My G7 Power randomly powers off and only boots charging - Moto G7 Power Questions & Answers

For several days now, I've been facing this odd issue with my G7 Power: it powers off totally random, even in wakelock, and only boots back up if it's plugged in the charger, no matter if the battery is at 100%. I've tried unsuccessfully to perform a calibration, but in this situation I just can't drain the battery without the phone powering off in the middle of the process. If I enter the fastboot mode and leave it like that, the phone stays on for hours without even getting close to a battery depletion.
I tried a hard reset, a LMSA recovery and went even further flashing the phone back to Android 9, after unlocking the bootloader, but neither of those alternatives solved my problem. I reckon it's a hardware malfunction, but what specific part is damaged?

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Sgh-i677 power cycling issue.

Since there is no specifc forum for teh focus flash I shall post this here.
1. Having issues with my focus flash where its constantly power cylces(shows Samsung boot logo gets to windows phone, shuts off repeats until battery dies)
2. The only way to keep my phone on is to constantly press the power button.if i stop pressing the "slide to power off phone appears and shutsdown anyway" (did this long enough to back up photo/music/contacts)
3. Ive tried removing battery(phone boots up as if on ac charge whenever i put the battery in)/ put on ac with battery/ replacing battery/ hard reset
4. Ive installed nothing new on the phone and the cycling happened after being out all day and phone was down to 5% or under battery life.(I put the phone on the charger and it still cycled. left it thinking maybe since power is so low it will take a lil bit to charge and fix but found it still cycling when i checked later)
5.Even with the phone apart board disconnected from the digitizer. Inserting the battery causes the phoneto boot up/vibrate
6.If anyone has any ideas what might be wrong with the mb of the phone it would be greatly appreciated. I have enough soldering skill to replace parts on small boards if need be.

Sudden death syndrome???

My s3 started randomly rebooting so I flashed a new more stable Rom.I haven't used the phone since the m7 came out so figured things needed updating. Still kept getting random reboots. Now I have a bigger issue, if the battery dies or the phone is turned off then the phone will completely act dead, no lights when plugged in to any charger, no charge animation, nothing. It will not power on. I've tried every button combination known, nothing works It just will suddenly power on one random time when you hit the power button, could be minutes, hours, even days later.At first I thought it was totally dead. Took the battery out for a day then put it back in and bam booted up like nothing had happened. Well it does this every time it's powered off completely or the battery drains. However you can do a restart a hundred times and it boots fine. I thought maybe flashing firmware would solve it but it hasn't. I'm wondering if this is sds failure? Is there a fix for the Verizon version? I am out of warranty and Samsung wants to charge an arm and a leg for repair.
Things I've done: new oem battery, different roms, Odin firmware (rt66), tested power button.
Thanks!

Phone usually wont turn on, but sometimes works great

Hey all,
I have a very odd problem with my old P500 I am trying to get running again. Almost all the time the phone wont turn on. I have tried removing the battery and leaving it, plugging it in both with and without the battery, trying various different reset combos with and without power or battery in the phone, nothing will work. Usually. Then sometimes the phone just turns on. When it does work, its great. All until you turn it off again. As soon as you turn it off, its a guarantee it's not coming back on for a while again.
I cant seem to work out any rhyme or reason as to what will let it turn on either. I have had it turn on sometimes on a charger with no battery, sometimes charger and battery, and sometimes just on battery without a charger. Like I mentioned, when it works and will turn on everything works exactly as expected. I can't find anything software-wise that seems to indicate it wouldn't load. Just most of the time (upwards of 95% of the time or so?) it won't turn on at all. Hard reset combos etc have no effect on the phone, and it won't pull up on a computer in this state either. I bought another battery recently and tried that, as I had previously had a poor battery life from it, but that turned out to have no effect on the booting issue. The most recent time I was able to boot the phone I left it on and charging for a few hours and it finished completely charging the new battery, but on turning it off it wouldn't come on again as usual.
I am suspecting a hardware problem with the phone internally, although I am not really sure. Anyone else have any clue as to what I might try? If it is hardware-based, does anyone have a suggestion as to what part might cause it not to boot?
Thanks,
AsteroidWalnut

S7 died, no response at all anymore. (Black screen)

Hello,
I am quite familar with samsung devices and flashing etc. but my friends phone died today I suppose. At some point it got stuck and got into a bootloop. After some reboots it tried to find a ota update.zip, but there was none. After some tries I got into download mode, but flashing a stock image (was stock before as well, never seen root or something) did help at first (it booted, we backupped some stuff) but at some point it got stuck into bootloop again.
This time, when going into recovery, it tried flashing a firmware again, however this ended badly (freeze while flashing). Now it's not even charging anymore. Not a single button combination is working (force reboot, recovery, download mode, ...) and when plugging into a power bank, it doesn't even charge anymore (power bank shows if a device is charging). So it's completely back and unnoticed by odin, adb or fastboot. Does anyone know this problem or have an idea, what we could try? My last idea would be to test a wireless charger, which i sadly do not have at hand.
Thanks!
Cloud2F said:
Hello,
I am quite familar with samsung devices and flashing etc. but my friends phone died today I suppose. At some point it got stuck and got into a bootloop. After some reboots it tried to find a ota update.zip, but there was none. After some tries I got into download mode, but flashing a stock image (was stock before as well, never seen root or something) did help at first (it booted, we backupped some stuff) but at some point it got stuck into bootloop again.
This time, when going into recovery, it tried flashing a firmware again, however this ended badly (freeze while flashing). Now it's not even charging anymore. Not a single button combination is working (force reboot, recovery, download mode, ...) and when plugging into a power bank, it doesn't even charge anymore (power bank shows if a device is charging). So it's completely back and unnoticed by odin, adb or fastboot. Does anyone know this problem or have an idea, what we could try? My last idea would be to test a wireless charger, which i sadly do not have at hand.
Thanks!
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Click to collapse
If it's not showing any signs of life and will not charge then it's a hardware problem, you should start with the obvious like the usb connector. You are going to have to open the phone and check usb connection, battery connection etc. but it may be easier to take to repair shop.
cooltt said:
If it's not showing any signs of life and will not charge then it's a hardware problem, you should start with the obvious like the usb connector. You are going to have to open the phone and check usb connection, battery connection etc. but it may be easier to take to repair shop.
Click to expand...
Click to collapse
but when it died the first time, i was able to flash the stock image; after it rebooted, it was charging perfectly fine until it died again. from that point on, i was not able to get any sign of life anymore... maybe something crashed that badly and it's still running and i have to wait for the battery to completely drain, so it can do something again? or is the charging process completely hardware dependent, so a crash shouldnt do anything?
Cloud2F said:
but when it died the first time, i was able to flash the stock image; after it rebooted, it was charging perfectly fine until it died again. from that point on, i was not able to get any sign of life anymore... maybe something crashed that badly and it's still running and i have to wait for the battery to completely drain, so it can do something again? or is the charging process completely hardware dependent, so a crash shouldnt do anything?
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Click to collapse
the way to test if it has power but blank screen is to hold power+volume down+home. If it has power it will turn off and boot into download mode
After the Forst Crash all such combinations didnt Seen to work either. Once odin recognized is while having a black screen. At that point I flashed stock :/ but still, not even the led was showing something

Duraforce E6560 boot loop

I've had this phone 3 years and it worked well. It's an unlocked ATT phone so no OTA updates other than the standard app updates. It's on Lollipop 5.1. Been working perfectly fine until yesterday, I was watching the CBS app, when the phone rebooted. Now it's stuck on a boot loop and initally went to optimizing apps which it rarely finishes but the times it does, the phone just powers off. It then got into another loop later last night where it'd get to the Kyocera logo then reboot over and over. I let it do that until the battery died 2.5 hours later. Then I kept attempting to boot until the batter was entirely drained to the point it wouldn't attempt to power up any more.(battery is not removable on this model). I've now charged it up, trying to enter recovery mode with power+volume down. That doesn't seem to register. Tried volume up+volume down+power with no effect. Now after charging, it will do the reboot loop mentioned earlier to the Kyocera logo. If I plug it into a charger, it will go to the optimizing apps portion and repeat the above. At the optimizing apps screen, if I unplug the charger, the phone powers off immediately. It appears to be holding a charge according to the charge indicator and the fact that I can try to boot over and over unplugged. Any suggestions? Phone wasn't dropped or damaged in anyway. Very weird what could have happened.
An update: Phone finally got past the "optimizing app" phase last night sitting on the charger. Out of no where the phone booted completely. However, it only works while plugged in. If I remove the charging cord, the phone shuts down after about 2 seconds. Booting without charging cord results in the same boot loop. I've considered the battery has failed however when plugging in the charger, battery shows 100% and it will decrease appropriately over time. I'm thinking there must be a hardware issues at this point. Somewhwere in the charging/power circuit. Any other suggestions?
Last update I guess. I was able to keep the phone up and booted as long as it was plugged into a wall charger. PC USB was not enough. I managed to grab my photos etc. thankfully. Factory reset the phone from the settings menu. Unplugged from charger, ran for about 2 minutes. Still said 99% charged, then went into boot loop again. Phone still shows near full charge if you let it run for awhile and decrements the charge state appropriately as time goes on. However, i guess this 3 year old phone is toast. No known reason for it to fail unfortunately. Thought I'd share the experience if anyone else has this issue.
djhurt1 said:
Last update I guess. I was able to keep the phone up and booted as long as it was plugged into a wall charger. PC USB was not enough. I managed to grab my photos etc. thankfully. Factory reset the phone from the settings menu. Unplugged from charger, ran for about 2 minutes. Still said 99% charged, then went into boot loop again. Phone still shows near full charge if you let it run for awhile and decrements the charge state appropriately as time goes on. However, i guess this 3 year old phone is toast. No known reason for it to fail unfortunately. Thought I'd share the experience if anyone else has this issue.
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Click to collapse
I have the same exact problem. It started the crazy booting process in my pocket, and I did all the same things you did. Factory reset didn't correct the problem, so I'm think the battery has had a stroke. Sine your problem and my problem are very close to the same time frame, our phones are also probably about the same age, and its a quality control issue. Not bad quality control, just that these batteries were designed to last X number of months or cycles, and probably they died. Too bad, because my E6560 is the very best cell phone I have ever owned. Built like a tank and thank God for that.

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