Ms pacman screen, too much red???

br549autosales

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I have a ms pac that was showing up really red on the screen, I installed good monitor with a clear screen and have the same results. If it matters, this machine has the filter board in top if the CPU, can that be removed and the connector just plugged in directly to the CPU? Also when you start a game, the game credits up continuously until it gets to 99 credits, any ideas on that as well?

Thanks,

David
 
Yes, it is recommended you remove the filter board and plug the harness directly on the pcb.
Check resistors next to 7F for shorts or damage.
The coin up problem could be shorted wiring, stuck coin switch, shorted trace, bad buffer ic, shorted .1 uf cap.
 
when I remove the filter board and plug it in directly to the PCB the game will not come on. I do not have a degaussing coil, I have heard that sometimes if they just sit in the same location for awhile, the magnetic field will change naturally, is this true?
 
when I remove the filter board and plug it in directly to the PCB the game will not come on. I do not have a degaussing coil, I have heard that sometimes if they just sit in the same location for awhile, the magnetic field will change naturally, is this true?

Can actually make the problem worse, especially if there is a magnet or speaker sitting near the pic. tube.
 
There is no magnet near the picture tube, I'm guessing that it has to have some thing to do with the PCB board instead as Riptor suggested.
 
If it were a pcb problem it shouldnt just appear on part of the screen. That makes me think its a degaussing issue. Have a solder gun? You can use that to degausse. It needs to be a solder gun, not iron.
If this is an original cab you should be able to remove the filter board and plug directly into the pcb.
 
If the game turns on with the filterboard, then there's absolutely no reason why it wouldn't come on without it. Unless your harness connector is shot, which is very likely the problem.

Try hooking the harness up directly to your PCB, and wiggle the harness connector while the game is powered on. See if you can get it to come on then. If you get intermittent powering on while wiggling the connector, it's time to replace the edge connector.
 
Looks like this:

VRA-284-O.jpg
 
Yes, it is recommended you remove the filter board and plug the harness directly on the pcb.
Check resistors next to 7F for shorts or damage.
The coin up problem could be shorted wiring, stuck coin switch, shorted trace, bad buffer ic, shorted .1 uf cap.

Where is the buffer ic and the .1 uf cap? located?
 
It depends which coin input is stuck. 8H and 8F, capacitors C25 & C26. Its kinda strange if it only does it after starting a game.
 
well it does it after turning the game on and immediately goes into start game then continues to credit up until it reaches 99 credits
 
Yes, it is recommended you remove the filter board and plug the harness directly on the pcb.
Check resistors next to 7F for shorts or damage.
The coin up problem could be shorted wiring, stuck coin switch, shorted trace, bad buffer ic, shorted .1 uf cap.


The resistors next to 7F, is that the problem with the poor color quality/too red?
 
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