Tron pcb trouble

Mr Do

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Donor 6 years: 2012-2013, 2015-2016, 2019, 2025
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Tron turns on with garbage on screen. Sound board thump can be heard when game turned on. 5.02 volts on pcb. Test mode just shows colored purplish screen with some thin line.
Any ideas?
 
Tron turns on with garbage on screen. Sound board thump can be heard when game turned on. 5.02 volts on pcb. Test mode just shows colored purplish screen with some thin line.
Any ideas?

Swap out the Z80 with the sound board and see if it helps.
 
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