Aladdin2
Beginner
I used to operate arcade and pinball games and dug out one of my old PCB's that I do not recall how I came to own. I wired up a test JAMMA harnes and connected and old crt game monitor, control panel and power supply. The power supply was a piece of junk that killed my Sega Altered beast board by an over voltage output caused by defective 5V and 12V power supply chokes.
I have been working on my two board set of "The Final Round" that looks like somebody already tried to repair. The issue is there are vertical lines in the video but red, green and blue color palette looks good. The GX870 main board is silk screened "GX870 PWB351311A" and the rom board is silk screened "PWB350958 ROMBOARD 34M". All RAM and ROM tests pass diagnostics but I think there is a defective static ram someplace. Does anyone have an idea which location on the board is the issue? The main board will display blocks of an overlay with lines in the video thus narrowing the issue down to the main board.
I have been working on my two board set of "The Final Round" that looks like somebody already tried to repair. The issue is there are vertical lines in the video but red, green and blue color palette looks good. The GX870 main board is silk screened "GX870 PWB351311A" and the rom board is silk screened "PWB350958 ROMBOARD 34M". All RAM and ROM tests pass diagnostics but I think there is a defective static ram someplace. Does anyone have an idea which location on the board is the issue? The main board will display blocks of an overlay with lines in the video thus narrowing the issue down to the main board.
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