area 51 maximum force duo

RAVEN1708

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I have an area 51 maximum force board that has a video sync problem. I know the monitor is good and checked the wiring. I swapped it with an area 51 site 4 board and it works fine. I am lost on what would need to be replaced on the board.
 
Put a logic probe or oscilloscope on the sync line. If it's stuck low then follow the trace backward to the offending chip.

I have an older model Area 51 board here for Raiden2112 that has a dead 7406 IC that was supposed to be driving the sync output. I have it on order from Mouser.
 
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