Galaxy S7 charging cable and adapter heats up while charging, screen stays black, other issues

Hello and welcome to our new #GalaxyS7 post for the day. The issues covered in this post are not new and considered common to a lot of Samsung Galaxy devices, although they can also be quite ordinary with any other smartphones. We expect that you’ll find this post another helpful material for issues mentioned below.

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 charging cable and adapter heats up while charging

Hi. I have a little problem here. Sometimes when I charge, the cable and charger gets really hot. The end of the cable where you connect the phone and the charger itself gets hot. It happens probably 3-5 times a week. The adapter is original and I’m assuming the cable is too. I just bought the cable from a store here near my place, they said it’s original Samsung cable. Same box, same cord. Almost the same price. The thing is this is only happening for only 1-2 months now. It wasn’t like this when the cable is new. Fast charge is enabled ever since. Do you think I should replace the cable? Thank you so much! — Jett Barleta

Solution: Hi Jett. Extra heat generated during a charging session is normal but if some part/s of your phone becomes uncomfortably warm (and may have accompanying burning smell), that can signal a problem. The chemical reaction in the battery as well as the movement of electrical particles should result to elevation of temperature in the back and charger port parts of your phone but you should still be able to handle the phone fine. If the charger or charging port gets really hot though, you should immediately stop charging to avoid damaging the phone. Heat can kill electronic components pretty easily so any abnormal presence of heat should be stopped immediately.

Check for bent pins in charging port

We’ve seen cases wherein bent or damaged pins in the charging port causes unnecessary heat build up. If you have a magnifying tool that you can use to look inside the port, try to do an ocular inspection and see if something’s amiss. If you can’t do it, you must let a professional inspect it for you.

Lint or debris can also cause connectivity problems during charging as well. If the charging port is dirty, or has foreign objects lodged between the pins, that might be the reason for the heating up issue. In this case, sticking something inside to remove lint or dirt is not recommended as it may damage the pins. Instead, consider using a can of compressed air to dislodge particles inside.

Use another USB cable and adapter

Changing the USB cable may help too. Consider using a known working USB cable and adapter to see if it will make a difference. We rarely see a situation like yours due to a bad cable but it’s still worth checking.

Other hardware malfunction

If the issue won’t go away, there must be another unknown malfunction behind the trouble. It can be a bad battery or any other part. Contact Samsung for support.

Problem 2: Water damaged Galaxy S7 edge won’t turn on, screen stays black

I spilled some water over my S7 Edge but I dried it off pretty quick and put it in my pocket without noticing a change. 20 min. later I try opening my phone but it just won’t start. I put it to charge for about half an hour but then I plug it off and let it be for the night. The next day in the evening I put it back to charge but nothing happens. I checked the SIM Slot and did not find any signs of Water Damage and when i press the Power button + the Volume down button for a brief time, it will show me that the phone charges and that it is at about 0%. What can I do? — My Name

Solution: Hi My Name. A Galaxy S7 can withstand random spills because of its water resistance protection. However, if the only different thing that occurred prior to the problem started occuring is the accidental water spill, there’s still a chance, however small, that moisture may have found its way to some critical components inside. The Liquid Damage Indicator (LDI)  only gets triggered if moisture or liquid touches it or near its vicinity. It’s still possible that the LDI may remain intact even though water may have actually found its way inside the phone for some reason.

Avoid attempting hardware repair by yourself

Unfortunately, there’s no easy way to check if this is indeed the case. At the very least, you’ll have to take the phone apart and see for yourself if there’s any water damage in the motherboard. Opening the phone by yourself will obviously void the warranty so unless you have no plans of letting Samsung check your device, we would suggest against it.

And then, of course, there’s the question of what to do next once you discover that there’s indeed water damage inside. If you’ll see any burnt or damage component, the next logical step is to take that component and replace it accordingly. If you don’t have basic electronic knowledge or training, we won’t recommend that you perform a hardware repair. In a lot of cases, amateurs attempting hardware repair cause more damage than solutions. If you’ll discover obvious signs of hardware damage, you’re better off letting a professional do the repair job for you.

Boot to Recovery Mode and do a master reset

As far as software troubleshooting is concerned, the only ones we can recommend that you do at this time is to see if the phone still powers on. You mentioned that the phone appears to charge when you connect it to a charger though it still fails to turn back on so it means your device must be experiencing a hardware issue. Try to see if you can boot it to Recovery Mode so you can factory reset it. If it won’t boot to Recovery Mode at all, or if nothing positive occurs, send it in.

For reference, here are the steps on how to master reset your device:

  1. Turn off your Samsung Galaxy S7. This is important. You won’t be able to boot to Recovery Mode if the phone is powered on. If you aren’t sure whether the phone is on or not, try to check first if it boots up when you press the power button. If the screen remains black when pressing the Power button, or when connected to a charger, it maybe off.
  2. Once you’ve turned it off, charge it again for at least 30 minutes before doing the rest of the steps below.
  3. Press and then hold the Home and Volume UP keys, then press and hold the Power key.
  4. When the Samsung Galaxy S7 shows on the screen, release the Power key but continue holding the Home and Volume Up keys.
  5. When the Android logo shows, you may release both keys and leave the phone be for about 30 to 60 seconds.
  6. Using the Volume Down key, navigate through the options and highlight wipe data / factory reset.
  7. Once highlighted, you may press the Power key to select it.
  8. Now highlight the option ‘Yes — delete all user data’ using the Volume Down key and press the Power button to select it.
  9. Wait until your phone is finished doing the Master Reset. Once completed, highlight ‘Reboot system now’ and press the Power key.
  10. The phone will now reboot longer than usual.

Problem 3: Galaxy S7 stuck in Download Mode

I have a green download screen on after plugging in the charger a couple of times. It says downloading dont switch off target. Top screen has this: Factory mode download speed: fast product name SM-G390F Current binary: Samsung official FAP LOCK: ON Secure download enabled Warranty Void: 0(0X0000) AP SWREF B1:K0:F0 It has been an hour now with no change. Originally the battery was very Low at 3% and my phone didn’t want to charge at all. This has happened to me before! I took it in and lost all my numbers in my address book. Please help. — Chris Coetser

Solution: Hi Chris. The screen you’re looking at right now is called Download Mode or Odin Mode. It’s a different boot mode used by Samsung technicians to update or modify a device’s software. It only comes up when the right combination of hardware buttons (Home, Volume Down,and Power) are pressed and held in a right sequence. If you did nothing at all and the phone just boots to this mode on its own, that can signal a problem.

Try to see if you can boot the phone to Recovery Mode instead so you can attempt a factory reset. Refer to the steps we provide above on how to do it. If the phone won’t boot to Recovery Mode, contact Samsung so they can check the hardware.


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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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