cjs001
Active member
I have two games that are giving me issues on my Neo Geo MVS 4 Slot.
Metal Slug: Green lines on along the left and right side of the screen, but then the whole screen with have green lines sometimes.
King of Monsters: will have vertical lines every .25" on the screen
I thought maybe voltage issues may be a culprit. the 5 volt at the jamma plug metered at 5.26 volts. I then tested the 5 volts on the board at the two points in the attached pictured. That spot measured 5.17 volts. The power supply appears to have no ability for adjustment. The other two games are working normally Aero Fighters 2 and Samurai Showdown (aero fighters sometimes seems to momentarily go into slower motion when there is a ton of activity on the screen, not sure if thats just a quirk of the game). I swapped around the games putting the working ones in the slots where the two problem games where and visa versa. Aero Fighters 2 and Samurai Showdown in their new slots are working the same, no issues. Now Metal Slug instead of the green on the left and right side of the screen, it just has a 1/2" of the vertical image missing on the left and right side, but in that missing image "bar" the image is present for the last 1/2" of that bar at the bottom of the screen. King of monsters in its new slot does not have the green lines now but when the pcb is cycling through the games during demo (set to change every 30 secs) it will not cycle past king of monsters, it just sits at the games title screen.
I did take the games apart and cleaned the connectors with a pink eraser and their nice and shiny again. Is there anything else I may be missing I should try before I see if I can find someone to repair the cartridges. Thank you.
Metal Slug: Green lines on along the left and right side of the screen, but then the whole screen with have green lines sometimes.
King of Monsters: will have vertical lines every .25" on the screen
I thought maybe voltage issues may be a culprit. the 5 volt at the jamma plug metered at 5.26 volts. I then tested the 5 volts on the board at the two points in the attached pictured. That spot measured 5.17 volts. The power supply appears to have no ability for adjustment. The other two games are working normally Aero Fighters 2 and Samurai Showdown (aero fighters sometimes seems to momentarily go into slower motion when there is a ton of activity on the screen, not sure if thats just a quirk of the game). I swapped around the games putting the working ones in the slots where the two problem games where and visa versa. Aero Fighters 2 and Samurai Showdown in their new slots are working the same, no issues. Now Metal Slug instead of the green on the left and right side of the screen, it just has a 1/2" of the vertical image missing on the left and right side, but in that missing image "bar" the image is present for the last 1/2" of that bar at the bottom of the screen. King of monsters in its new slot does not have the green lines now but when the pcb is cycling through the games during demo (set to change every 30 secs) it will not cycle past king of monsters, it just sits at the games title screen.
I did take the games apart and cleaned the connectors with a pink eraser and their nice and shiny again. Is there anything else I may be missing I should try before I see if I can find someone to repair the cartridges. Thank you.
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