Develop Bugs

Battery Drained Rapidly Problem

Anyone encounter this problem when u r not touching your tab, and the battery drops drastically without any app running in the background? See picture for details.... see how it drops drastically in within 10-15mins at 0922hrs....

slackerz_86 said:
Anyone encounter this problem when u r not touching your tab, and the battery drops drastically without any app running in the background? See picture for details.... see how it drops drastically in within 10-15mins at 0922hrs....
Click to expand...
Click to collapse
Happened to my 8.4 Tab S once. Haven't figured out yet what caused it. It was basically after an OTA. I rebooted the tab and haven't seen it since.

Ngambek2003 said:
Happened to my 8.4 Tab S once. Haven't figured out yet what caused it. It was basically after an OTA. I rebooted the tab and haven't seen it since.
Click to expand...
Click to collapse
I rebooted alot of times m itz the same... i guess i have to reflash it again.

I had this problem when i first got my Tab S. After turning off the Automatic security policy updates i had much better battery life. Its under Settings > Device > Security >Security Policy > Automatic Updates.

Ok guys.... read this....
100% -70% in 40mins. (Listening to Music and surfing web)
70% - 50% in 20mins. (For no reason)
50% - 5% in 25mins. (Played game and installing apps)
Off it, plugged charger to it. Was surprised that it shows 48% instead. Let it charge for 2 hours. Was 87%.
On it up. Accidentally pressed the Launcher option instead of Touchwiz Home. Restarted it.
Battery shows 68%, and drop to 47% in just 3mins...
This is what I'm encountering most of the time... any ideas as to why it is like this?

slackerz_86 said:
Ok guys.... read this....
100% -70% in 40mins. (Listening to Music and surfing web)
70% - 50% in 20mins. (For no reason)
50% - 5% in 25mins. (Played game and installing apps)
Off it, plugged charger to it. Was surprised that it shows 48% instead. Let it charge for 2 hours. Was 87%.
On it up. Accidentally pressed the Launcher option instead of Touchwiz Home. Restarted it.
Battery shows 68%, and drop to 47% in just 3mins...
This is what I'm encountering most of the time... any ideas as to why it is like this?
Click to expand...
Click to collapse
Got this same problem before wherein my battery acts nuts. it would suddenly jump off from a certain percentage just like yours, sometimes, it Would show 1% and will shut itself off. Then when you turn it on, it will have at least 30-40% left. Quite annoying. Tried all battery wipe tips here. To no avail, until someone advised that he pried the back cover off only to find out a loose battery terminal . I did the same (carefully) removed the connector and reinserted it firmly. Discharged the whole battery using the tablet to around 5%. Turned it off and charge it to 100 without touching. Now it last for 2 full days (2days 10hrs) under normal usage and i'm using it as my primary phone. Listening to mp3s via bluetooth willshave off 5% in 2 hrs (with at least 20 sms sent). Playing movies in full brightness will shave off 10% (standard 2hr movie)
Before: notice the sharp, perpendicular drop - and the pulsating voltage on the last part of the graph
After: more than 5 hours, no percentage drop
Normal use, yeah, i dont use it with screen on most of the time, i simply listen to music via BT. and always on wifi
Else. If it's under waranty. Try to bring it to your service center and have your battery connector reseated for you

ThE_SoUrCe said:
Got this same problem before wherein my battery acts nuts. it would suddenly jump off from a certain percentage just like yours, sometimes, it Would show 1% and will shut itself off. Then when you turn it on, it will have at least 30-40% left. Quite annoying. Tried all battery wipe tips here. To no avail, until someone advised that he pried the back cover off only to find out a loose battery terminal . I did the same (carefully) removed the connector and reinserted it firmly. Discharged the whole battery using the tablet to around 5%. Turned it off and charge it to 100 without touching. Now it last for 2 full days (2days 10hrs) under normal usage and i'm using it as my primary phone. Listening to mp3s via bluetooth willshave off 5% in 2 hrs (with at least 20 sms sent). Playing movies in full brightness will shave off 10% (standard 2hr movie)
Before: notice the sharp, perpendicular drop - and the pulsating voltage on the last part of the graph
After: more than 5 hours, no percentage drop
Normal use, yeah, i dont use it with screen on most of the time, i simply listen to music via BT. and always on wifi
Else. If it's under waranty. Try to bring it to your service center and have your battery connector reseated for you
Click to expand...
Click to collapse
Damn i hate to send to samsung, and they will take days to rectify it here in Singapore.... any tips on DIY??

slackerz_86 said:
Damn i hate to send to samsung, and they will take days to rectify it here in Singapore.... any tips on DIY??
Click to expand...
Click to collapse
I DIY'd mine so it's possible. You need a prying tool (the one that looks like a guitar pick) simply start from the buttom (where the UsB port is) and make your way around the tablet. please be advised that some of the clamps run towards the center of the tablet so you may need to stick in your prying tool deeper. Just be careful and take your time, and try not to break any of those locks/clamps.

ThE_SoUrCe said:
I DIY'd mine so it's possible. You need a prying tool (the one that looks like a guitar pick) simply start from the buttom (where the UsB port is) and make your way around the tablet. please be advised that some of the clamps run towards the center of the tablet so you may need to stick in your prying tool deeper. Just be careful and take your time, and try not to break any of those locks/clamps.
Click to expand...
Click to collapse
But will it affect the usb port in any way? and will the cover stick back as before...?? Will there be any warranty stickers inside that will be affected prior to this DIY??

slackerz_86 said:
But will it affect the usb port in any way? and will the cover stick back as before...?? Will there be any warranty stickers inside that will be affected prior to this DIY??
Click to expand...
Click to collapse
No warranty sticker found on mine. Prepare a double adhesive tape since some of the back cover part (near the IR blaster) is held by a non-fixed adhesive. Just be sure to angle your pryer towards the back cover and be careful not to wreck any of those clamps

ThE_SoUrCe said:
No warranty sticker found on mine. Prepare a double adhesive tape since some of the back cover part (near the IR blaster) is held by a non-fixed adhesive. Just be sure to angle your pryer towards the back cover and be careful not to wreck any of those clamps
Click to expand...
Click to collapse
Heh... i ald broke one clamps. Lol!!! Anyway i realised something. The battery connector (in the pic i posted here now), the metal connector which is out of the box, is connected to the mobo. But i had to press it down. If i don't the tab doesn't starts at all. Is there supposed to be anyting there to hold it tight between the back cover and the part there?

This is the connector from battery. Sorry my drawing is not perfect

slackerz_86 said:
This is the connector from battery. Sorry my drawing is not perfect
Click to expand...
Click to collapse
Yes. You could carefully lift that up. And reinstall it - it would reset your clock though.

ThE_SoUrCe said:
Yes. You could carefully lift that up. And reinstall it - it would reset your clock though.
Click to expand...
Click to collapse
But the thing is, even if i lift it up, it doesnt connects the pin to the board....

slackerz_86 said:
But the thing is, even if i lift it up, it doesnt connects the pin to the board....
Click to expand...
Click to collapse
check out for blockage or any thing that hinders the wires to sit properly with the board. when i lifted mind before, there's a small chunk of plastic material the broke off the connector and went straight to the board where the connector is suppose to sit, i removed it then i sprayed contact cleaners on the wire-terminals before re-seating it on the board would you be able to take a photo of your board/contacts?

ThE_SoUrCe said:
check out for blockage or any thing that hinders the wires to sit properly with the board. when i lifted mind before, there's a small chunk of plastic material the broke off the connector and went straight to the board where the connector is suppose to sit, i removed it then i sprayed contact cleaners on the wire-terminals before re-seating it on the board would you be able to take a photo of your board/contacts?
Click to expand...
Click to collapse
i am on my way home. will be back in 2 hours time. what i can tell u is that i had to put something on top of the box connector so that when i put back my back cover, it makes contact to the board. if i dun, my tab will never turn on....

1st pic: As u can see, i accidentally broke one side of the holder.... lol!!!!
2nd pic: Even thou it looks like itz touching, actually itz not. No matter how i try to it just wouldnt touch.
3rd pic: i have to fold a small piece of paper to make it as a tightener between the cover and the connector to make it connect to the board. The one that does not connect properly is the left side.
If problem still persist i guess i really got a defective battery. Will get a replacement when spare parts are available on market. I don't wanna spend fortunes on samsung repair center.

slackerz_86 said:
1st pic: As u can see, i accidentally broke one side of the holder.... lol!!!!
2nd pic: Even thou it looks like itz touching, actually itz not. No matter how i try to it just wouldnt touch.
3rd pic: i have to fold a small piece of paper to make it as a tightener between the cover and the connector to make it connect to the board. The one that does not connect properly is the left side.
If problem still persist i guess i really got a defective battery. Will get a replacement when spare parts are available on market. I don't wanna spend fortunes on samsung repair center.
Click to expand...
Click to collapse
oh my, you pry the board off, that needs to be re soldered.
disconnected terminal

This is the whole thing when i opened up my cover. That iz y i say the whole thing is out.... it is already like that.

same problem ?
I think I have the same problem.. I'm just scared if it is because I rooted my device...
I have bought a otg cable to connect my ps3 controller to my tab s . That's drained my battery in a record time but I wasnt thinking it was problem.
I played with my ps3 controller and tablet until it shutdown iteselft. I plugged my tab on the wall right after and it shown 45% ... I restarted and sames battery life was showing. The app I used is sixaxis enabler.
I let it charge up to 90 % and watched movie. The battery drained quickly too..
Will do somes tests to be sure if it is normal or not...
Ah before to forgot I watched movies before and the battery seems to have decreased quicker.

[Guide] Preventing and what to do if phone get in hardware bootloop (red light)

Hi, I just bought mine Nexus 5x few weeks ago, and 1 day after I started hear about the hardware bootloop problem. It made me scared.
I started searching about the problem and, until now, the conclusion about the problem is the phone gets heat and melt the solders of processor. That's a "comum" problem in LG phones, LG G4 have the same problem.
"-Ok, but, what causes that?"
My opinion, as lay, it is caused by cheap USB-C Cables and/or wall adapter. Fast charger adapters can also be a big problem. (Source: http://www.makeuseof.com/tag/buy-usb-c-cable-wont-destroy-devices/ and https://forums.oneplus.net/threads/in-response-to-the-type-c-cable-discussions.412344/ ) USB-C transfer a lot of power through it, accelerating the process of charging and, consequently, making phone hot. The poor solder who LG's did on the phone start to get melted with the time.
Prevention you can take:
You can make this test in first of all:
https://forum.xda-developers.com/nexus-5x/help/diagnosing-soon-to-bootlooped-phones-t3543830
1- Use only the original cable and wall adapter who comes with the phone
2- Buy only well constructed USB-C cables (maybe it means expensive one, but you will expend more money buying a new phone than a good cable)
3- Keep control of phone's temperature with some app ( I use Cpu Monitor) and never let it exceed 45°C/50°C. If the phone reach this temperature, turne it off immediately (more recommended) or enable battery saver mode.
If the phone suddenly get heat and turn off:
1- DON'T TRY TO TURN ON! Wait until it gets more cold and than try to boot. If it boot, try to make a backup of you important things.
1.1- If the phone is in warranty, send it back and they will send you a new one.
1.2- If not, go to step 2
2- You can try to fix at home. Here are some links:
https://forum.xda-developers.com/nexus-5x/help/rld-fix-red-led-death-t3541536
https://www.youtube.com/shared?ci=i6eu7OK_4t8
3- If it don't work, you can take the phone to someone who works with this and ask for him to make new solder for the CPU.
If anyone know more tips or even solutions, please, contribute to the thread.
**sorry for eventually grammatical mistakes**

Bad quality soldering is really a common problems. Most of my mobile devices - especially notebooks - died because of this. I guess everybody had the problem once where a laptop get bluescreens more often with time until he finally refuses to boot up. Usually, damaged solder connections from chips to the mainboard are the cause for such problems. The solder connection degrades due to thermal and mechanical stress. With time, more and more micro-cracks are emerging with the result that the electrical resistance is increasing. Thus, signal transmission is distorted and bluescreens or crashes occur more regularly until the device dies.
In fact, a thermal treatment can help! The idea is to melt the solder to gain a reflow of the solder which repairs the micro cracks. Although there are semi-professional reflow ovens available on the market, you wouldn't buy one just to repair one device. But you can try do this by using your oven in the kitchen, a hot hairdryer or (if available) hot air gun. The best procedure (independing of the used heat source) is to disassemble the device, detach the battery (!) and if possible remove plastic parts. If these parts can not be disassembled, you can protect them by wrapping them with aluminium foil (it will reflect heat radiation and thus prevent fast heating of these parts). The best case would if you just have the small mainboard with the soldered chips on it. The start the thermal treatment: turn your oven to max. temperature possible, wait until its pre-heated and put the device into it for around 2-3 min. This time should be sufficient to remelt the solder connection (and repair them) and short enough to overheat the plastic parts. If it didn't work, try again with about 30 s longer duration. If you use a hot air gun try to apply the hot air stream only the soldered regions. Usually you can see if the solder gets hot enough. If its working with a usual hair dryer? I dont't know..
I used the kitchen-oven procedure many times and sucessfully revived many notebooks...

2 serious issues i need to fix with A7 2017

Hello, i only have my smart phone (my first one ever) since yesterday.
Managed to set some things up but i can already tell these devices consume a lot of time to do be set up and working right.
One of the first things i did was upgrade it to the latest Android version (7).
Today i took it to the pool to test it's water resistance - it is water resistant, that's the good news, but the bad news is that every time i held the phone under water it would stop recording the video after just a few seconds being submerged, and this with both, front and rear camera - it always showed some note saying something like "in this mode it can not zoom in and zoom out"!! Huh, i did not try to zoom in or out at all and have no clue why it would do this, anyone having an idea??
Next problem ... yesterday (with the original Android version it came with still on) i could connected the USB cord to the laptop and get my pictures out of the device .. today every attempt (except 1) gave me a Windows error message saying something like Windows can not recognize this USB device!! I tried everything, plug te cord into the USB2 port instead of the USB 3 port, same problem, i rebooted te laptop, same problem, i rebooted the phone several times same problem, what on earth is this and how can i fix it??

Hello, are you sure you have the android 7.0? Thanks
You should do factory reset, its highly recommended after android upradge. Be sure to back up everything important, as it will erase internal storage.

7.0 !!!

Rudme said:
Today i took it to the pool to test it's water resistance - it is water resistant, that's the good news, but the bad news is that every time i held the phone under water it would stop recording the video after just a few seconds being submerged, and this with both, front and rear camera - it always showed some note saying something like "in this mode it can not zoom in and zoom out"!! Huh, i did not try to zoom in or out at all and have no clue why it would do this, anyone having an idea??
Next problem ... yesterday (with the original Android version it came with still on) i could connected the USB cord to the laptop and get my pictures out of the device .. today every attempt (except 1) gave me a Windows error message saying something like Windows can not recognize this USB device!!
Click to expand...
Click to collapse
The phone being water resistant as far as I understand does not mean that it can operate normally under water. It means that being submerged in water (hopefully) will not destroy it. Your particular problem might have to do with the touch screen. Capacitive touch screens can wrongly detect humidity as touch - even if you use them with wet hands. So maybe the display just detects user input while under water?
For the other issue I am afraid I cannot help. Windows can have the most bizarre USB issues. Just make sure that if you ever you did submerge your phone, you do not plug it to the PC (or anything else) before you are absolutely 100% positive that there is no residual humidity in the USB port.

nurunet said:
The phone being water resistant as far as I understand does not mean that it can operate normally under water. It means that being submerged in water (hopefully) will not destroy it. Your particular problem might have to do with the touch screen. Capacitive touch screens can wrongly detect humidity as touch - even if you use them with wet hands. So maybe the display just detects user input while under water?
For the other issue I am afraid I cannot help. Windows can have the most bizarre USB issues. Just make sure that if you ever you did submerge your phone, you do not plug it to the PC (or anything else) before you are absolutely 100% positive that there is no residual humidity in the USB port.
Click to expand...
Click to collapse
Thanks for the useful reply, i can actually by now answer the issue with Windows not recognizing the USB port of the smart phone, and hopefully this will help others that i have noticed have come across this same issue in great numbers .... I noticed first that also quick charging only did slow charging, using the same port as needed to connect the device to a pc (USB port) than i also noticed that the speakers had no sound .... so i dawned on me ... there is HUMIDITY from the lengthy under water testing in these two "cavities"!! I mean, no water went into the device as such, but some humidity remained in there even though the rest of the phone was completely dried up and everything else was working just fine. Did what i learned online somewhere ... blow it out with the mouth as good as possible and than drop it into a bowl of rice (the rice sucks up moisture like a sponge or even greater). After an hour or so the USB worked just fine again, sound was not yet back in the speaker only in the headset, but after another 'rice hour" also that came back to live!!
Now i only have to find out if under water video taking is simply impossible .. but than again, i saw plenty of such under water videos taken by people in pools, so it should actually be possible, just how??
Yes, touch functions do not react well anymore when the hands are completely wet and this is something don't get, for photos we can use the volume rocker, but for videos not, but it would make a lot of sense to have the option as well for video when the device or the hands are very wet.

Rudme said:
Thanks for the useful reply, i can actually by now answer the issue with Windows not recognizing the USB port of the smart phone, and hopefully this will help others that i have noticed have come across this same issue in great numbers .... I noticed first that also quick charging only did slow charging, using the same port as needed to connect the device to a pc (USB port) than i also noticed that the speakers had no sound .... so i dawned on me ... there is HUMIDITY from the lengthy under water testing in these two "cavities"!! I mean, no water went into the device as such, but some humidity remained in there even though the rest of the phone was completely dried up and everything else was working just fine. Did what i learned online somewhere ... blow it out with the mouth as good as possible and than drop it into a bowl of rice (the rice sucks up moisture like a sponge or even greater). After an hour or so the USB worked just fine again, sound was not yet back in the speaker only in the headset, but after another 'rice hour" also that came back to live!!
Click to expand...
Click to collapse
I am not an expert, but to me it seems you were lucky the use of the USB connector containing residual water did not damage the phone (or perhaps even the PC). No matter how waterproof the device itself is, due to the open design of our devices' ports, water can collect in them. If you plug a USB cable or headphones, a current will flow. Water in a connection like that can cause a short-circuit. For that reason my old Xperia had little port-doors that sealed the USB port. Unfortunately, those are prone to break off - and simply a pain in the back side to open and close for every charge.
My A5 got wet once, and there even was a message along the lines of "Moisture detected. Please do not plug anything until 100% dry again." And I think that advice should be heeded.

Nope, it still says 6.0.1
Pandotaz said:
Hello, are you sure you have the android 7.0? Thanks
You should do factory reset, its highly recommended after android upradge. Be sure to back up everything important, as it will erase internal storage.
Click to expand...
Click to collapse
Hmm, i thought the update (pretty heavy one) was to Nougat and not just an updated version of Marshmallow .... bummer

I find it absolutely crazy that you tested your device by submerging it in water for an extended length of time.
Water resistant does not mean waterproof.
I highly doubt that Samsung actually intend the phone to be used under water. Moreover it's protection against accidently dropping the device in to water and gives a level of protection where the device won't be instantly ruined.
They don't make specific underwater cameras for nothing.
Secondly the error regarding the malfunction isn't surprising either. The focusing system probably isnt designed to cope with the refraction effect of the water.
It may work in fixed mode, I don't know. However I don't think it's actually intended to be used that way.
Let alone the damaging effect of electrolysis by passing a current through a water soiled port.

Fixed mode??
ashyx said:
I find it absolutely crazy that you tested your device by submerging it in water for an extended length of time.
Water resistant does not mean waterproof.
I highly doubt that Samsung actually intend the phone to be used under water. Moreover it's protection against accidently dropping the device in to water and gives a level of protection where the device won't be instantly ruined.
They don't make specific underwater cameras for nothing.
Secondly the error regarding the malfunction isn't surprising either. The focusing system probably isnt designed to cope with the refraction effect of the water.
It may work in fixed mode, I don't know. However I don't think it's actually intended to be used that way.
Let alone the damaging effect of electrolysis by passing a current through a water soiled port.
Click to expand...
Click to collapse
Thanks for your answer ashyx.
I did not submerge the Samsung Galaxy A7 (2017) without due prior research!
Meaning .... if you check on Youtube for under water videos taken with this particular smart phone you find a bunch that all seemed to have great fun with it for extended periods of time in the pool, so i assumed if it works for them it should also work for me .... but, of course, your point was also of concern to me, none of these videos tell me what happened to their phones afterwards etc.
On mine the headset, for instance, still works for sound, but the volume and mute buttons on the headset are currently no longer reacting and the speaker is off and on still .... on the other hand, the water resistance clearly points out "can be submerged in water for up to 30 minutes and i am not sure if it says a debt of 1.50 or only 0.5 meters, and i never put it further down than maybe 10 or 20 cm's and for less than 5 minutes each time, so, it this IP68 or whatever it is called is of any real life truth and value the device should have zero problems with being under water for a video of 2 minutes at 15 cm or so dept.
Your thought of the water interfering with the focus metering i can agree with, was also my thought, but in all the YouTube videos i did not see this type of problem , so i am not sure if this was a case that these people all new how to set the camera into some FIXED MODE - can you please let me know how to do this, i did not find any settings for this???

Won't the message about moisture warning appear not allowing you to charge?

It will - but will you see it??
Pandotaz said:
Won't the message about moisture warning appear not allowing you to charge?
Click to expand...
Click to collapse
Absolutely Pandotaz, but this message appears on the login screen and i have no login pwd or the like established, so it disappears quickly .. not to mention the small and hard to read print, in other words, easy to over look, exactly what happened to me, but that's what happens to not-so-smart- smart phone beginners who are already a bit older than average :crying:
At this point i would like to repeat my question in last reply, how do i set a smart phone camera to "FIXED MODE " anyone??

Fixing a dead LG G3 (D855) with a hair dryer

Hello people of the internet and most likely LG G3 users. Yesterday my LG G3 D855 died right when I was about to watch some good hentai. I’ve been having screen flickering for ages in the YouTube app and as of late the screen also started to fade to black from the corners, random reboots were also quite common. Android became unresponsive for a couple of seconds and then the screen when completely black in a split second. Tried a lot of things after that: removed the battery countless times, changed with an old battery, charged it for hours at the time (battery wouldn’t get hot so no charging), connected to my desktop. No Android, no TWRP, no bootloader, nothing could make my G3 do anything. I was convinced it became a paperweight. After that I proceeded to disassemble the phone. Disconnected all the ribbon cables of the cameras and the display etc and put them back in firmly. That did do anything. HOWEVER I remembered when I was wasting time reading toxic XDA comments and stuff that someone mentioned baking the device to restore connections between the motherboard and the SOC, or something like that. So I did some research and even though something as stupid as putting it in the oven actually seem to work for people. Mum wouldn’t let me put it in the oven so I made my own way of resurrecting my G3. This is what I did to get it back working:
I’M NOT RESPONSIBLE IN ANY WAY IF THIS GOES WRONG AFTER TRYING THIS. IT IS 100% YOUR CHOICE TO DO THIS OR NOT.
Requirements:
DISSEMBLING
LG G3
Screwdriver small enough to remove the G3 screws
Plastic prying tool (old credit card, solid thin plastic will do also)
Good light source
REVIVING PROCESS
Hair Dryer that can get a fair bit hot
The grill of an oven
Stopwatch
A floor that can withstand heat
A place that can be ventilated in case of toxic fumes (nothing happened for me)
Safety goggles (I didn’t have and so didn’t use)
Electrical fire extinguisher (I didn’t have and so didn’t use)
STEPS FOR MAKING AN UNDEAD PHONE:
1. Remove battery, SIM card, SD card.
2. Proceed to disassembling the phone to the state where you only have the motherboard. I used these guides:
https://www.ifixit.com/Teardown/LG+G3+D855+Teardown/42288
And
https://www.youtube.com/watch?v=sNymIdIXTyI
3. Place the oven grill on a surface that can withstand heat and then gently place your LG G3 motherboard on it.
4. The heating process:
1.
Turn on the hair dryer and start to focus the heat on the part of the motherboard that is facing towards you when you take it out. So not the part where you see the SOC. See image. Hold the hair dryer close to the motherboard (5 cm space or so) and do this for 10 minutes.
2.
Let it cool down for 5 minutes and turn it around.
3.
Proceed to heat the SOC for 15 minutes and let it cool down fully for a minimum of 15 minutes.
4.
But it back together, hope that luck is on you side and that it will turn on.
NOTE: First boot went all the way till android boot screen when it crashed with screen flicker. I removed the battery and waited a minute or two and tried it again and it has been working ever since yesterday night. This is probably not a long-term solution so I’d suggest just using this to get your data off you phone and moving on to another device as fast a possible.

EDIT: Like I said before use this method only if you find putting it in the oven is to risky. My phone has now stopped working. This really is a temporary fix for if you just want to backup you remaining data.

i have used G3 for last 3 years and its was still good phone in market ..ok to the point
i have 3 G3 and one i bought for experiments and i put in Oven and guess what it show some sparks and burn from botton pat of the board so dont ut in oven it can burn and ic on board .. heating through hair dyer is safe i think for noobs... thanks

Question Z Fold 3 'Too Cold To Charge' after water damage

Okay, hello XDA Forums peoples! Ive been lurking here for like a decade. I feel bad for bothering you nice people, but now I'm at my wits end with this phone.
Okay, so, long story short:
Z Fold 3, let it run the One U.I. 4 update, bricked the whole phone, wouldnt come back on. This happens a week away from being out of warranty. So i get samsung to agree to let Asurion/uBreakiFix repair it (I almost always fix my own electronics, I hate Asurion, I've had problems dealing with them before, but its free so whatever). Well they get it working, i asked what they did and they were basically like 'uhhh idk'. I assume it was just an 'unplug the battery and plug it back in' kind of thing.
Anyways fast forward to a couple months ago. Im walking along the creek, i always keep my phone in my backpack for safety. Zipper on my backpack comes open some, phone falls out and directly into the water for about 3-5 seconds. Goes black within 15 minutes. Alright, so it seems like maybe the boys who worked on this didnt seal it back properly. Whatever.
I let it dry for about 4 or 5 days. Comes back on, everything works except the front screen's digitizer(which is cool for me, because the inside screen still works fine) and its reporting too cold to charge, so now once the battery runs out i have a new foldable brick! Yay! I check the battery temperature thats reported in settings and its completely fine. I hit it with a hair dryer for like 5 minutes to try and trip the thermometer, and nothing happens.
I tried some cheap shots in the dark, i replace the USB charging board, i replace the wireless charging coil, both of which have thermistors on other older samsung phones, so i figured it was a decent guess. Still too cold to charge.
So I find a schematic, or not exactly a schematic, but like a boardview, i guess. So at least i know where the thermistors are to check them. Theres about 10 thermistors on the main and sub boards. 5 of which are covered by metal shielding which i am just terrified of trying to remove, mainly because i havent done it before. So i check the other half.
The thermistors used in these phones are like inverse, so they have less resistance for higher temps and more resistance for lower temps. If one of them is dead, it will have like "maximum resistance", right? Which would report the coldest possible temperature, right? So that all makes sense, to me at least.
The 5 i can get to with my meter to check, they seem to work completely fine. From what research ive done they seem to be like 100k resistors when measured at ~70 degrees f, and i can watch the resistance go up and down when its cooled or heated past that temperature. Okay, perfect. That all checks out.
Because the other ones are under some metal shielding, i assume theyre most likely fine because any water would have a harder time getting in there. So i skip to the most expensive option so far: i buy two replacement batteries. The schematics do not include the battery, so i dont know where the thermistors are on my current batteries to check them, if that was the problem.
Well, batteries came yesterday, i pop them in, still too cold to charge. I've already ran the phone dead checking it, so i cant do any further diagnostics with the phone on. And now the most i get is a Yield sign with a thermometer in it when i plug it in.
Okay, so... Idk?? This problem is starting to get over my head. What do y'all think? It seems like my options are becoming more limited and expensive.
I can try and put a big blob of solder on the top of the shielding and pull it off to check the remaining thermistors, which seems to be how people remove those things. I also have have hot air at my disposal, which is always risky with tiny things because too high airspeed might blow components away on the board and then i'll probably cry.
It could just be a connector somewhere on some flex cable? Maybe? I mean like maybe what if one of them is for reporting temperature, and water corrosion is stopping it from sending a signal through???
Im fine with doing whatever, but i just want a charged battery first so i can recover my data before i do anything that drastic. I mean, back in the day they had 4 big pads on a removable battery. You could buy a universal samsung battery charger or rig a USB cable to charge it, but I have literally no idea what to do here. Does anyone know of some specialized battery charger that will connect to these flex cables?? That would be a gigantic help right now. Or if i knew where to get a Z Fold 3 just to pop it open and charge my battery with? Or maybe just sit there for 2 hours holding two wires to the positive and negative pins?!??!?? I dont know. Someone throw ideas at me, please!

Might be worth buying a bench power supply and either injecting voltage through the phone or connecting it to the cells to trickle charge them back up? Im not an expert it these just throwing ideas