check the opto board
(Topic ID: 278784)
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Indiana Jones: The Pinball Adventure
Williams, 1993
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LED strips can certainly draw enough current to cause problems, especially on the 12V circuit. I always add a separate 12V power supply with an IOT relay plugged into the service port for mods including a ColorDMD.
https://www.amazon.com/dp/B00WV7GMA2/ref=cm_sw_r_cp_apa_fab_ttHFFb8YQPNHA
Regarding optos it's usually the transmitter that fail first so concentrate on those in addition to the opto boards.
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