[Galaxy Note 4 Q&A, Help & Troubleshooting] mstoynov90:
Hi there, people.

I am having a weird issue with my Note4.

After tons of reading about it(here and all over the net), I don't seem to be able to fix it.

So... here's the situation -

I tend to put my phone next to me in bed, on charger, when I go to sleep. One morning I woke up and I saw it continuously restarting, only managing to get to the "Galaxy Note4" screen.

It was running 6.0.1 stock the last time it worked.

I've played with my old Galaxy S2 before and got some Cyanogenmod (and other) ROMs on it. So I decided to try to fix this one. I googled about the issue and tried a few things, but was left a little baffled, since I was unable to enter Recovery mode.

So basically I was left with the only option to reflash stock rom with ODIN. I did, but nothing really changed.

I saw on the net, that commonly this is a battery issue. I was almost sure it's that, so I went to a shop and tried booting it up with a brand new battery. Didn't work out, nothing changed. So I decided not to get a new battery, since that wouldn't really change anything.

Therefore I decided to bring it to a local phone repair shop and have it checked by someone more skilled at this.

I did, and few days after I got my phone back, in a working condition, back to 6.0.1 stock (just as it was before). The repair man said that it was pretty messed up but he managed to get it back running. Apparently, he reflashed it few times. At least that's what I understood.

Nothing has been replaced in terms of hardware.

Few HOURS after I got it back from the repair shop, I was just randomly browsing on it, and it decided to restart itself and went into bootloop again.

Recovery mode was once again, non-available.

I set it aside for few months, since I was really busy with work and had no time to spend on it, and used my old S2 in the meantime.

Recently I picked it up again to try to fix it. What I noticed is that when plugged into USB (doesn't matter if PC or wall charger) it does not show the Battery charging icon, but it's either off, or boot looping.

It apparently charges while looping, because the battery is not dying even after hours of this.

I decided it might have something to do with the charging/power PCB module, so I got a spare and replaced it myself. Unfortunately it made absolutely no difference.

Some facts, so I can cover most of the questions you might have:

-It has no microSD/SIM card inserted.

-When I got this phone it was on 5.0.1 and after few months of use I updated it to 6.0.1, using the regular procedure.

-No custom ROMs or anything unofficial has been flashed on it.

-Power button is fine, it does not power on by itself, hence it's not stuck or anything. I took the time to actually remove the power button module (with the vibrator) and power it up with the battery insertion method. No difference.

-The rest of the buttons are also fine. Vol Up/Down both work in Download Mode, Menu Button also works as expected.

-ODIN manages successfully to flash whole packages of pretty much any N910C 6.0.1 firmware I tried. (and the TRELTE_EUR_OPEN.pit, with or without NAND Erase All) That changes nothing. (hence why I suspected a power module issue, not a software one)

-I tried pretty much any version of ODIN, and this also made no difference.

-Changing to a new battery does not resolve it.

-By some chance it managed to go into Recovery ONCE (with a freshly reflashed 6.0.1 firmware) and I did wipe cache, but this changed nothing. Since that, I never got into Recovery again.

- In Download Mode it says:

ODIN MODE

PRODUCT NAME: SM-N910C

CURRENT BINARY: Official

SYSTEM STATUS: Custom

REACTIVATION LOCK: OFF

Secure Download: Enabled

KNOX WARRANTY VOID: 1

RP SWREV: 2

I am running out of ideas.

I'd really love to hear your thoughts on this, since I really like this phone, and I have the feeling it might be something simple software-wise I'm missing.