Hello - My Gilligan's Island machine recently developed a problem where when I power it up the screen displays garbage and nothing else happens (no sound and no lights). I disconnected the ribbon connector at J202 at which point the machine will power up and is playable with the exception that the screen still displays garbage and the sound does not work. I took the display controller board to a somewhat local guy and he thought it might be either the ribbon cables or the board itself. He replaced the RAM on the board and I replaced all of the ribbon cables. Unfortunately the problem persists. Before I pack the machine up the basement stairs again I wanted to see if anyone had other thoughts on what I might try. I can supply pictures if that is helpful. Thanks in advance for the help!

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Test point readings:
5 volt tested at 5.04
12 volt tested at 11.90
20 volt tested at 22.7

I also checked voltage on the RAM and it was 5 volts. So I went back to the MPU and checked the ROM chip and its at 4.8 volts.

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