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?

[Hailey123]

What have you done mine works 2 but drains battery really quickly 

[Shan66]

I'm so far not getting the notification pop up with the screen flashing non stop. I'm not sure if this is a permanent fix. I basically done all the troubleshooting mentioned in this thread. First, unlocked developer mode. -Scrolled to "default usb configuration" selected "charging only" (even though this was done already, I changed it to transfer files, reboot the phone and then selected charging only), once the charging only is selected I done the next below -Someone mentioned dialing *#0808# and selecting the last option then tap on Reboot. Once the phone rebooted, I actually had my device shut down for a good 20 minutes. Until my screen had that brand new cold feeling (which I haven't felt in awhile since this issue), I switched my phone on and no Android System USB notifications...so far though.. it's been about 4+ hours, and still looking good. Hopefully tomorrow will be the same

[Keeara]

I did the last update (on Thursday) and then i did Volume Down + Power

Since then the phone is working without any issue

[Hailey123]

[Hailey123]

You see that when you finger down

[Keeara]

No more after the thing i did. It's working normally without any notifications and any issues with the lockscreen. The battery works fine

[Hailey123]

For me no luck i have done the same as you 

[Shan66]

I have tried the above and repeated so much, I spent most of my morning trying to get this right. After repetition, I no longer get that Android system USB notification..however, it hasn't been a full day yet, and I avoided playing games much and using my phone like I use to. I will keep you updated tomorrow, as the first troubleshooting I done when this happened was unlocking developer mode-USB configuration-change to charging only and and my phone worked fine until yesterday, which lead me to come back online to research, then found that *#0808# trick here, which I just incorporated in the change to USB configuration plus added my own by leaving the phone off for awhile, until your screen is cold like a brand new device. I just hope it still works tomorrow morning

[Shan66]

I have tried the above and repeated so much, I spent most of my morning trying to get this right. After repetition, I no longer get that Android system USB notification..however, it hasn't been a full day yet, and I avoided playing games much and using my phone like I use to. I will keep you updated tomorrow, as the first troubleshooting I done when this happened was unlocking developer mode-USB configuration-change to charging only and and my phone worked fine until yesterday, which lead me to come back online to research, then found that *#0808# trick here, which I just incorporated in the change to USB configuration plus added my own by leaving the phone off for awhile, until your screen is cold like a brand new device. I just hope it still works tomorrow morning

[huryhoy]

My phone's screen is now working properly. It dimmed as the way it is. But the USB notification is still there.

What I did was:

1. Full Backup

2. Reset to factory settings.

3. Reboot and restore

4. Let the phone restore everything including all the apps installed.

5. Use the phone until battery empty. As in totally drained off.

6. Charge the phone without turning it ON. Wait for it until fully charged. 

7. Clean the USB port with a toothpick.  

8. Apply developer mode USB Configuration to Charge Only. Reboot

9. Apply *#0808#. Reboot

10. That's it.

I did this last night and phone until now is still fine.

The Android System Notification USB Connector Disconnected is still there, but the screen is now working fine as it was. Dimmed after a couple of seconds and won't lit up until I will use the phone. Battery as well is also working normally. From 100% last night 10:00PM, played PUBGM until 2:00AM, and the battery now as I'm typing this is, 57%.  

Hope the procedure above will also work with you guys. This is still under observation though.

Thanks!