Game was working fine then one day decided not to boot. The -17 MPU LED does not flicker; just comes on solid at power up. The brown sockets have been replaced and there is no corrosion on the board.
I replaced U7 through U11 with known good chips and nothing changed. Solid LED, so assumed the game ROM's were bad.
I modified/jumpered the -17 board to accept two 2732 ROM's and purchased a set for Evel Knievel. Tested them in another board, so they are good.
Now, I have installed only U6, U9, and U11, all known to be good. No flicker, only solid on.
I briefly shorted U9 pins 39-40. LED stays solid on.
Can I get some troubleshooting help? ...looking for a flicker! Thank you...