A70 screen will not dim/USB connection.

[AndrewTanner]

Hey,

I've noticed a problem with my A70 regarding trying to dim the screen when locking manually or expecting it to lock after screen timeout.

Basically, my phone won't sleep, at least not whilst charging. I spent a good while playing around with settings on my phone, such as timeout and lock screen settings. I also powered off the device but no luck.

After trying to figure out the problem further I discovered that the notification tray is being constantly updated every few seconds swapping between "Android system USB connector connected" and "Android system USB connector disconnected". So presumably this is what is keeping the phone awake as it thinks it is being constantly connected and disconnected from source USB source. I cleaned out the USB port but it was pretty clean to begin with. I'm not getting any notifications regarding any moisture detection.

The A70 charges just fine (though sometimes there is a slight delay to it recognising being plugged in) and it seems that the USB tethering interface is working well as I can use the remote debugging feature in Google Chrome (for web development purposes) just fine. As far as I can tell, there are no actual issues with the USB port - it functions as I would expect.

The A70 was last updated on the 14th August to "Security Patch level: 1 July 2019" and looking over the log of updates I see that "The charger/USB port's moisture detection algorithm has been improved" - so someone somewhere has been looking at this feature and I doubt it coincidence that my device has just developed a fault, given that I've not had it anywhere near moisture or excessive dirt.. and the port still actually works!

I've also tried Safe Mode but the issue persists. Also, if I power the device off, then plug it into the wall, power it on, the notification issue stops... until I unplug it/switch off the wall socket - then it comes back again.

Anyone else having similar problems?

[thewhitty]

https://www.homehardware.ca/en/150g-electrical-contact-cleaner/p/8618888

I haven't has the issue return. 

[blitzsnake]

Hi all. A temporary "solution" to this issue is simply finding the smallest USB-C adapter you can find and just hook it in the USB-C port. It doesn't have to be a charger. That should atleast allow the screen to dim properly with the only issue being a small USB-C adapter attached. I just did this on my Samsung S9 and it worked. Next I'll try the electrical contact cleaner trick and report back. 

[brazio]

So... i had this problem in october 2019 and after I tried to fix it with things I read here nothing worked. I took the phone to the store I bought it from (the phone was 2/3 months old when the issue occured) and they sent it to warranty. 

The warranty covered the issue and they replaced the charging port. It fixed the issue.

Until today. A year and a couple of months later here is the issue again. It is really annoying and I am super dissapointed with this phone. I have to take it to the phone store again and take it to warranty again since it is not 2 years old yet.

Anyway, if you have this issue and you can't fix it yourself take it to warranty and they'll fix it. However, after a while it may show up again.

[Hamham]

You've saved my life. Cheer pal!

[Dbflex]

Just a note to say I was experiencing an identical problem with my S10 Lite and this solved it. Thank you.

[ColeFire]

I found a workaround for anybody interested:

No thanks to the abysmal Samsung support, completely ignoring 554 replies, all of which I've read through. 

I found an app called "Black Screen - Play videos with screen off" that reliably turns the screen to black. Image here

It creates a pop-up padlock icon on your home screen for convenience, and presents an "Unlock" button when you tap the black screen. Samsung is ignoring us so this is the best I can offer. Please let me know if it works.

[robygalaxi23]

My fon it's the best