimes, it vibrates, shows the bootsplash for a few milliseconds, then shutdown.
What a coincidence that when I upgraded to TWRP 3.5, it was when the problem started to hit.
I was using crDroid based on R, It wasn't stable, so I thought the problem was the ROM/Kernel/Recovery. I tried an already known stable ROM.
The same thing happened, then I was semi sure that it is on hardware problem. I teared the device apart. The problem was .. Water Damage.
I thought the phone was water proof/resistant. What a disappointment. Anyway I've cleaned every molecules of water from the phone. It worked fine afterwards.
But I lost the battery percentage diode or something, so the phone can't read battery percentage/voltage.
It took me 3 months to know all these things. I hope it be of help to you.
Mohamedkam000 said:
I had a very similar problem on my Galaxy S7. It used to suddenly shutdown, sometimes reboots by itself. Sometimes it won't just turn on at all except after some time.
Sometimes, it vibrates, shows the bootsplash for a few milliseconds, then shutdown.
What a coincidence that when I upgraded to TWRP 3.5, it was when the problem started to hit.
I was using crDroid based on R, It wasn't stable, so I thought the problem was the ROM/Kernel/Recovery. I tried an already known stable ROM.
The same thing happened, then I was semi sure that it is on hardware problem. I teared the device apart. The problem was .. Water Damage.
I thought the phone was water proof/resistant. What a disappointment. Anyway I've cleaned every molecules of water from the phone. It worked fine afterwards.
But I lost the battery percentage diode or something, so the phone can't read battery percentage/voltage.
It took me 3 months to know all these things. I hope it be of help to you.
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So I did some more testing tonight. I first downgraded TWRP to 3.5.0 from 3.5.2 had same issues. Now i'm on 3.4.0, and I pounded on the display upside down while in recovery. It did the reboot thing and screen went black. Phone would not power up, even after removing and re-installing batteries. It has taken several tries with and without plugging it in. Finally it has booted up and I went into recovery to re-flash yet another rom. The phone would do the black screen thing at random and have issues if placed down too hard.
Obviously it's not software related it's hardware.
So my question is the display bad or the motherboard?
Should I just look into getting a 5G brand new phone or try to get it repaired somewhere?
I've been considering switching to T-mobile once I get a 5G device.
Droid9684 said:
So I did some more testing tonight. I first downgraded TWRP to 3.5.0 from 3.5.2 had same issues. Now i'm on 3.4.0, and I pounded on the display upside down while in recovery. It did the reboot thing and screen went black. Phone would not power up, even after removing and re-installing batteries. It has taken several tries with and without plugging it in. Finally it has booted up and I went into recovery to re-flash yet another rom. The phone would do the black screen thing at random and have issues if placed down too hard.
Obviously it's not software related it's hardware.
So my question is the display bad or the motherboard?
Should I just look into getting a 5G brand new phone or try to get it repaired somewhere?
I've been considering switching to T-mobile once I get a 5G device.
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Click to collapse
That's obviously water damage. I used to get all that on my old S7. It is fixable, you need to untie your motherboard, heat it till it literally dries up. Then it won't repeat that BSOD thing.
However, if you tried to boot the device while there's still some water, it will cause more damage to the components, diodes.
Galaxy S5 is for about 40$ in my country. You should consider buying another, more recent phone. Midrange 5G phones are for about 250$ - 400$ here. Though I still miss 2014 phones.
Mohamedkam000 said:
That's obviously water damage. I used to get all that on my old S7. It is fixable, you need to untie your motherboard, heat it till it literally dries up. Then it won't repeat that BSOD thing.
However, if you tried to boot the device while there's still some water, it will cause more damage to the components, diodes.
Galaxy S5 is for about 40$ in my country. You should consider buying another, more recent phone. Midrange 5G phones are for about 250$ - 400$ here. Though I still miss 2014 phones.
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I have no idea how to untie a motherboard or take apart my phone. I'm sure I'd end up doing more damage to it knowing my luck. I have no such tools either to take my phone apart. I've seen S5 for sale here in US for $50 or less and motherboards for a little less. Right now it's hard to afford a brand new 5G phone.
I'm not sure how my phone got water damage? I've always been careful with it over the years never submerged or anything.
Droid9684 said:
I have no idea how to untie a motherboard or take apart my phone. I'm sure I'd end up doing more damage to it knowing my luck. I have no such tools either to take my phone apart. I've seen S5 for sale here in US for $50 or less and motherboards for a little less. Right now it's hard to afford a brand new 5G phone.
I'm not sure how my phone got water damage? I've always been careful with it over the years never submerged or anything.
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Water Damage usually shows a few days up to a few weeks after it's interaction with water. I thought S7 was water resistant.
A tiny drop of water can cause this issue.
Don't know why people rush towards 5G phones, knowing it ain't stable just yet. I've heard USA is shutting down 2G/3G, so the least you should own is a Dual-VoLTE device. I got A70 for ~162$.
Mohamedkam000 said:
Water Damage usually shows a few days up to a few weeks after it's interaction with water. I thought S7 was water resistant.
A tiny drop of water can cause this issue.
Don't know why people rush towards 5G phones, knowing it ain't stable just yet. I've heard USA is shutting down 2G/3G, so the least you should own is a Dual-VoLTE device. I got A70 for ~162$.
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Yes 3G has been getting shutdown. 5G is still building out the network. If I were to stay with 4G I might as well stick with S5 since I know it and all my data is saved with titanium backup.
I have read to soak my phone in isopropyl alcohol for up to a couple hours. https://www.orduh.com/water-damaged-samsung-galaxy-s5/
It might be cheaper for me to just find another S5 right now. Can I restore backed up titanium data to a different phone?
I got this phone back in 2015 off eBay after my developer edition SD card slot was broken. Near the front camera it looked like some sort of damage may have occurred after I had received the phone. But I didn't have any of these problems other than a few years ago the BSOD once in awhile which went away.
Currently the BSOD issues have been since earlier this month/last month. As long as I don't put my phone down on table or hit it too hard it has no issue. If it's placed on table as gentle as a feather it's fine. But I have to do lot of battery pulls when I'm out doing errands walking with it.
And screen takes forever to wake when receiving phone calls sometimes I miss them. It's very delayed.
Droid9684 said:
Yes 3G has been getting shutdown. 5G is still building out the network. If I were to stay with 4G I might as well stick with S5 since I know it and all my data is saved with titanium backup.
I have read to soak my phone in isopropyl alcohol for up to a couple hours. https://www.orduh.com/water-damaged-samsung-galaxy-s5/
It might be cheaper for me to just find another S5 right now. Can I restore backed up titanium data to a different phone?
I got this phone back in 2015 off eBay after my developer edition SD card slot was broken. Near the front camera it looked like some sort of damage may have occurred after I had received the phone. But I didn't have any of these problems other than a few years ago the BSOD once in awhile which went away.
Currently the BSOD issues have been since earlier this month/last month. As long as I don't put my phone down on table or hit it too hard it has no issue. If it's placed on table as gentle as a feather it's fine. But I have to do lot of battery pulls when I'm out doing errands walking with it.
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So I looked at the water damage indicator sensor. My phone's patch is still white with a reddish x pattern, there is no water damage. If there was damage it would be all red.
There's no other explanation for BSOD the way you described except for damaged components, unless the phone was water damaged, it must have received a very hard hit.
That hit will definitely affect the screen, if the phone was refurbished, you won't notice it, cause the motherboard is connected to a good working device.
If you think it is software, there's bootloader, baseband, kernel, and system that you can change to confirm your thoughts.
It's very easy to untie S5, only needs one tool.
Mohamedkam000 said:
There's no other explanation for BSOD the way you described except for damaged components, unless the phone was water damaged, it must have received a very hard hit.
That hit will definitely affect the screen, if the phone was refurbished, you won't notice it, cause the motherboard is connected to a good working device.
If you think it is software, there's bootloader, baseband, kernel, and system that you can change to confirm your thoughts.
It's very easy to untie S5, only needs one tool.
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I know it's not software the bootloader, kernels, baseband have all been same and worked fine up until this month or so. I smacked the front of it while in recovery to see if it would have the issue. Sure enough it is hardware related! I just messaged a local repair shop on how much a fix would cost. I dont feel comfortable taking apart my phone and I dont have tools or anything.
Related
Something really weird happened to my O2 mini s. I just saw all the LED lights flash and then the phone vibrated and went blank. I did a soft reset it restart but then the same thing happened. I did a hard reset it was all ok, then when the O2 software began installing it did the same. Flashed all LEDs including the flash led vibrated and went blank. I though it was the battery. Changed the battery and it would refuse to wake up, just switch on all LEDs and keep vibrating. This kept happening for several times, and then suddenly all was ok. Re-installed an all, all is fine now. But I wonder what happened? And will it happen again? Any explanation by anyone would help. Thanks in advance.
This sounds like a hardware fault to me.
Can you think of ANY outside influences? Things like extreme temperature exposure, exposure to high humidity, or very fast changes of temperature or humidity could all cause shorts or low resistance conditions. I don't know that any of these historically lead to the type of fault you experienced specifically in Wizards, but from an electronics standpoint, anything of this nature could cause bizarre but temporary faults. Even dropping it could cause you problems of an unusual nature.
If the answer to any of the above (except dropping) was yes, do this:
Gather up all the desiccant you can find. This stuff can be found in bags of jerky, and in just about any electronics box ever packed. Sometimes I find little "jars" of desiccant in medicine bottles (long-acting antacids, in particular). Put the phone in a plastic zip-top bag in a warm, dry place with all of the desiccant inside and seal it up tight. Leave it for at least 12 hours, but 24 would be better. Throw away the desiccant when you're done.
If you can't come up with an outside cause for the fault, you may just have to chalk it up to the age of these phones. They are far from new. Even if you just bought yours, chances are good that it is refurbished, and electronics, like fruit, will go bad eventually.
Thought so...
Thanks for your detailed reply. I think the temperature would be the reason. I am in India and that too in the Southern part and its been awfully hot these last few days (40 deg. C or more) yesterday I was in my room and had switched on the air conditioning, the phone was near the ac for a while. Then I did switch off the ac, probably this fluctuation caused to form moisture? It was behaving weird but its ok for the time being... for the last 12 hrs or so. I am waiting for 3G services in India before I decide on my new phone, so I hope this lasts for another 6 months. Hope! Thanks again, will try your method if this happens again.
The problem is back and won't go away. Should I bury my phone? Or is there hope? Any help would be appreciated. Thanks in advance.
If dessication didn't work, you can also try swapping batteries with someone (best to do this while the problem is presenting itself).
You can also try doing a hard reset as a last resort (remember to backup your PIM info!), but I doubt this will do you any good. However, it doesn't cost you anything, and is therefore worth a try.
See if your service carrier offers insurance on your phone. If they do, sign up, and turn it in a week later for replacement. Just remember to wipe out your personal data and remove any HardSPL/Unlocks you might have done.
If insurance fraud is distasteful to you, hit eBay. You can usually score a decent condition Wizard for around $120 USD.
I haven't really tried dessication, but I think its gone beyond that. Batteris I have 3 and none of them worked. Is it easy to open the phone and try and "air" it? Will that help. Unfortunately carriers in this country don't have insurance plans. So that leaves out that last option. And if I have to buy another phone then why... the same one... ;-) Thanks anyways..
Thought I'd share my story. I recently got a swap out for a "dusty" screen. My new phone seemed OK. A few days passed by and my camera flash started acting up and not working... Today I woke up and NOTHING on the top half of my phone works. Meaning my ear peice, my 3.5mm jack, my camera, or flash, or proximity/light sensors... nothing. But the speakerphone works, my screen is fine. and my microphone works. kinda odd!
It almost like the top PC board got disconnected internally or something.
Just thought this was a strange issue. Already requested yet ANOTHER swap from HTC. Hopefully this next one can make me beleive this phone was worth it.
On another note. I did get my phone "ghost armored" at a cart in the mall pretty much immediately upon receiving it from fedex. And they do spray a small amount of soapy liquid on the outside of the phone to apply the skins. Do you think this could be enough to cause water damage? I'm afraid HTC is going to charge me for "non warranty problems" if the guys at ghost armor caused this! Its a very "fine mist" they use so I think it would be hard to penetrate the phones seals. But who knows? Whats your opinion?
dills84 said:
Thought I'd share my story. I recently got a swap out for a "dusty" screen. My new phone seemed OK. A few days passed by and my camera flash started acting up and not working... Today I woke up and NOTHING on the top half of my phone works. Meaning my ear peice, my 3.5mm jack, my camera, or flash, or proximity/light sensors... nothing. But the speakerphone works, my screen is fine. and my microphone works. kinda odd!
It almost like the top PC board got disconnected internally or something.
Just thought this was a strange issue. Already requested yet ANOTHER swap from HTC. Hopefully this next one can make me beleive this phone was worth it.
On another note. I did get my phone "ghost armored" at a cart in the mall pretty much immediately upon receiving it from fedex. And they do spray a small amount of soapy liquid on the outside of the phone to apply the skins. Do you think this could be enough to cause water damage? I'm afraid HTC is going to charge me for "non warranty problems" if the guys at ghost armor caused this! Its a very "fine mist" they use so I think it would be hard to penetrate the phones seals. But who knows? Whats your opinion?
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water can literally penetrate the smallest most microscopic points. but i dont know think "mist" could do any harm. i think it sucks that you're having bad luck with all these though man.
I like straweberries, they taste good. When eaten slightly chilled they are refreshing as well. And the things you can do with them... fresh fruit topping for cereal, pancakes, yogurt, or you can make them into jam/jelly/compo(sp?)
Anyways, yes, it is possible for your device to have received water damage, this is why I have not and will never put something on my phone that requires the use of water in the application process. And it might even be probable given that on the top of the phone you have a 3.5mm jack, speaker housing, and when you take the back off this gets exposed... and I am guessing they removed the back before misting it, so even more water can get into that area causing major issues.
pjcforpres said:
I like straweberries, they taste good. When eaten slightly chilled they are refreshing as well. And the things you can do with them... fresh fruit topping for cereal, pancakes, yogurt, or you can make them into jam/jelly/compo(sp?)
Anyways, yes, it is possible for your device to have received water damage, this is why I have not and will never put something on my phone that requires the use of water in the application process. And it might even be probable given that on the top of the phone you have a 3.5mm jack, speaker housing, and when you take the back off this gets exposed... and I am guessing they removed the back before misting it, so even more water can get into that area causing major issues.
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Haha, thanks for your opinion on strawberrys.
I believe they remove the battery, but put the battery cover back on before misting. They also leave the device off while they do this and tell you to leave it off for an additional 2 hours (i left mine off for 6 or 7 hours.)
Even leaving it off, if water gets it, it gets in, and starts causing the circuits and what not to corrode.
I will say, I think it is highly unlikely that you do have water damage causing this problem. If HTC says no go, water damage, those misty dudes are responsible and liable to replace your device/pay for repairs. But, I do highly doubt it.
Still, there is a chance of there being water damage, and even if it isn't causing the problem, HTC won't care.
All in all, I would put money that the swap goes just fine, and hopefull 3rd time is the charm for you. It seems some people, no offense, just have really bad luck with these, while others (not to brag), have bought 5 of them without a single problem.
pjcforpres said:
Even leaving it off, if water gets it, it gets in, and starts causing the circuits and what not to corrode.
I will say, I think it is highly unlikely that you do have water damage causing this problem. If HTC says no go, water damage, those misty dudes are responsible and liable to replace your device/pay for repairs. But, I do highly doubt it.
Still, there is a chance of there being water damage, and even if it isn't causing the problem, HTC won't care.
All in all, I would put money that the swap goes just fine, and hopefull 3rd time is the charm for you. It seems some people, no offense, just have really bad luck with these, while others (not to brag), have bought 5 of them without a single problem.
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5 of them?! jeez!
I agree, I'm having really bad luck. I LOVE this phone. Its just getting annoying having to swap it out every other week.
I'm also angry that this broken one has the best screen I've seen on any nexus, no dust, no pink tint. its perfect! and i have to return it
Oh well. thanks for the advice. I feel a little better about the swap now, I cant really afford to lose another 530$.
One for me, and 4 others for friends that had me help them buy one...
I bought this phone, used, earlier this week. It was on the official GB update. So I downgraded to 2.2 and did the whole permroot and s-off procedure and loaded MIUI on it, which has been splendid the past few days.
But now the phone won't turn on. I replaced the beat screen protector with a new one from ebay, stealth shieldz from Prestige Solutions. It is a liquid solution screen protector. Anyway, I always turned my phones off prior to installation, keeping the battery in. I have never had a problem. But now with my MT4G, it won't turn on. It did turn on by accident and I pulled the battery out until I was finished with installation. Now it won't turn on.
I've read of bad emm (or whatever it is) chips. I read multiple solutions before posting. But what makes mine a different case is that the phone flashes black everytime I push the power button, or when I plug in the charger, sometimes staying black until I pull it out. I don't see any orange leds that indicate the phone may be bricked. Though, at this point, this case seems worse.
Any idea what the issue may be?
http://www.youtube.com/watch?v=L4RzxshjabM
Sounds bricked to me. Call HTC and possibly get a replacement for the bad eMMC chip.
It's funny. I went to the tmo store and they told me it was water damaged, using another battery. Plus, they said the water damage indicator on the phone was peeled off. So I go home and file an insurance claim. I now am expecting the refurbished replacement tomorrow.
Tell me why after I make the claim, like right after, the phone starts working? I don't regret making the claim because $130 for factory refurbished beats $180 and up for unknown Craigslist. And this phone is still water damaged and can die at any given moment. Already turned off once.
I am having a similar issue after a 2 foot drop of the phone. No physical damage on the outside but not sure about the internals. is there a way to start troubleshooting this issue and seeing what i can do to repair? I am so lost right now since this is the first major issue I have had iwth this phone. Since I can not get a screen and the boot into recovery via volume down and power is not working I am not sure what ican do.
It is most likely bricked. same thing happened to my girls. She dropped it and bricked..mine just bricked last week out of nowhere to....got replacement now....both had bad hips...new ones has good chip but bad screen
Sent from my HTC Glacier using XDA App
Had a bootloop today on my phone lgg6 Australian version. It was charging and over heated then would go to the LG logo and keep rebooting then it went to a yellowish screen with a whole heap of code about the battery. I pulled the phone appart to see if I could find anything wrong. And to my astonishment the heatsink paste was dried up and powdered. Cleaned it up replaced the thermal paste put it back together and works great. Also noticed doesn't get as got especially when charging. Hopefully this doesn't happen to anyone else. I noticed also in the last two weeks it's been sluggish and dozer a few times also rebooted once.
Any proof?Any pictures/videos about that?I just can't believe in this-
"heatsink paste was dried up and powdered,Cleaned it up replaced the thermal paste put it back together and works great".Looks like a bull**** for me,honestly.
Um your a moron why would I say it do ****
This is what happened
Then it bootlooped. Seriously I was trying to be helpful. Some people.
I'm not saying you're a troll,i just wanted to see a proof of that,ok?And that means i am a moron?
We'll learn to try not to be insulting.
And I didn't get any pictures of the heat sink paste but it was a pink powdery substance that wiped off when I touched it. Haven't had a good run with phones lately my Nexus 6p bootlooped and can't be repaired and now my lgg6 did and could be which I thought was pretty awesome. Considering the last LG phone I owned was a lgg2 which was pretty easy to work on also. I won't be buying another Huawei phone ever again that's for sure. I have owned every Nexus since the first one and they have all been great for what they are. I wouldn't mind buying a LG v30 as I didn't realise I couldn't unlock the bootloader when I bought this.
Hi
Just to say that same issue just happened couple of minutes ago... I didn't know G6 could run this bootloop problem. I had this issue with my old G4, now the G6...
I think I'll say ciao to LG even if I really like their product!
The phone is almost a year old now. Have you ever heard of a bootloop case? I'm pretty sure if there were problems like G3/G4 had, we'd knew already. Fortunately, the g6 is a sturdy device, both software and hardware, and it takes a lot of heavy usage every day. Not to mention flashing and testing custom roms almost daily,
This happened to my phone out of the blue last night. Kept on alternating between black screen and the lg logo. Did the reset, power button and volume down but that just gave me the same yellow screen. Charged in I could get the looping, unplugged with would just go black then back to yellow if I tried to reset or selected reboot. Then it just went dead despite having approx 50% battery. Unfortunately I bought it from eglobal about 10 months ago so I'm not holding out much hope for a successful warranty claim.
Thanks for the info above, there seems to be very little about this issue out there so at least I hae something to try.
Apologize if this is the wrong forum as most threads I've seen on here are usually software related, but wanted some technical input.
Goal Get a working phone again for the cheapest price, bonus points if I learn something along the way, am okay with accepting the risk of ruining my 'broken phone' even more.
Samsung S7 Edge DUOS broke (no response to charging, no LEDs or lights at all) while traveling in Europe. Took it to a Samsung Paris service center and they said they were pretty sure it was a motherboard problem and I would need to send it back to Asia to fix it, especially since it was DUOS.
I'm probably going to order up a new motherboard myself and attempt a DIY repair, partially to save money, but also for enthusiast purposes. No experience with my phone, but tinkered with computer hardware before (delidding Intel CPU for overclocking purposes and did minor case modding).
1) I see different motherboard models such as for Verizon, AT&T, etc. But the physical specs of all of them seem very similar (minus the DUOS), does that mean I can buy a non-DUOS board for my phone bezel/case/camera? I got it originally from my brother and have no interest in dual-sim capabilities at all. If it means I can get another similar performing board with domestic US shipping (most used DUOS boards on Ebay/AliExpress ship internationally), I would rather prefer that.
2) Anything I can do to make sure it isn't a motherboard problem? Given the backstory and only 2-3 minutes of testing in the back (not sure how long it would take a technician to hook it up to a multimeter), the service center rep said he was pretty confident it's a motherboard issue.
3) Anything I should look out for? Make sure the motherboard doesn't have a blacklisted IMEI? I'm actually a bit unfamiliar with phone hardware, are the drives, RAM, etc. all complete with the motherboard? Or are those externally hooked up elsewhere in the phone? The prices of the motherboard complete set seem to be pretty cheap to me ($60-$100 range).
Backstory
Received it from my brother who bought it in the Philippines. The most physical damage it's ever taken was slipping out of my pocket while sitting and hitting a hardwood floor, phone worked fine for months. While driving one hot day, my phone just died while using the GPS, last I checked it was about 70% battery, and then the screen turned black and got very hot. After some googling, I waited for the phone's battery to die before charging it back up, and sometimes made it to my home screen/photo gallery, and other times got stuck in a boot loop. It would still have a blue LED indicator on the front, while being hot, and could boot the phone up in recovery mode. Although it kept giving me partition not found errors.
Did a factory reset and for some reason it miraculously worked. Re-downloaded apps as I needed them and phone seemed to work just like new again. Then 2 weeks later on the plane way to Europe, was using an GBA emulator for an hour or so, before closing the phone to sleep. Woke up to the phone very hot to the touch, non-responsive, no LED's, figured I would try waiting for the battery to die down before plugging it in again - no luck.
1.
I swapped a Duos Mainboard in a Non-Duos Display, there was no Problem at all, i think you are fine with buying a normal board, only internally the Card Slot has more Pins, but the Card Caddy is the same.
2. It surely is the board, if the phone gets really hot, it's not the battery. And a broken Display would also not make a phone get very hot out of nowhere. And yes, the whole computing stuff is soldered on the Motherboard, CPU, RAM, Modem, Controllers, IC, almost everything. So if it's not a short in the USB-Port, it is the Motherboard in my opinion.
3. I dont know anything About blacklisted IMEIs in Europe. Maybe you should look, that the board is not Google/Samsung locked.
Btw, you dont Need to wait until the battery runs down, it's also not very good for your Display and battery if the phone is so hot over a Long period of time. Simply hold Power+Home+Volume Down to do a hard reset, which should Always work.
Sorry for my bad englisch!