Samsung galaxy TabA7 constant reboot loop

[Raythebike]

I've tried several methods to break the reboot loop such as tapping, slapping, power cycling, but my TabA7 is still not responding to power - volume down resetting. Any ideas?

 

[B. Diddy]

Welcome to Android Central! Does it still reboot on its own in Safe Mode? www.samsung.com/us/support/answer/ANS00062983/

 

[Raythebike]

To be honest, I'm struggling to know how to get the unit to power off as pressing the power button has no effect.
I can wait for the tablet to fully discharge and then apply charge for 15 minutes or so and try the power - volume down combination which will stop the reboot after about 6 seconds, then after a blank screen and upon seeing the reboot screen I release both buttons, nothing seems to happen.

I also tried pressing the volume down on its own to get into safe mode after realeasing power and volume down, but again the device stayed in its loop.

 

[mustang7757]

Can u get in recovery to perform a factory reset?

Sent from my SM-F721U1 using AC Forums mobile app

 

[B. Diddy]

What happens if you press and hold Power and Vol Down for about 30 seconds (and make sure to time it or count it out)?

 

[Raythebike]

Holding power and volume down will make the tablet screen go blank in about 5 seconds, then blank for a second or so then show the boot screen. At the point I've been releasing the buttons and seeing if anything happens. In all cases it will continue with the boot screen for 45 seconds or so, go blank and repeat.
I can't remember if I've held both power and volume for 30 seconds, will try it.

 

[B. Diddy]

I would also clean the buttons with copious amounts of rubbing alcohol, in case there's some residue stuck in there that's causing one of the buttons to remain stuck in a pressed position.

 

[Raythebike]

I tried holding both power and volume down for 30 seconds and the boot screen went blank every 4/5 seconds and re displayed.
Releasing the buttons left the boot screen on for 90 seconds, blanked for 1 second then repeated.

 

[Raythebike]

Alcohol on the buttons didn't do anything different.

 

[B. Diddy]

What's the model number of the tablet? Is it still under warranty? It sounds like either corrupt firmware or faulty hardware.

 

[Raythebike]

Model sm-t500. Bought March 2021.
How difficult is it to remove the back to reset the battery?

 

[B. Diddy]

Here's a teardown video:

https://www.youtube.com/watch?v=dpW4_Vc1gnA