Galaxy S7 moisture detected error, won’t charge, black screen issue, other issues

There are millions of #GalaxyS7 users at this time so it’s expected that there will a lot of users reporting any form of problems. This post tries to answer some of such issues so we hope you’ll find this article helpful. We expect to publish more S7 posts in the coming weeks so for those looking forward to seeing their own issues and solutions published, keep watching out for them.

If you are looking for solutions to your own #Android issue, you can contact us by using the link provided at the bottom of this page.

When describing your issue, please be as detailed as possible so we can easily pinpoint a relevant solution. If you can, kindly include the exact error messages you are getting to give us an idea where to start. If you have already tried some troubleshooting steps before emailing us, make sure to mention them so we can skip them in our answers.

Below are specific topics we’re bringing for you today:

Problem 1: Galaxy S7 edge crashed, won’t turn back on

Hi there. I have a Samsung S7 edge and one evening the phone froze and crashed. Since then the phone won’t charge or turn on, therefore I can’t do any of the usual troubleshooting options (soft reset, safe mode, wipe cache, etc). As my phone is less than 12 months old I decided to send it off for repair through Vodafone. However it has come back as beyond repair and they are saying the warranty is void as they seem to think it has had unauthorised work undertaken on it. I can categorically say this is not the case, but don’t seem to have any wiggle room to prove otherwise. Do you know why they would think unauthorised work has been undertaken on the phone and what they do to check this? I’m completely baffled by this. It seems my only other option is to try and fix the phone through unofficial channels. However, given that the phone has been described as beyond repair and won’t turn on or charge is it even possible to take this route? Any advice you can provide will be greatly appreciated. Thanks very much in advance for your help. Kind regards. — Lee Hayes

Solution: Hi Lee. Every service center including Samsung’s and that of your carrier can have their own ways to determine whether a user has attempted to tamper with the device or not. In general,the telltale signs can be grouped into two: hardware and software. For possible hardware modifications a user may have attempted, a service center may check for a broken or missing physical seal. If the phone’s liquid display indicator has been tripped due to water damage, the phone’s warranty will be voided and the service center may not repair it even if you’ll pay. In some cases, even an external scratch made by a screwdriver may be detected and classified as an attempt to open the device. Software-wise, the service center will have a way of knowing whether or not the phone has been rooted or running an unofficial Samsung/carrier firmware. That the phone is already deemed out of warranty even though it’s not yet over 12 months may be a clue that the service has discovered some things that voided the warranty. If you never attempted to open your device before and it’s running official software before it stopped working, you should demand a reason why Vodafone service center refuses to fix it. If they will still not fix your phone even for a fee, you should try your luck with an independent service center.

As we have no way of physically checking your phone, there’s no way we can give you any accurate advice what is wrong with it. The possibilities can range from a malfunctioning charging port (you can’t charge, hence you can’t power it on), bad battery, failing power management IC, to other unknown motherboard problem. If you want to get to the bottom of the issue, you should have the phone checked by a professional.

Problem 2: Galaxy S7 moisture detected error, won’t charge

My phone seemed to be losing charge faster than normal. I plugged in a charger at 4% after the screen had gone dark. I thought I saw “Moisture Detected” on the screen. Several ‘bleeps’ like the charger was connecting, disconnecting, connecting, etc. I did the soft reset, nothing. Phone Went to Black screen like it was hibernating. But it never charged. No sign of the charging signal. Tried different chargers, cords. Then tried same chargers & cords on Samsung tablet – they worked. Took phone to Verizon store to see if WIRELESS charger would work. No. The phone never went on. The associate at the store Tried same wireless charger on another almost dead phone. Those phones charged. I was told the charging unit is connected to screen (?!?) which makes it not cost effective to fix. My phone is dead, cannot charge using multiple charges or wireless charger. I’d REALLY like to fix the phone that is only a little over a year old (and not paid off) but… This doesn’t look good. — Robinrodeeschneider

Solution: Hi Robinrodeeschneider. At this time, we all know that you’ve already isolated the cause of the issue, and that is a hardware failure. Android troubleshooting is simple and only covers software issues. That your phone won’t even turn on in the first place is an obvious reason why there’s nothing much that you can do. Unless you have the skill and tools to diagnose and fix hardware problems, particularly in a Galaxy S7, a do-it-yourself repair is really out of the question. An experienced technician needs to run some hardware diagnostics in order to identify where the problem lies.

What you can do right now is limited to seeing if leaving the phone connected to a charger will work and power on the device. If the phone will successfully charge but remains unresponsive, or won’t boot normally at all, you can then try to see if you can restart it to alternate modes. For reference, here are the steps on how to do that:

Boot in Recovery mode:

  1. Charge the phone for at least 30 minutes.
  2. Press and then hold the Home and Volume UP keys, then press and hold the Power key.
  3. When the Samsung Galaxy logo shows on the screen, release the Power key but continue holding the Home and Volume Up keys.
  4. When the Android logo shows, you may release both keys and leave the phone be for about 30 to 60 seconds.
  5. You can either wipe the cache partition or do a factory reset when in this mode.

Boot in Download Mode:

  1. Charge the phone for at least 30 minutes.
  2. Press and then hold the Home and Volume DOWN keys, then press and hold the Power key.
  3. When the Samsung Galaxy logo shows on the screen, release the Power key but continue holding the Home and Volume DOWN keys.
  4. Wait until the Download screen appears.
  5. If you can boot the phone in download mode but not in other modes, that means that your only way out may be to flash a stock or custom firmware.
  6. Use Google to look for a guide on how to do it.

Boot in safe mode:

  1. Charge the phone for at least 30 minutes.
  2. Press and hold the Power button.
  3. Once the Samsung Galaxy logo appears, release the Power key and immediately press and hold the Volume Down button.
  4. Continue holding the button until the phone finishes rebooting.
  5. Once you see the text “Safe mode” at the bottom left corner of the screen, release the Volume Down button.
  6. The only difference of safe mode from normal mode is that the former prevents third party apps from running. If you can boot the phone in safe mode but not in normal mode, uninstall all apps until the issue (that prevents you from booting normally) is eliminated.

Remember, if the phone won’t charge at all, thereby rendering the phone totally useless, your only option is to send it in. Contact Samsung to see if you can have them repair it. If this device is beyond the warranty period of 12 months, you’ll most likely pay a fee.

How to fix  “moisture detected” error

You mentioned that the phone may have showed “moisture detected” error so it’s possible that the reason why charging may not be working, and thus the phone does not power on at all, may be due to a wet charging port. Try to shake the phone gently to get rid of water stuck in the port. Also, you can place the device near gentle source of heat like the back of a TV to hasten evaporation. DO NOT place the phone near fire, oven, or exposed it to direct sunlight.

Problem 3: Galaxy S7  black screen issue, won’t power back on

My Galaxy S7 has a black screen even after doing everything you’ve suggested. I only want the voicemails of my recently deceased father and don’t have the money to take it in to a tech. Is there anyway I can retrieve the voicemails if I plug my phone into the computer by USB? Please help! I just want to hear my dad’s voice one more time! — Victoria

Solution: Hi Victoria. Any content kept in the phone’s internal storage can only be accessed if your phone boots normally or to safe mode. If you’ve already done everything including the ones we suggest for Robinrodeeschneider above, you’re out of luck. There must be a hardware malfunction causing the phone boot up. As mentioned above, it can be a battery, a power IC, or the motherboard in general. If you’re lucky and the issue is only a failing battery, replacing it can be an easy fix. You still need to let a professional replace the battery pack though since it’s connected to the motherboard. If the cause of the problem is a failing component in the motherboard like a power IC or the motherboard itself, you may have to let go of those files.

Problem 4: Galaxy S7 not charging, making beep sound when charging


Solution: Hi William. We don’t know the complete history of your device so there’s no way to know what is happening at this time. In a lot of charging issues, the main cause is hardware in nature so make sure to try another set of charging cable and charging box (head) to see if the problem lies there. If a new charger won’t fix the problem, the issue must be found within the phone itself. Have it fixed by Samsung or your carrier’s service center if it remains unresponsive.


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Harvey Hisona

Harvey is keen with mobile technology and loves writing about all things mobile. He is passionate in helping technology-challenged people by finding resolution to their issues. Contact me at Email

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