who can test a Game prom?

maddog14

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my gottlieb system 3 board wont boot. just one of the things i want to test. my u5 is not testing the same as my u4 with my logic probe. those i have spares of. might try socketing a replacement tomorrow
 
could a bad lm339 on a gottlieb sys 3 board

cause the board not to boot? the u21 tests different with logic probe than the other two and ties in with the slam and tilt
 
my gottlieb system 3 board wont boot. just one of the things i want to test. my u5 is not testing the same as my u4 with my logic probe. those i have spares of. might try socketing a replacement tomorrow

Where are you in IL? I am in Sourthern Wisconsin and have a ton of System 3 stuff and system 3 games (they are my guilty pleasure)... I also have a rom burner and can check/verify/burn you another rom if needed.

Which System 3 game are you referring to- is it alphanumeric or Dot Matrix? If alphanumeric, you can test the CPU by itself for boot, if DMD, you must have a working DMD controller board (directly above the CPU) with a known good GAL Chip or you probably won't get the CPU to boot as it reads the code from the DMD board for proper boot procedure.
 
hey there. i am in moline. i am working on a operation thunder. alpha numeric. my board is deAD. got it in the bunch now testing what chips i cAN WITH LOGIC Probe. if i am reading it correct, so far i have a bad u10, u14, u15, maybe one bad u21, perhaps bad U5, BUT DONT HAVE info to verify readings,, u 11 seems to be in spec. put in a brand new u3 with a 28 pin and jumper swap getting rid of the 24 pin.

board on bench almost seemed like it wanted to boot with the 24 pin u3 but no dice in game.

just solid red light on the board
 
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