RollerCoaster Tycoon
Stern, 2002You're currently viewing posts by Pinsider markmon.
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Quoted from Paul_from_Gilroy:I carefully replaced the 74HCT273N. Used flush cutters to cut out the old IC, and a Hakko FR300 to clean it up. That went smoothly, but the result... no change, same problem as before. I guess that means the problem could be anywhere on the data bus. Dang. Kinda wish I owned another Whitestar game so I could at least swap boards to isolate it to the board level :-/
Didn't you already isolate it to the board level by disconnecting the j12/j13 and using gator clips?
Quoted from Paul_from_Gilroy:Only rows 6 and 7. I completely disconnected the playfield (J12 and J13, rows and columns) and tested Row 6 with a lamp and alligator clips. Same thing. When Row 7 is active, Row 6 lights-up too, just not as bright. I replaced the Mosfet at Row 6, and even replaced the Mosfet at Row 7 for laughs and giggles. No luck. I plan to replace the next component upstream, the 74HCT273 next... however, I've never seen one go bad before.
When you did your lamp alligator tests, I assume there were no diodes. So ghosting would be expected. Did you also try the same alligator tests on other rows and see that the problem did not exist?
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Hillsboro, OR