Donkey Kong graphic glitch

digitalwack

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I just noticed a tiny graphical glitch on my Donkey Kong. It is a tiny virtical line around a half inch right above the ladder closest to Kong on the barrel board. Sorry for the poor picture! Any suggestions?
 

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I just noticed a tiny graphical glitch on my Donkey Kong. It is a tiny virtical line around a half inch right above the ladder closest to Kong on the barrel board. Sorry for the poor picture! Any suggestions?

Weird... I don't know about that one... with a chip issues (either ROM rot or poor contact) you'd expect to see it in both ladders (at least I would)...

With Nintendo ROMs being what they are (... seriously... go through the trouble of putting stickers on all the ROMs but don't bother covering the windows? ... really?) I'd pull all the ROMs and read them and run them all through ROMIdent to make sure they're all good and you don't have some ROM rot.

BUT, just to double check before all of that... if you move the picture left or right does the line follow the ladder or just stay on the screen where it is. If it does, could be a defect in the phosphor on the monitor.
 
Weird... I don't know about that one... with a chip issues (either ROM rot or poor contact) you'd expect to see it in both ladders (at least I would)...

If the bit rot was in the ladder graphic, you would see it in both (all?) ladder graphics. This looks like a single tile is pointing to a bad location so the bit rot is in the definition of what tiles make up the background.

Options:
1) Verify your graphics EPROMs
2) Reseat your graphics EPROMs
3) Ignore it! :)
 
Donkey Kong 2 board set expert needed

I just replaced all the proms as well as all the eproms on my 2 boardset Donkey Kong. I'm still having the same graphical issues as before, so rom rot is now 100% out of the question. I'm hope someone may be able to point me in the right direction. I'm only having issues on the barrel board. Here are some updated pics. Thanks!!!!!
 

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Garbage, misc sprites above the ladders are usually one of the two 10422 ECL rams. They are the two with the aluminum heatsink glued on them.
Typically this shows up after the game warms up and gets worse as the rams heat up.
http://www.twistywristarcade.com/ram/655-mb7072-hm10422.html
No guarantee that this will fix yours but I have seen this a few times and the ram were at fault.
 
How is the PCB hooked up? Edge connector if so clean it and check your voltage at the edge connector. See my video here
 
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