Sega Thunder Blade arcade game lockup

racerxsel

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Donor 2014
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May 9, 2014
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Connecticut
My 1987 Sega Thunder Blade upright arcade game is locking up intermittently. The game powers up, it will play for 1 - 10 minutes then the screen locks up. The controls do not respond, the screen is locked onto the last image that was displayed before it locked up, the sound will continue to play. The only way to get the game back is to power the game off/on. Then the game will coin up and play again, and lock up again, after a period of time.
The game will also lock up in attract mode. It locks up on different screens.
If I run the diagnostics, before it locks up, both Ram and Rom passes.
I have reseated all the socketed Roms and all the other chips on the Sega main board.
How can I fix this game from locking up? Any ideas on what to check, test, to get it to work reliably?
Any help is appreciated,
RACERXSEL
 
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