tec9
Active member
Hey all-
I got a Robotron machine that has a slight issue. It has a small amount of video garbage that is on the screen most of the time. The garbage is right below the border of the stages. The garbage is not on the screen during certain test modes, so I don't think it's a monitor problem. (monitor was rebuilt) The game does not report any errors, and plays fine. I did a quick swap of some parts I had lying around, and I have verified that the ROM board is good. It is running the original power supply and my voltages are close...about 4.94VDC, and -5V is spot on. I believe the problem is on the CPU PCB. I have swapped all the socketed chips on the PCB, and the video garbage remains. Any ideas or suggestions? I plan on buying the power supply rebuild kit, but was wondering what else would cause this?
-Mark
I got a Robotron machine that has a slight issue. It has a small amount of video garbage that is on the screen most of the time. The garbage is right below the border of the stages. The garbage is not on the screen during certain test modes, so I don't think it's a monitor problem. (monitor was rebuilt) The game does not report any errors, and plays fine. I did a quick swap of some parts I had lying around, and I have verified that the ROM board is good. It is running the original power supply and my voltages are close...about 4.94VDC, and -5V is spot on. I believe the problem is on the CPU PCB. I have swapped all the socketed chips on the PCB, and the video garbage remains. Any ideas or suggestions? I plan on buying the power supply rebuild kit, but was wondering what else would cause this?
-Mark