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.
Samsung galaxy tab charge red x.
All computers usb ports are regulated at 5 0v.
That being said this part is very important if the red x is driving you nuts.
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.
When i connect my charging cable i hear charging sound but with this x mark it is not charging.
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The solution that worked for me.
The red x will only appear if the charging voltage is less than 5 3v.
Samsung galaxy tab 1 2 3 10 1 a e etc if you are having a hard time with your samsung galaxy tab you should read this blog post.
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.
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.
The device then does not charge because of the low power or amperage of the charger.