In an attempt to lower power consumption, I connected my 17" widescreen LCD to the (unused) 12V motherboard connection. It works, but not without flaws - there is a minor but very noticeable flicker in horizontal lines across the screen. After a little experimentation, I've discovered the following:
Affects the flickering:
Color on screen - solid black and white don't show the flicker but everything else does
Brightness setting - intensity of flickering varies from unnoticeable at 100% to very noticeable at 0%
Doesn't affect the flickering:
Voltage of 12v rail - as reported in 8rdavcore, voltage varies from 11.977 to 12.768v, depending on how much I overclock
Several layers of aluminum foil around connections inside computer
I'd rather not run it at 100% brightness all the time because it's too bright at night and it takes away any power consumption gains I might have made. Anyone know what causes this flickering or other things I could try to fix it?
See this thread for background on my system: Small & Flexible: Back-of-LCD variable power consumption
More details on what I did: I measured the power produced by the LCD's stock brick at ~12.07v. Snipped the cable between the brick and the LCD connector (there were cylindrical shielding things on both ends of this cable, could this be related to the problem?) and put a female molex on it, being sure to observe proper polarity. Replaced the motherboard connector on the PSU (my motherboard doesn't need one) with a female molex. Every connection was soldered and covered with electrical tape or heat-shrink tubing.