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Donkey Kong TKG-4 Sprites not displaying consistently, flickering
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Question
dedmunds
Hello all
I have been finishing a DK build and am getting to a few final little issues.
My main problem left is that the sprites for the game don't display consistently. They tend to 'flicker' on, stay for a moment then disappear, so on.
After the cabinet has been powered on between 5-15 minutes, sometimes the display of sprites comes good, and i can play no problem.
Who has experience with this kind of issue or possibly a link to any similar cases that i could check?
I have had a browse but i haven't come across anything for this unless I have missed something.
I'm pretty keen to understand what any potential causes may be or if anybody's got any suggestions.
So far have:
- Noted self-test from High Score board finds no Video RAM or CPU RAM faulty (all ok)
- Confirmed that all text reads perfectly on screen, only issue seems to be with game sprites
- Cleaned board connections for EPROM's
- Removed, cleaned pins and reseated all ROMs (some were horrible), I noted processor chips had very blackened pins, so they been getting hot...
- Confirmed +5, -5, +12 VDC, +12 is reading high but +5 is right on, I believe 5.09VDC at edge connector at last check
NOTE: When fiddling with V-Hold and H-Hold i feel this made some difference, but honestly I have messed with it that much I suspect this could have nothing to do with it.
I may be going nuts but i sure am learning a lot!
Thanks everyone,
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