Then there is . This is a virtual unit used by developers to ensure an app looks the same on a small phone and a large tablet.
is a physical measurement. It is calculated based on the resolution of the screen divided by the physical diagonal size. A Galaxy S23 Ultra has a resolution of 3088 x 1440 and a 6.8-inch screen. Mathematically, that results in roughly 500 PPI. This is set in stone by the physics of the hardware; it cannot be "invalid" unless the screen physically changes size. invalid ppi samsung
Before you junk your Samsung printer, attempt Fixes 1, 2, and 3. You have an 80% chance of recovery. For the remaining 20%—a dead mainboard—a replacement is your only path forward. Then there is
Then: