DOT Lines In Discs

Todd31

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My dot plays perfect.... almost. There is a slight graphic glitch only on the discs. They have a line or two vertically through each one. What would cause a glitch only on the discs?

Thanks
 
Lines like this??? I have the same thing going on but have not taken the time to dig really deep into this.
 

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if its just the discs it maybe the bit rot in the object roms.

let me see what i have for spare eeproms and mail out to ya.
 
Vindog, my UDOT had the same symptoms as yours shortly after I got it home. After trying a few things, the only thing to make it disappear was to place some cardstock in between the edge connector/board bracket at the top. I noticed that when I moved the boards, the lines would come and go, but really only when I moved the boards and not necessarily any of the connectors. Maybe something was shorting or causing interference when the metal of the bracket and the traces on the edge connectors contacted. It's been fine for about 4 months now.
 
Mine got worse after a rom swap. I must have a bad socket or something. Here is how it looks now....

2013-03-16_13-59-32_168_zps41fe3184.jpg


Thanks for sending the roms Hamster, you are a great asset to the arcade community.

Todd
 
dot & edot glitches

Sme thing I posted on the other thread about this:

All MCR games have flaky ribbon cables that if starting to separate should be replaced. Also the 8 RAM's are two different types and from my experience they don't mix well.

Cleaning & reseating is always the right start followed by swapping new chips one at a time and looking for changes on the screen. From there it's reflowing the sockets followed by replacing the sockets - again one at a time. No need to do extra work and and no need to replace things that are good


NOTE: It's really unlikely to be the ROM's if the game is playing right with just a graphics glitch.
 
NOTE: It's really unlikely to be the ROM's if the game is playing right with just a graphics glitch.

I have a contact issue with the roms I imagine. The game works now. It worked like shit with different roms in it and now seems to work fine. Is it a bad socket? I don't know. I will resocket all the roms if I have the issues again and go from there.

I do appreciate the replies and I guess we shall see what the future brings.
 
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