mecha
Well-known member
Monitor brighter at the top part IV (put your thinking caps on)
okay, tl;dr time again.
I have this one Midway cab (of the War Gods-spraypainted-black variety) where any monitor you install in it has the top inch of the screen that's brighter than the rest. presently it has a WG U5000 in it, until I get off my lazy ass (not really) and head to a UPS store to send my Polo back to Chad for intensive care. the Polo you could actually see retrace lines in this section. now you can turn the brightness down enough to where it's barely noticeable, but this makes the screen too dark to see anything.
I've made probably 3 threads pertaining to this over the past couple years.
I traded out ALL the wiring inside the machine and replaced them with other parts that were working pulls from a KI I got on ebay (for a whopping $10). some encouraged that maybe the JAMMA harness was at fault for this, and I figured replacing the stupid non-iso power block with an iso and using the supplied wiring with it would get it. so, I repeat, the only thing that's the same is whatever's in the coin door and the monitor itself. I replaced EVERYTHING else.
it didn't make a difference, the iso. in fact, I even had ghosting in the picture, but a little snip of the earth ground to the monitor corrected that. why does that happen anyway? it didn't do it with the old non-iso block, but now it does it with the iso. I replaced the cord on it with a brand new one, so why would this be a problem? all the other earth ground wires are connected to where they need to go too. also FWIW, for the first time ever, I actually jumpered the earth ground to the synthetic ground on the screw terminal PSU (also brand new Happ PowerPro)... I think it did the ghosting before I did this though.
now, the last possible item I can think of that's causing the brightness at the top issue has to be the actual top monitor mounting brackets causing some kind of interference or something. the real proof in the pudding would be if I pulled the monitor and tried running it on the floor, but as I already mentioned, I replaced every single wire inside the cab lol, I even changed the power switch.
the marquee light and speakers as far as I can tell have no bearing over this, as I have removed/disconnected them from the machine. the speakers are factory and are unshielded as far as I can tell, and they don't affect the monitor at all where they're mounted, so they probably wouldn't have had anything to do with it anyway. I've even removed the speaker grill, still no change.
the monitor mounting brackets are not magnetized at all. there were no other strange artifacts hidden inside the cab that I saw, so if wood has this kind of effect, then maybe I should donate this thing to science.
thanks for reading if you made it this far. now help me somehow.
okay, tl;dr time again.
I have this one Midway cab (of the War Gods-spraypainted-black variety) where any monitor you install in it has the top inch of the screen that's brighter than the rest. presently it has a WG U5000 in it, until I get off my lazy ass (not really) and head to a UPS store to send my Polo back to Chad for intensive care. the Polo you could actually see retrace lines in this section. now you can turn the brightness down enough to where it's barely noticeable, but this makes the screen too dark to see anything.
I've made probably 3 threads pertaining to this over the past couple years.
I traded out ALL the wiring inside the machine and replaced them with other parts that were working pulls from a KI I got on ebay (for a whopping $10). some encouraged that maybe the JAMMA harness was at fault for this, and I figured replacing the stupid non-iso power block with an iso and using the supplied wiring with it would get it. so, I repeat, the only thing that's the same is whatever's in the coin door and the monitor itself. I replaced EVERYTHING else.
it didn't make a difference, the iso. in fact, I even had ghosting in the picture, but a little snip of the earth ground to the monitor corrected that. why does that happen anyway? it didn't do it with the old non-iso block, but now it does it with the iso. I replaced the cord on it with a brand new one, so why would this be a problem? all the other earth ground wires are connected to where they need to go too. also FWIW, for the first time ever, I actually jumpered the earth ground to the synthetic ground on the screw terminal PSU (also brand new Happ PowerPro)... I think it did the ghosting before I did this though.
now, the last possible item I can think of that's causing the brightness at the top issue has to be the actual top monitor mounting brackets causing some kind of interference or something. the real proof in the pudding would be if I pulled the monitor and tried running it on the floor, but as I already mentioned, I replaced every single wire inside the cab lol, I even changed the power switch.
the marquee light and speakers as far as I can tell have no bearing over this, as I have removed/disconnected them from the machine. the speakers are factory and are unshielded as far as I can tell, and they don't affect the monitor at all where they're mounted, so they probably wouldn't have had anything to do with it anyway. I've even removed the speaker grill, still no change.
the monitor mounting brackets are not magnetized at all. there were no other strange artifacts hidden inside the cab that I saw, so if wood has this kind of effect, then maybe I should donate this thing to science.
thanks for reading if you made it this far. now help me somehow.