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Samsung's tenth flagship Galaxy phone, released in March of 2019. Shipped with Android 9.0 (Pie).

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Phone became completely unresponsive. (not wet or dropped or battery)

My Samsung Galaxy S10 never had issues, was fully charged and just basically crapped out. It froze at one point while using it, then the screen looked as though it was just turning on, then black, then turning on, then black a few times. Eventually it just wouldn't do anything. I've tried all combinations of Force Restart buttons, while unplugged and while plugged in. I've also opened the phone (for the first time) and unplugged the battery, then replugged, thinking maybe this would force a boot. Still just unresponsive. No vibration, no power indicator light, nothing.

I bought and tried a new battery by disconnecting the old battery and clipped in the new battery. (I did not 'remove' the old battery, and I did not close the phone). Still nothing.

I've searched iFixit, youtube, the internet, etc.. but can't seem to find anyone describing my exact issue / symptoms. I see that I can replace the screen, but with no power indicator and no vibration, I don't think a new screen would be the fix.

Can anyone suggest a better way to diagnose my phone to identify what it needs?

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Hi @hanoiboi

Here's the service manual that will help.

Go to p.58 Sect. 8-4-1. Power on and follow the troubleshooting flowchart and check if that helps to find out what's wrong.

The board layout diagrams are on p.56-p.57. You will have to keep zooming in to find the components mentioned in the flowchart.

If you go thru the flowchart and you do find a faulty component the parts list is on p.13→p.27.

In there you will find the component and the part number for the part. Search online for Samsung (insert part number) to find suppliers of the part.

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2 Comments:

Hey jayeff,

Thanks so much for your quick reply and the link! I've been trying to figure stuff out following this.

I checked the original, currently installed, battery's voltage by using the 9V setting on my multimeter and I see 2.75. The 'new' battery that I have not installed reads 3.75. The workflow suggests replacing the battery if under 3.5V, but I have to think that the battery isn't the problem (should I not be thinking?). Remember, if I disconnect the old battery and connect the new battery (but not seal up the phone) I see the same symptoms - absolutely unresponsive.

Assuming it's not the battery, my next workflow states:

" <When pressing Power key, check if the Power key FPCB pad on front is shorted>"

Any idea 'how' to check if the power key FPCB pad is shorted? Is the FPCB pad the piece that plugs the power button into the motherboard?

Thanks once again, and sorry for the additional questions. I don't necessarily want hand holding, but sometimes it's very helpful...and much appreciated.

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@hanoiboi

Can you check if the power button (examples of button) actuating pin is OK and not broken off etc and is actually pushing on the contact when the button is pressed and also that it is not permanently pushing on the contact keeping it operated all the time, even when it is supposed to be released?

To test it you would have to disconnect the battery fromthe phone and then access the contact which the button operates and then place an Ohmmeter on the two connections coming from the contact.

Initially you will get a resistance reading on the meter (I don't know what value) as the contacts are connected to other components on the board, but when you manually operate the contacts simulating the button operation the resistance value should change to show 0.00 Ohms i.e. a short circuit.

If it doesn't change then the contacts are faulty. If it shows 0.00 Ohms then move on to the next step in the flowchart

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HanoiBoi will be eternally grateful.
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