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DMD drops out consistently during gameplay, then returns
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Question
robm
Have a workmate with a Fishtales with an intriguing problem. I recently had the Fishtales in my comp, and it ran for 8 hours straight without a drama.
He told me the display was blanking out and not working, so i went and had a look and put a new DMD driver in since the one in there had no 60V.
With new DMD driver, all DMD voltages are good and display is sharp and bright, however:
Upon power on, it says testing, then once testing is complete, the screen goes blank for 5 seconds, then comes up normally in free play.
Start a game, everything is good, until you lock a ball - screen goes blank (all sounds play), until after ball is locked. Also, EVERY time you catch a fish (ie: hit the 4th standup) the screen blanks out for a few seconds. Also, during multiball, it stayed blank (except when you light the LIE for a bonus - that animation appears) until multiball was over. It appears to me, that the display freezes at specific sound grabs rather than specific switches or coils firing - is this possible?
I am doubtful it is a DMD driver RAM issue, since i used a tested working board in it.
I have reseated ALL ribbon cables, as well as pushed firmly on game ROM and ASIC chips.
I removed the sound board connections.
It is still showing the above symptoms. My next step was going to swap MPU boards and/or game ROMs - does anyone have any other suggestions or had a similar experience?
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