S21 suddenly stops working

Question

Samsung Galaxy S21 5G

2021년 1월 발표 및 출시된 Samsung Galaxy S21 5G Android 스마트폰 수리 및 분해 정보입니다.

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Wisdom Togbe @wisdomtogbe

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게시됨: 2023년 6월 26일

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S21 suddenly stops working

So this morning, I woke up and checked my phone for any messages. My phone was working fine then. I placed the phone on my table upside down and went to use my pc. I heard the phone vibrate as my mom called me, but when I picked it up the screen was just black.

After the missed call, I tried pressing the power button, volume buttons, tapping the screen, and nothing happened. I asked my mom to call me again, and the phone vibrated normally, but the screen did not turn on. I force restarted my phone by holding the power and volume down buttons for 7 seconds, and I felt my phone vibrate. I waited for a little bit, but now it seems that the phone just won't turn on at all. No charging symbol, my pc doesn't detect it, and calls get forwarded.

The phone was working perfectly fine before the first call, and there were no signs of any problems with the phone, I've dropped it a couple of times, never spilled anything on it or dropped it in water. Had the phone for 2 years.

Update: The phone powered on, but screen is still black. Does this call for a screen replacement? I just don't get how it just suddenly stops working minutes after I used it

Update #2: I'm able to control the phone and see the screen with the phone link app on my pc. My phone failed the proximity and face recognition tests.

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Please my problem is that my phone screen can go off and turn off while is full charged the screen can't stay long @wisdomtogbe

Roy kellër .E. adjei berko 의 2023년 12월 20일

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jayeff @jayeff

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게시됨: 2023년 6월 26일

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Hi @wisdomtogbe

It could be that the battery has failed or that the there's a problem with the USB charge port board so that the battery can't be charged and as become depleted and the phone cannot be connected to a computer etc.

Here is a composite image from the troubleshooting guide from the service manual that may help. There are also images in the guide which show the location of the parts mentioned in the flowchart.

They show the path to follow to test if all is OK or not

(click on image)

Here's the ifixit Samsung Galaxy S21 5G guide that will help you to access the components in the phone.

If you find this a bit daunting, contact a reputable, professional mobile phone repair service and ask for a quote to repair the phone.

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It doesn't seem to be a battery problem. The phone charges fine. Please look at the post, I've updated it.

Wisdom Togbe 의 2023년 6월 26일

@wisdomtogbe

You initially said that "...the phone just won't turn on at all. No charging symbol, my pc doesn't detect it, and calls get forwarded." so that's why I answered as I did.

Now it does it seems except without a display.

Can you receive calls OK even though you can't answer them or do they still get forwarded?

If everything works except the display then it could be the display - loose flex cable connection perhaps.

Use the ifixit guide to replace the screen so that you can check the connection.

If it appears to be OK then go to p.19 of 67 in the troubleshooting guide to find out if the problem is in the display or the systemboard.

jayeff 의 2023년 6월 26일

@jayeff yeah sorry I should've made sure of everything before posting. I can receive calls. It's possible for the connection to just become loose? Like I don't get how the screen would just suddenly stop working

Wisdom Togbe 의 2023년 6월 26일

@wisdomtogbe

You said that you dropped it a couple of times so it's possible that something has become loose and eventually it finally gave way.

Phones are still reasonably fragile devices when you think about it.

You won't really know until it has been opened and checked

jayeff 의 2023년 6월 26일

Isn't that weird I have the same problem with not being able to interact with the home screen and even the lock screen. My mom just had the same thing happen, but what's odd is she didn't have 5his happen at all before, but after she downloaded spotify and wanted to listen to music her phone like 20 or 40 mins later ended up acting weird and not allowing her to do anything for a few minutes, couldn't even power off or anything then it was fine all of the sudden. Do you have spotify? I'm wondering if spotifys causing the problem.

Ashton Ryan 의 2024년 8월 28일

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Please my problem is that my phone screen can go off and turn off while is full charged the screen can't stay long @wisdomtogbe — Roy kellër .E. adjei berko
It doesn't seem to be a battery problem. The phone charges fine. Please look at the post, I've updated it. — Wisdom Togbe
@wisdomtogbe

You initially said that "...the phone just won't turn on at all. No charging symbol, my pc doesn't detect it, and calls get forwarded." so that's why I answered as I did.

Now it does it seems except without a display.

Can you receive calls OK even though you can't answer them or do they still get forwarded?

If everything works except the display then it could be the display - loose flex cable connection perhaps.

Use the ifixit guide to replace the screen so that you can check the connection.

If it appears to be OK then go to p.19 of 67 in the troubleshooting guide to find out if the problem is in the display or the systemboard. — jayeff
@jayeff yeah sorry I should've made sure of everything before posting. I can receive calls. It's possible for the connection to just become loose? Like I don't get how the screen would just suddenly stop working — Wisdom Togbe
@wisdomtogbe

You said that you dropped it a couple of times so it's possible that something has become loose and eventually it finally gave way.

Phones are still reasonably fragile devices when you think about it.

You won't really know until it has been opened and checked — jayeff
Isn't that weird I have the same problem with not being able to interact with the home screen and even the lock screen. My mom just had the same thing happen, but what's odd is she didn't have 5his happen at all before, but after she downloaded spotify and wanted to listen to music her phone like 20 or 40 mins later ended up acting weird and not allowing her to do anything for a few minutes, couldn't even power off or anything then it was fine all of the sudden. Do you have spotify? I'm wondering if spotifys causing the problem. — Ashton Ryan

Samsung Galaxy S21 5G

S21 suddenly stops working

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