Board was in good shape but completely dead, it gave nothing on screen when powered up.This Konami hardware uses a couple of custom ASICs (marked '055673' and '055555') with very fine pitch whose pins most of time lose contact from pads preventing the board from booting.Sure enough I inspected the '055555' for first:
I found on it amost a whole row of lifted pins :
Promtly reflowed :
This made the trick!
Board risen from its grave and fully working again.Repair accomplished.
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