If you unplug the tablet from the pc or the charger and the red x was present the red x will go away because no chargers are being detected.
Samsung galaxy tab charge red x.
Get it as soon as tue sep 22.
The solution that worked for me.
One of our customer brought in samsung galaxy tab e model.
Quick charger compatible samsung galaxy tab s4 10 5 2018 tab a 10 1 2019 tab a 10 5 tab s5e tab s3 9 7 tablet charging cord ul listed extra long 6 6 ft cord adaptive fast charge black 3 9 out of 5 stars 107.
I had the red x problem with my tab 12 2 even though i was using original correct 5 3 volt charger and cable compared to galaxy note 4 s 5 0 volt charger.
All computers usb ports are regulated at 5 0v.
The red x will only appear if the charging voltage is less than 5 3v.
That being said this part is very important if the red x is driving you nuts.
With tablet on and unplugged hold down power button briefly enough so not to turn off tablet to plug in cable then release power button.
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When i connect my charging cable i hear charging sound but with this x mark it is not charging.