Can someone give me an overview of the Android boot cycle (especially on the S4)?
For example, I've noticed that if the phone freezes and I have to pull the battery, on the first powerup after that, the Samsung boot screen stays up for about 40-60 seconds instead of the usual 10 before the Cyanogen boot screen loads up.
So what's going on the background? I would have thought that during the Samsung boot screen, it was primarly hardware routines that were loading. If CM is doing a check/repair, I would have expected that to occur during the CM boot screen.
So, can someone shed some light on this and give me an overview of the boot cycle? And is there any way to see what's going on (similar to how Linux boots, where you have a real time text log showing you what's happening) - at least when a non-normal boot is occurring?
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My HD2 is stuck in boot loop mode. It won't turn on unless I plug in a charger and when I do it instantly turns on, goes to the "Stick Together" screen for about 20 seconds, turns off, and then repeats the process. I did a hard reset and was unsuccessful in fixing the problem.
Any ideas?
wanted to know if flashed it with a custom rom or updated or added tweaks. please give us a background of what you did to better point you to the right direction.
I've noticed that when I'll turn off phone and then put USB in, red LED is lighted for few seconds, suddenly phone starts, battery stops loading and MAGLDR is executed. It seems MAGLDR substitutes code for battery loading. Does it mean, that if I'll make battery totally empty I won't have a chance to load it without OS (which handles battery loading process)?
http://forum.xda-developers.com/forumdisplay.php?s=&daysprune=-1&f=989
Please don't post the same question in multiple forums.
http://forum.xda-developers.com/showthread.php?t=950031
My S4 has finally kicked the bucket. It turns on long enough to display the "Samsung" splash screen with the padlock icon that says "Custom." After about two seconds it instantly shuts off, and can't be turned back on.
Pull the battery, the phone automatically turns on, shuts off again, rinse and repeat.
At this point I just want to salvage my pictures and music from the phone; is there any way I can mount the internal SD in the state that it's in? I'm sure this power issue is hardware-based; I can't get into recovery or download mode before it shuts off on me.
I was having this same problem recently as well. It happened on two separate occasions with about a week in between. The first time it came back after a few battery pulls and attempts to boot to recovery as well as download mode. The second time I fiddled with it for about an hour with numerous battery pulls and attempts to boot to recovery and download mode. I even swapped batteries to no avail. I don't know why exactly it finally decided to boot, but I haven't had an issue with it since. Maybe keep trying and hope for the best?
Can you boot and stay into recovery or download mode?
If not, then it very well might be a button issue. Have the phone checked out or you can do it yourself with a voltmeter if you have the knowledge and tech. Otherwise take it to a professional. I paid around 15$ to a button replaced. Which kinda seems a lot, considering a set of 4 buttons costs about 5$ and then you can do it yourself since it doesn't appear to be that hard, especially if you've done soldering before.
So, I have a Samsung SM-T230NU. When I tried to power it on, it flashed for a split second the Samsung Galaxy Tab 4 logo and then went blank. I figured it was out of juice, so I plugged it in and let it charge for an hour or so.
When I came back, it was flashing and going dark.
I tried a different cable. As soon as power was applied, it flashed and went dark again.
Now, the boot logo is showing for an even briefer amount of time.
I am suspecting the battery or USB port. I don't have parts readily available to swap, however.
It may be worth adding, when I plug in the device, without touching any buttons, the screen starts flashing the Samsung Galaxy Tab 4 boot logo. I would guess a stuck power button, but the power button travels freely. When I unplug the tablet from the computer, the flashing stops.
Trying to boot it with power + volume up garners no response from the device.
Any ideas?
Having same issue here
Tried hard reset, no dice.
Tried opening the back to see if I can identify some loose connection, didn't see anything funny. I am not an electrician.
My sister's having the same issue with her T230NU. It still boots (it'll boot to the Samsung splash, but then it flashes off the screen in half a second; this repeats every 7 seconds), but only if it's plugged directly to the wall charger. She let it sit overnight to charge, and it's still got this issue. I'm pretty sure her battery was drained when the issue started occurring last night, but it doesn't look like the battery has charged much (if at all) since then.
I have a galaxy s4 (i9500) and got it in used condition, a year ago. Never suspected a single problem in it.
Today I powered off my mobile for charging then after 25 minutes I took it off. I held the power button then I saw my boot logo(Where there is written Samsung Galaxy S4 GT-i9500). That logo kept showing as usual for 2 seconds and screen went black and again that logo appeared for 2 seconds and screen gone black and again it appeared, so, I'm stuck in kinda loop not a bootlooop exactly(maybe because bootloop refers to being stuck on boot screen while in my case its boot logo). I then removed the battery and inserted it back after an hour and as soon as I inserted it back the mobile itself turned on as if I held power button but this time again I was stuck in that loop. Moreover when I tried going into download mode, I didn't even need to hold the power button along with the volume down and home, it itself proceeded to confirmation screen of odin mode. And after that confirmation screen appeared saying that whether I really want to boot into download mode, disappeared itself after like 3 or 4 seconds even though I didn't press any key. And in case I press vol up key confirming to boot to download mode, then it again takes me to that loop. I'm too much confused . I can't even flash the firmware as it won;t boot to download mode neither am I able to boot into recovery.
Now do u really think the problem might be the power button(Which is maybe stuck in the state of pressed).
Or else it can be the battery coz my battery is also just average not too good?
I also inserted the command( in build.prop file) for enabling nav. bar and the code was correct but I never rebooted after inserting that. this was the first time I rebooted after that.
SOrry for some bad English.
Do you have something like this? I'm now having problem with getting my phone back to work...
https://youtu.be/HxnV-tn2vpA
From what you say it seams like power button problem, try to start the phone and connect it to the charger. When it start take out the battery, it will be powered by charger and you will eliminate battery problem.