Chosen Solution
I had a bad driver/main board in my Acer S231HL (the monitor was dying periodically and then eventually stopped turning on at all), and ordered a replacement. After hooking up the replacement, I did a test run and it worked perfectly. I reassembled the monitor, hooked everything up, and celebrated… except that after 2 minutes, I started getting some flickering, then random colors, glitches, fullblown full screen colorful HDMI snow, vertical lines… it was like it was trying to pick a defect. Eventually, it settled on showing the display, but leaving a bunch of thin vertical lines across the screen that are black-ish with a few tiny pixels in each that change colors sometimes. Sometimes the screen goes fully black. When the monitor displays lighter colors, like a webpage with a white background, you can also see wider colored lines that are flickering constantly and changing colors.
This means the driver board they sent me was functional but then went bad after a short amount of use, right? Not like the LVDS/LCD cable or something? The board has no visibly puffy/leaky/blown capacitors.
The board was a 715G3603-M02-000-004L, which at this point is now impossible for me to find for anywhere near the price I paid ($15). Thinking I might have to recycle the monitor at this point; cheapest available board is $43.
@adinga when you say the lines go across it is important to know if they are horizontal or vertical stripes. This could be a bad driver board (the board on the actual panel not the main board)or a bad panel. Post some good pictures of what your monitor display as well as pictures of your boards and the back of the panel (label) so we can see what you see. Adding images to an existing question
