Got a pretty annoying situation with my C32H70 (Samsung QLED 32" Gaming Monitor).
Getting really bad horizontal lines that would appear at the bottom and sometimes the whole screen on cold start up.
I took a week long vacation and came back to my monitor (full screen) with very very very bad horizontal lines that made it impossible to see and operate my computer.
As the monitor warms up the lines disappears.
On the links provided below shows what I am experiencing every now and then. It is more prevalent when my monitor hasnt started up for a couple days.
I took the display port cable out to see if the problem persist and the horizontal lines stayed when the display port was pulled out.
Is there any kind of help that Samsung would provide? I hear this a issue with QLED gaming monitors are experiencing and Samsund is not does not have a remedy for it.
Unfortunately it seems to be a trait of these monitors! I have had 2 of this very model and both developed the same issue!
First one was in warranty and replaced, 2nd one just out of warranty and now in my garage!
Exactly as you described, after a day or two of no use, I'd get horizontal lines that would go after a period of time.
For a monitor of that price you would hope it wouldn't develop something like that for a long time.
It'll be the last samsung monitor I ever get and everything in my house is Samsung!
Sorry I could not provide anything but sympathy!
The unfortuneate this is as monitor warms up, the horizontal lines go away. Pretty annoying if my monitor has not been turned on for a couple days that the monitor rendered useless until it warms up.