water damaged wont recognise battery

Hopefully this helps-Calvin Mogilinski

Only responds when being plugged into a charger

If you cannot get your Samsung Galaxy S6 to power on but it seems to recognize a charger and the charging light will come on when the phone is plugged in, then this is a good sign as it indicates that there is at least some life left in your phone. If your device falls into this category, then I recommend that you try to locate and then attempt to utilize a replacement battery. The battery may have been damaged by the moisture as opposed to the phone and a replacement battery may be the key in getting your phone to start up and work again. Any battery that you know is operational and is functioning properly should work. You can barrow one from a friend or family member or if your phone is still relatively new you might even want to consider going down to a local retail location to borrow a battery from one of the phones on display at that location. Just temporarily to see if it works of course. If it another battery does work, then you will have successfully located the cause of the problem and you can look into purchasing a replacement battery.

If you determine that your Samsung Galaxy S6 requires a replacement battery or if you are unable to find a working replacement to use as a test, then I suggest that you consider checking online to see what a replacement battery for your particular device is selling for. Typically, replacement batteries are pretty affordable and are relatively easy to acquire from online stores like Amazon.

Note: If your particular model of smartphone was designed with a non-removable battery then this task is going to be a little more difficult for you but will likely require you to take apart your phone in order to remove and then replace the battery. If your phone falls into this category, then you may want to save this step in troubleshooting as the last and final solution for your cell phone.

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Check for corrosion around the the battery connector (on the motherboard) clean w/ 99% IPA, or perhaps ultrasonic cleaner, and if necessary, try reflowing connections in that area.

I have several water damaged s6 motherboards that reboot like you describe, somewhere there is a harware issue but I can not track it down.

However I have had some with corrosion around the battery connector on motherboard that I've been able to clean up and fully recover

i have a s6 edge and i it had water damage and i replaced my battery and the phone still wont turn on but when i plug a charger in it does but soon as take charger out phone cuts off but battery is 100%

im on same problem mine says 95 percent ive got it plugged in with a fast charger can get phone on soon as i unplugged it just cuts out but when off charging seems it working as now 97 percent battery but just wont use battery to turn on or stay on

Well mine also had a problem. Also water damaged. Connected to charger it says 100% but when turn on it is only 4%. Also when plugged in, it will reboot loop until it sbuts down voluntarily. Please help.

Hopefully someone can shed some life maybe ifixit can have my board for free and have a look see if they can fix it and reply with resolution as I'm getting a new board so won't need this one