Carputer Monitor Flickers.. Some type of noice / interference?
I need some suggestions as to what could be causing my LCD Monitor to randomly blink on/off for a second. I have a 10.4" Shark (samsung lcd) touchscreen that I molded into my dash bezel. It worked great for about a year with no issues at all, now while driving around, randomly, the screen will just "blink" or cut off and then back on real quick. Its like the power goes on and then off because the monitor even displays the input icon showing that vga is connected like when you first turn the screen on or change inputs. It does this randomly, sometimes many times in a row, sometimes just once or twice while driving across town. I am using a Jetway mini-itx motherboard with onboard video and a M2-ATX power supply.
First off a few notes: It's not a loose wire. All my wires are soldered and have been tipple checked. The problem occurs even while sitting still at a stop light and not in motion at all, but also seems to occur more frequently when I am accelerating or taking off. My alternator is a new 200watt alternator and puts out steady clean power. Also, I have other things in my center console with the carputer motherboard such as a wireless switchbox and a wired switchbox for my air-ride suspension that I have on the truck. Also, this random blink problem only occurs when the truck is running and it does not seem to occur on the monitors other input such as the composite video cable coming from my dvd player thus making me believe it's not a power cable issue. Now, when I use my wired switch box to adjust the air-ride on the truck (to open and close the air valves) that usually will immediately cause the screen to blink and always has, even before the random blink problem started. So there is some type of interference that I would like to eliminate as well, but I have now idea how too and don't think it's causing the random blink problem because the random blink occurs when I am not using the switch box in any way. Also, the carputer and my switchboxes are running off a direct power cable from the battery and are grounded to the body of the truck through the bolts that hold in the center console.
What I have tried:Originally I had the power and ground for the LCD running directly off the M2-ATX power supply. I figured that maybe there was some type of power issue there so I ran a power/ground cable set directly from the batter to the monitor and put it on a relay so it would turn on/off with the carputer. This didn't help the blink problem at all. Originally I also had the power wires crimped, I went back and soldered them all to eliminate a loose connection. I also thought there could be a power/monitor cable interference issue so I went back and ran my monitor cable/audio cables down once side of my console and ran all my power cables down the other side of the console, this didn't help either and I still get some interference on my monitor cable (some faint horizontal lines). I am thinking that maybe it's some type of ground interference with the carputer/motherboard that somehow affects the vga output on the motherboard. Is there a way I can sort of "clean" the power before it gets to the carputer motherboard or make sure now feedback is coming from other stuff on the truck through the ground? I have heard of ground-loop isolators but am not sure how they work, where to get them, or exactly what they do.
So if anyone could help me out with some suggestions here that would be awesome because I am about at witts end here with this thing!