Tablet-The half of screen has Black-White lines and the other is good

"There are guides on iFixit that will show you how to remove the screen.

Samsung Galaxy Tab S3 Display Replacement

As someone else said, rice doesn’t really do anything besides make a huge mess. To clean corrosion that has built up on connectors use some isopropyl alcohol (at least 90%) and a toothbrush to clean any corrosion from the logic board. Use a hair dryer after brushing the logic board to get rid of any moisture then attempt to connect the screen again. If the problem still exists then there is likely either damage to the logic board or the screen."

To remove corrosion take a tooth brush and rub it carefully. If your tablet still does’t work then your LCD must be replaced. Before you purchase any parts (if you need to) send a picture of where the corrosion is.

"I had this on my Galaxy Tab S3. Progressively got worse until I had nothing shown on screen at all.

The fix for me was open the back, and clean the corrosion off the wide display cable terminals.

VERY GENTLY scraped it off with a small flat head screw driver then rubbed with some windex. Put it back together and now it works perfectly

Be very careful cleaning the terminals, the contacts are very thin and it would be very easy to scrape the copper off

Before clean

After clean"

https://eu.community.samsung.com/t5/tabl...