Note 8 Battery Drain.

[prahsper]

Have a Note 8 that was draining the battery real fast all the sudden. It's on android 9. I would charge it to 100, let it sit with screen off and in about 30min. it was down 59%. This kept happening. One day it went down to 0% and didn't charge anymore. So I changed the battery. It did the same thing. Depleted too fast. When it went down to 0%, again phone would not turn on nor charge again. This is what I have gone thru so far with this phone:
Replaced the battery 3 times.
Replaced the charging port flex cable
Tried several Samsung chargers
Wipe data/factory reset X2
Wiped cache X2
No apps are on the phone.

Even with all that the batteries still drain quickly. If they go to 0%, phone won't charge again. Phone will not turn on and charge until I put a new battery replacement in it-only for it to drain fast.
The only thin I have not replaced was the logic board. Could this be a logic board issue or software issue?

 

[MrMike2182]

Have a Note 8 that was draining the battery real fast all the sudden. It's on android 9. I would charge it to 100, let it sit with screen off and in about 30min. it was down 59%. This kept happening. One day it went down to 0% and didn't charge anymore. So I changed the battery. It did the same thing. Depleted too fast. When it went down to 0%, again phone would not turn on nor charge again. This is what I have gone thru so far with this phone:
Replaced the battery 3 times.
Replaced the charging port flex cable
Tried several Samsung chargers
Wipe data/factory reset X2
Wiped cache X2
No apps are on the phone.

Even with all that the batteries still drain quickly. If they go to 0%, phone won't charge again. Phone will not turn on and charge until I put a new battery replacement in it-only for it to drain fast.
The only thin I have not replaced was the logic board. Could this be a logic board issue or software issue?

To rule out it being a software/firmware problem update it if you can or if you can't update then downgrade but stay with the same bootloader version.. If it does it after doing that then it's 100 percent a hardware problem.

 

[jasdjensen]

Both my wife and I have Verizon Note 8s. We received the June patch a few days ago and have experienced SEVERE battery drain. In the battery usage stats there is no application that seems to be causing the drain. We've not had these phones very long (maybe 16-18 mo) and believe this is absolutely related to the June 2020 security update. I'm not sure if this issue is specific to the Verizon version of the patch or if this would affect more Note 8s. I'm just trying to find proof that it was the update.

 

[prahsper]

I am a tech so yes I did the repair myself. Just looking for a second opinion on this. I bought the batteries from amazon and had a good condition battery from an old Note 8 repair leftover.
However, I cannot do anything more as far as testing because I need to purchase another battery. That is the only way to get the phone back on because like I mentioned once the battery drains out phone doesn't charge anymore unless I put a new battery in. As long as I don't let the phone drain to 0% I can keep using it and charging it.
But for now to do any of the tests mentioned here I would need to get another battery first.

 

[MrMike2182]

I am a tech so yes I did the repair myself. Just looking for a second opinion on this. I bought the batteries from amazon and had a good condition battery from an old Note 8 repair leftover.
However, I cannot do anything more as far as testing because I need to purchase another battery. That is the only way to get the phone back on because like I mentioned once the battery drains out phone doesn't charge anymore unless I put a new battery in. As long as I don't let the phone drain to 0% I can keep using it and charging it.
But for now to do any of the tests mentioned here I would need to get another battery first.

Some of the phones that would drain to 0 wouldn't charge again and Samsung was replacing the batteries in those ones but some people have been able to get them to charge again so if you have a wireless charger put the phone on BOTH the wireless charger AND the wired cable charger and leave it over night and it may or may not work but you have nothing to lose so..

 

[prahsper]

Well I have found the issue and only issue. It was the logic board. The power IC chip is bad. After purchasing and connecting the new logic board everything on this note 8 is working perfectly. Battery charges, holds its charge like it supposed to. Battery drain is gone. And I can let the battery drain to 0% and charge it up again with no problem. So eventually, when I get the time, I will replace the power IC on the bad board. But for now, all is good.
Thanks to you all for your assistance.

 

[Master_yoda]

Phone will not turn on and charge until I put a new battery replacement in it-only for it to drain fast.

What exactly do you mean when you say "put a new battery replacement in"? You mean that you have opened the phone and put in new batteries? How did you put it back together? It is supposed to be sealed, and many things can go wrong after opening the enclosure.

 

[MrMike2182]

What exactly do you mean when you say "put a new battery replacement in"? You mean that you have opened the phone and put in new batteries? How did you put it back together? It is supposed to be sealed, and many things can go wrong after opening the enclosure.

Instead of for someone typing out the answer to that just go to YouTube and search for Samsung Galaxy Note 8 battery replacement and you'll see the entire process!

 

[Master_yoda]

Instead of for someone typing out the answer to that just go to YouTube and search for Samsung Galaxy Note 8 battery replacement and you'll see the entire process!

My comment was not so much about the process, but about the result. Or shall I say consequences of the action? If one opens the seal, replaces the battery (not just once, but several times) and then complains about the battery not working normally is in my opinion a bit cheeky.