Develop Bugs

Boot loop. Can't access download or recovery mode.

Hello all,
I'm got an I747 that one day just decided to stop working on me. I was running stock rooted firmware and have never tried custom roms.
The phone repeatedly tries to boot up and then shut down. I can't ever get pass the Samsung logo.
The same thing happens when trying to access recovery or download mode. I see the initial download/recovery screen and then the phone shuts off.
Is the motherboard toast?
My friend has an I747 as well but it has been blacklisted. Are there any parts I can swap from one another to get either one of them working?
Any help or input is appreciated.

r i c h said:
Hello all,
I'm got an I747 that one day just decided to stop working on me. I was running stock rooted firmware and have never tried custom roms.
The phone repeatedly tries to boot up and then shut down. I can't ever get pass the Samsung logo.
The same thing happens when trying to access recovery or download mode. I see the initial download/recovery screen and then the phone shuts off.
Is the motherboard toast?
My friend has an I747 as well but it has been blacklisted. Are there any parts I can swap from one another to get either one of them working?
Any help or input is appreciated.
Click to expand...
Click to collapse
Does removing & reinserting the battery (with no buttons pushed) trigger the restart behavior?

pc103 said:
Does removing & reinserting the battery (with no buttons pushed) trigger the restart behavior?
Click to expand...
Click to collapse
Yes, just by inserting the battery the phone vibrates and begins to start up.
Once the Samsung logo appears it turns back off again.

r i c h said:
Yes, just by inserting the battery the phone vibrates and begins to start up.
Once the Samsung logo appears it turns back off again.
Click to expand...
Click to collapse
Indicates Samsung stuck power button syndrome. A lot has been posted about this.
I would start with warranty service if available.
If not, search a lot & choose solutions carefully.
It happened once with my Captivate & teardown & blowout cured it,
though I never observed the physical defect (only the symptoms).
I have used apps to reduce my use of the button ever since, with GS2 & GS3.
Approach teardown with extreme caution if you are not experienced.
Gently tapping a table edge with the upper right has worked for some.

pc103 said:
Indicates Samsung stuck power button syndrome. A lot has been posted about this.
I would start with warranty service if available.
If not, search a lot & choose solutions carefully.
It happened once with my Captivate & teardown & blowout cured it,
though I never observed the physical defect (only the symptoms).
I have used apps to reduce my use of the button ever since, with GS2 & GS3.
Approach teardown with extreme caution if you are not experienced.
Gently tapping a table edge with the upper right has worked for some.
Click to expand...
Click to collapse
Thanks for the advice. I did not know this was a common problem.
Unfortunately I am out of warranty so I will try to fix this myself.
I have already taken apart the phone before so I am fine with tearing it down again.
What do you mean by blowout? Do I physically try to tap the power button of the mother board on a table edge?

r i c h said:
Thanks for the advice. I did not know this was a common problem.
Unfortunately I am out of warranty so I will try to fix this myself.
I have already taken apart the phone before so I am fine with tearing it down again.
What do you mean by blowout? Do I physically try to tap the power button of the mother board on a table edge?
Click to expand...
Click to collapse
Push out any dust or debris outward using forced dry air.
The gentle tapping of the button edge area is a pre-disassembly alternative.
Many opinions, experiences & videos have been posted. It's worth it to sample some first.

[Q] SPH-L710 reboots in recovery Battery, power button issues possible

I have read the other posts regarding the rebooting issues of the Sprint Galaxy S3 variant, but I seem to have a touch more difficult problem. My phone constantly resets and seems to be getting worse. It now will reset in the middle of recovery. I was able to wipe the cache and dalvik and then it started resetting even more frequently in recovery and made reloading the rom impossible. It even resets in the download screen. So it makes it impossible to use Odin and other applications. If anyone has any ideas let me know. I have a few possible options that I am pondering. The following is what led up to this if you need some background:
A week ago, I noticed that my battery suddenly was not charging when wifi was on. I turned it off thinking it was some glitch and reset the phone and plugged it in to charge. It said it was at 100 % some hours later. then I turned it back on again and within a couple minutes, it said it was at 22%. So I hard reset and then plugged it into the wall, but it was still not charging. I had go somewhere,so I plugged it into the car charger and enabled fast charge. I turned on my data and all the sudden it rebooted, lost my wifi password, but when it came back on, it was charging properly. So I thought it was just some odd glitch. Charged properly for days.
Then I noticed the phone starting to randomly reset maybe once very other day when texting. I was actually going to put on a new rom tomorrow thinking maybe my old one had become corrupt. Then it suddenly increased drastically tonight to where it was starting to reset constantly. I thought maybe the button was stuck, and pulled off my otter case to make sure it wasnt being pressed down oddly, but it continued. Then I went into recovery and was able to wipe the cache and dalvik before it got really bad and now it won't even let me stay in recovery for any length of time. I almost got a rom loaded when it reset and its been resetting faster than ever. Becoming unresponsive to button presses as well. Even when I could get into the recovery, it would keep showing "swipe screen to open," as the power button was apparently continuing to activate or the phone was trying to reset itself. And yes, I have tried a battery pull several times and then tried to get into recovery, only to be booted out right as I see the recovery screen if I get there.
So that is my problem. I can't flash odin or anything else as the phone just keeps resetting. Part of me thinks to get a new battery and try to see if that doesn't solve my issue, as maybe the battery is causing the phone to reset? But part me is also thinking maybe the power button has gone sticky suddenly? It won't charge it seems as the red light will not come on and it keeps resetting before the battery charging icon can even come up. Any help or advice would be appreciated. I am leaning towards the battery going bad suddenly and shorting out the phone. I now have the battery, which last I saw was at 48% (It was charging when this happened), out of the phone and am waiting till morning to hopefully pick up a new battery. But I would appreciate any insights into this issue.
Thank you very much

Same issue
I'm having the same issue described above with the S3 constantly rebooting. I can get into download mode but it restarts a few seconds into the flash. I have tried a different battery but that did not solve the problem - I am also thinking it's a power button issue... any suggestions?

mawamd said:
I'm having the same issue described above with the S3 constantly rebooting. I can get into download mode but it restarts a few seconds into the flash. I have tried a different battery but that did not solve the problem - I am also thinking it's a power button issue... any suggestions?
Click to expand...
Click to collapse
I just had my phone replaced for same reason ( Thank god for insurance) Download mode would last about 5 seconds, Recovery would do the same. I managed to get a stock restore with flash counter reset to boot as i was walking into the Sprint store for the techs to look at this lol.. Same exact thing happened on my S2. Power button is done. If you have INS call and get it replaced (Took me about a week for new phone)

I read some post on possibly using Samsung Kies to flash a new ROM, but that was for the international version. I would be curious if anyone has ever tried this or if its possible to replace the power button with a part replacement? I have ordered an S4 but this time I will make sure to use the home and left touch pad more often to unlock the phone and save wear on the power button. I wold still be interested f anyone has found a fix for this.

mawamd said:
I'm having the same issue described above with the S3 constantly rebooting. I can get into download mode but it restarts a few seconds into the flash. I have tried a different battery but that did not solve the problem - I am also thinking it's a power button issue... any suggestions?
Click to expand...
Click to collapse
So after looking around, I am pretty convinced this the power button,as people describe on this question. If you don't have insurance, I see there are selling replacements or you can pay someone to replace and fix the power button fairly affordably on ebay. I might go the second route, as I want it fine right and the man had a 100 percent rating positive, and I dont really know what I am doing lol. Thanks everyone for your answers.

[Q] Samsung Ace II will not turn on

Hello, new here and I know nothing about rooting nor have I rooted my phone but after looking all over the net I have come here in hopes of finding some tech wizards that can help me.
The Problem:
Turned phone off and a few hours later I tried turning it back on but it only shows the screen with model number and Samsung under it. It shows for a few seconds then the screen goes black and keeps looping like this. I have not rooted or anything. Not dropped in water ( water square is pink though). Phone shows no water damage or corrosion after opening.
What have I done?
I tried booting in recovery and download mode but i have never done it before and I was not successful at getting any other screen besides the model number Samsung screen.
I have tried a different battery after spending some time at the mall (no on carries it any more as it is no longer made) different battery did nothing. Repair guys suggested it may be the button sticking and said hey could clean it for $25. Instead I went home searched the web and disassembled my phone. I cleaned the button areas on the inside of the case and the contact on the inside attached to the circuit board. I have reassembled and it still does the same thing.
After more research I found a video saying to actually remove the internal button from the circuit board to stop the loop (which will leave me with no power button) I have not tried this as I am not that bold (yet).
I am wondering if it is a software problem that can be fixed by using Odin and installing the stock firmware but I just have not found a proper guide that makes enough sense for me to actually try. I don't want to waste my time with something I have never done and make things worse.
I have downloaded Odin and firmware from sammobile but that is about as far as I can go without some hand holding....
Thanks for reading my story any help would be much appreciated.

Fishheadman said:
Hello, new here and I know nothing about rooting nor have I rooted my phone but after looking all over the net I have come here in hopes of finding some tech wizards that can help me.
The Problem:
Turned phone off and a few hours later I tried turning it back on but it only shows the screen with model number and Samsung under it. It shows for a few seconds then the screen goes black and keeps looping like this. I have not rooted or anything. Not dropped in water ( water square is pink though). Phone shows no water damage or corrosion after opening.
What have I done?
I tried booting in recovery and download mode but i have never done it before and I was not successful at getting any other screen besides the model number Samsung screen.
I have tried a different battery after spending some time at the mall (no on carries it any more as it is no longer made) different battery did nothing. Repair guys suggested it may be the button sticking and said hey could clean it for $25. Instead I went home searched the web and disassembled my phone. I cleaned the button areas on the inside of the case and the contact on the inside attached to the circuit board. I have reassembled and it still does the same thing.
After more research I found a video saying to actually remove the internal button from the circuit board to stop the loop (which will leave me with no power button) I have not tried this as I am not that bold (yet).
I am wondering if it is a software problem that can be fixed by using Odin and installing the stock firmware but I just have not found a proper guide that makes enough sense for me to actually try. I don't want to waste my time with something I have never done and make things worse.
I have downloaded Odin and firmware from sammobile but that is about as far as I can go without some hand holding....
Thanks for reading my story any help would be much appreciated.
Click to expand...
Click to collapse
Try this - Press and hold Volume up + Home + Power buttons together a few seconds, you should get recovery mode. And then find factory reset.

garak elim said:
Try this - Press and hold Volume up + Home + Power buttons together a few seconds, you should get recovery mode. And then find factory reset.
Click to expand...
Click to collapse
Thanks for the reply. I have tried this many times and tried again after reading your reply. This should work fairly fast from what I understand right?
My phone is a virgin mobile phone (Canada) is it possible they have locked out recovery / download modes?
When I try to start in recovery nothing happens at all. Screen does not light, phone does not vibrate. Again I have never tried this until now so I don't know if the phone ever booted into these special modes when it was working.

Fishheadman said:
Thanks for the reply. I have tried this many times and tried again after reading your reply. This should work fairly fast from what I understand right?
My phone is a virgin mobile phone (Canada) is it possible they have locked out recovery / download modes?
When I try to start in recovery nothing happens at all. Screen does not light, phone does not vibrate. Again I have never tried this until now so I don't know if the phone ever booted into these special modes when it was working.
Click to expand...
Click to collapse
It's weird. I found something on page hard-reset.com. I cannot post link here now. I put "samsung ace2 recovery" into google and it was on first page. It's hard reset key combination. Try it.

When you plug the phone into the charger, do you get the battery charging status screen?

garak elim said:
It's weird. I found something on page hard-reset.com. I cannot post link here now. I put "samsung ace2 recovery" into google and it was on first page. It's hard reset key combination. Try it.
Click to expand...
Click to collapse
Forget my previous post. I was wrong. I try find another solutions.
Is your battery fully charged?

Is my 1+3 dead!?

Hi everyone,
I'm experiencing pretty silly situation with my phone.
So the story begins here:
I was surfing the web while listening to music in the bus when suddenly my oneplus3 randomly turned off and I couldn't turn it back on. (I was on something around 15% on battery so it's not a low battery problem) I tried to turn it on several times and after holding the power button for like 10secs it turned on, and after pressing the power button again (because I needed to get past unlocked bootloader screen and dm-verity) I saw a boot screen. The capacitive button leds turned on and after 3 secs it turned off again, so I started worrying... After a while I tried to access the recovery, but no luck at all. It powers it self off after bootscreen. So I started to research. Tried to flash the entire OS, partritions with msmdownload tool. After several unsuccessful flashes (firehosewritedata failed sometimes while writing userimg or system.img or boot.img) I did get the download complete green text message, and after successful flash, the white LED turned on, even the phone was not plugged in USB or charger and turned off. The screen is completely black and the white led just flashes constantly without blinking or anything. I could only turn the led off by pressing the power button for another 10 secs. And after turning the phone off, problem still remains. After oneplus logo phone shuts down...
I can access bootloader.
And after flashing everything should be on stock, because now I only got screen only about bootloader, no dm-verity..
And of course - I still cannot access the recovery.
p.s. I tried to do the power cycle (as the tech support told me) but still no luck at all.

did u tried the full msmdownload tool (1gb) or the 55mb version ?

Mukthar. said:
did u tried the full msmdownload tool (1gb) or the 55mb version ?
Click to expand...
Click to collapse
1GB version

djemm1996 said:
1GB version
Click to expand...
Click to collapse
Are you sure that you did it right? Did your phone show up as mentioned in the instructions?

Puddi_Puddin said:
Are you sure that you did it right? Did your phone show up as mentioned in the instructions?
Click to expand...
Click to collapse
Of course. Everything is done right. I also get that green "download complete" message.
p.s I also opened the phone. water indicators are fine and no major defects what can i see by eye... All connectors are good as well.

Puddi_Puddin said:
Are you sure that you did it right? Did your phone show up as mentioned in the instructions?
Click to expand...
Click to collapse
And yes, phone was connected right. :good: installed drivers with test mode on Win10 and got Snapdragon device in COM devices. As well the MsmDownload tool shows up my device in port #20

Any ideas?

djemm1996 said:
Any ideas?
Click to expand...
Click to collapse
Follow method 2 from the Hard Brick guide by Naman Bhalla and try two or three times.
Sometimes it takes more than once for restoration.

Since you opened the phone, i think your warranty is gone now.
If the msmdownloadtool didnt help you, there is nothing you can do i think.

try to flash again, and if it still maybe something short inside.
if you have disassembly your phone, try disconnecting various flex cable like camera, sim slot etc that connect to the mainboard, that doesn't prevent device from powered on, then try to turning it on.
if it still, check your mainboard, if you don't know how, send it back.

AcidNoteZ said:
Since you opened the phone, i think your warranty is gone now.
If the msmdownloadtool didnt help you, there is nothing you can do i think.
Click to expand...
Click to collapse
Is ir really gone? There is a still warranty void sticker on the screw there, but of course it's possible to see by eye that the phone has been opened.
I have an appointment with Level2 tech support @oneplus, they are going to remotely flash the entire OS, but do you think they are using pretty similar technique as the msmdownloadtool?

djemm1996 said:
Is ir really gone? There is a still warranty void sticker on the screw there, but of course it's possible to see by eye that the phone has been opened.
I have an appointment with Level2 tech support @oneplus, they are going to remotely flash the entire OS, but do you think they are using pretty similar technique as the msmdownloadtool?
Click to expand...
Click to collapse
They are doing the same thing like you did.
I already had a session since i thought they are going to do something "special"
You can try the remote session but im afraid that wont help you if you already did it multiple times.

What about battery? Charged?

drmuruga said:
What about battery? Charged?
Click to expand...
Click to collapse
Yes battery is charged of course. It's just doint the same thing. Turns on, after a while when bootscreen comes it just turns off and white notification led appears, after that nothing.

I tried to flash it with tool using method 2 for like 15 times with "download complete" messages, but still no luck at all. Tried to erase partritions with fastboot, flashing just only recovery, modded recovery etc. but I still cannot access the recovery nor system. I just don't get it why the phone does not boot into recovery if I flash it or boot it straight away, It just only turns off and that's it. nothing more. Only black screen and white led lighting all the time (after a while the phone turns warm).
I have read all the MsmDownloadTool thread in "Mega Unbrick thread" and saw that few people have experienced the very same situation as me, so I was wondering if there is any fix for this? It's so strange that I was just surfing the Web and it just turned off by it self with like static image for miliseconds and after that just black screen.
There should be any fix. I guess that it's just a partition error...

Ok, not good news. I had a little remote session before a while. They says it's already a hardware problem.

AcidNoteZ said:
Since you opened the phone, i think your warranty is gone now.
If the msmdownloadtool didnt help you, there is nothing you can do i think.
Click to expand...
Click to collapse
Pfffft you think manufacturers notice when you take apart phones? Hell I took apart my Xperia Z2 because it was having problems and then glued it back together with cyanoacrylate hahahaha (worst thing to do but wtv) and no one noticed though it was seemless and everything looked perfect

Guys, I've got something for you! Not really the same thing as Naman.
p.s. not saying its original hehehehe keep safe

man i got a very similiar problem but my op3 has a black screen i was also on low battery around 5-15% when my phone went off after i was in twrp

Actually I was on twrp too! Also I have recently noticed that recovery loading speed was far too long than normal one. I'm talking for something about 5-7 minutes after reboot into twrp. So, who knows what did happen. Just made an RMA request. Will see how it goes.
Anyway, I was on stock 7.1.1 and it's just rooted with custom recovery and that's it! Nothing more! Is that just a factory failure or maybe it's caused by drops i have had? Nothing serious for a 4-5 times for a half year. Of course I have used it even in winter when the snowflakes are coming down from the sky and little rain. Btw, these liquid indicators are white, so all safe. ::laugh:
A
makadama said:
man i got a very similiar problem but my op3 has a black screen i was also on low battery around 5-15% when my phone went off after i was in twrp
Click to expand...
Click to collapse

[Need Help] G960F not charging, But OTG Works.

Hi,
My Galaxy S9 (Exynos) just stopped charging today. It had no problem this morning, but when I tried recharging in the evening, it won't charge at all. Connecting it to PC won't work either. But OTG works just fine. I am wondering if it is a hardware or software problem.
I unfortunately do not own a wireless charger so its almost dead now. If I could confirm it's a hardware problem, I would just buy another charging board but I would like to confirm it first before buying. Is this a common problem in s9? Could there be any issue on the software level?
Any help is appreciated. Thank you.

seijidinzuala said:
Hi,
My Galaxy S9 (Exynos) just stopped charging today. It had no problem this morning, but when I tried recharging in the evening, it won't charge at all. Connecting it to PC won't work either. But OTG works just fine. I am wondering if it is a hardware or software problem.
I unfortunately do not own a wireless charger so its almost dead now. If I could confirm it's a hardware problem, I would just buy another charging board but I would like to confirm it first before buying. Is this a common problem in s9? Could there be any issue on the software level?
Any help is appreciated. Thank you.
Click to expand...
Click to collapse
the only things that come to mind that could cause this is the board being bad or the kernel being corrupt. If you can OTG, you should be able to Odin with it (key word there is should), if you can Odin with it, just flash the HOME_CSC firmware files and if it charges afterwards, then you know it was the kernel. If it still doesnt work, bad charging port/card

Thank you for your response, but as I have said, my PC cannot charge it or even detect it at all. OTG is the only thing that works. Maybe the phone is blocking any data transfer when power come along on the usb port? Am I making any sense?

seijidinzuala said:
Thank you for your response, but as I have said, my PC cannot charge it or even detect it at all. OTG is the only thing that works. Maybe the phone is blocking any data transfer when power come along on the usb port? Am I making any sense?
Click to expand...
Click to collapse
you are making sense, but if the OTG works, then data transfer should be working too. Can you boot to DL mode?

youdoofus said:
the only things that come to mind that could cause this is the board being bad or the kernel being corrupt. If you can OTG, you should be able to Odin with it (key word there is should), if you can Odin with it, just flash the HOME_CSC firmware files and if it charges afterwards, then you know it was the kernel. If it still doesnt work, bad charging port/card
Click to expand...
Click to collapse
youdoofus said:
you are making sense, but if the OTG works, then data transfer should be working too. Can you boot to DL mode?
Click to expand...
Click to collapse
Yes I can boot to dl mode and recovery too. When I connect it to PC, the PC don't even make any sound (you know that usb connect sound).

youdoofus said:
you are making sense, but if the OTG works, then data transfer should be working too. Can you boot to DL mode?
Click to expand...
Click to collapse
I tried going to dl mode again and noticed that I can only boot to the warning screen, and then the volume button stops functioning there. Volume buttons works normally in recovery and OS. And also, I borrowed my friend's wireless charger and it was able to charge just fine with it.

youdoofus said:
you are making sense, but if the OTG works, then data transfer should be working too. Can you boot to DL mode?
Click to expand...
Click to collapse
I apologise for quoting you again and again, but I just wanted to update you that my Bixby button was stuck which made the volume buttons not working in the warning screen. I tore down the phone, fixed the bixby button and now I can boot to dl mode. And good news, Odin can detect the phone in dl mode. I will flash as you suggested and report back. Thanks a ton

seijidinzuala said:
I apologise for quoting you again and again, but I just wanted to update you that my Bixby button was stuck which made the volume buttons not working in the warning screen. I tore down the phone, fixed the bixby button and now I can boot to dl mode. And good news, Odin can detect the phone in dl mode. I will flash as you suggested and report back. Thanks a ton
Click to expand...
Click to collapse
youre most welcome! im glad you found the culprit because i wouldnt have ever thought of that. Situations like these are good in that they show examples of how weird stuff can get from time to time lol
if the phone is recognized by Odin and youre able to get to DL mode now, you should be all set

youdoofus said:
youre most welcome! im glad you found the culprit because i wouldnt have ever thought of that. Situations like these are good in that they show examples of how weird stuff can get from time to time lol
if the phone is recognized by Odin and youre able to get to DL mode now, you should be all set
Click to expand...
Click to collapse
So, I downloaded the firmware, did a complete wipe with the csc file. Annnd bad news, it still won't charge I just gonna buy a new charging board.
I wonder why the usb works only in download mode though, still give me doubts that the charging board is the culprit. :laugh: anyway thanks for helping.

Hey, I faced a similar problem today, what was your solution to fix it?

I got the screen on my S9 replaced and now it won't charge... usually. I took it back to the shop and they got it to charge with a different cable. I tried a different cable at home and it worked for a while, but now it's not charging again. So annoying and confusing.

I am going to write how it went since there are people asking. Maybe will be helpful or not helpful for people who stumble across this thread in the future too.
So, I gave up trying to fix it and bought a new charging board, it worked for a day and then it stopped working again. I am pretty sure even the original charging board was just fine. I think the whole issue had something to do with Samsung's security or self-protection system.
I will not buy Samsung again. Thanks.