Big Fight - Big trouble in the Atlantic ocean little help.

[misiequ]

Hello.
I have a small problem with my game Big Figth - Big trouble in the atlantic ocean and I am looking for a manual for it.
Or information about the optimal voltage for this arcade PCB. Yes, I know you will write me 5V but sometimes some games like a little more and others a little less and I want precise information.
I have noticed in two places that glitches appear and I would like to diagnose their source.
Best regards Mike

 

[misiequ]

photos of both PCBs at @promking request

 

[Monstermug]

U shouldnt really adjust voltages for each pcb. Its a recipe for disaster. If pcbs is drawing down the current then that shohld be addressed on the pcb

 

[misiequ]

U shouldnt really adjust voltages for each pcb. Its a recipe for disaster. If pcbs is drawing down the current then that shohld be addressed on the pcb

I agree with you, but in this particular case - I don't know if it has anything to do with the "size" of the PCB itself, but the game starts without any problems when I raise the voltage above 5V.

 

[Monstermug]

Yes its because there is a problem on the pcb may it be bad contact, partially or completly failed devices or components. If u measure voltages at the actual chips u might find they are less than where u are reading them now. In all cases voltages shouldnt need to be adjusted. A perfectly working pcb will happily run well below 5v. Hirose jamma edge connector should be made mandatory.

Thought experiment. A Loose/dirty edge connectors not making good contsct with the pcb. Pcb only receive 4.2v not enough for logic level. So on your led you increase drom 5v to 5.8v. Pcb works! Because its now getting 5v.

What happens if the pcb moves or vibrates and then makes proper contact with all 5.8v?

My big fight trouble in atlantic happily runs at 4.79v at jamma edge or 5.05 at the psu. If i use my fluke its 4.88v at jamma edge.

 

[Monstermug]

Check for hot chips too. Or use a thermal imagining camera or maybe a current tracer like hp brand might help u locate the bad device. Its most likely a ram as they dont like to go gracefully..

 

[misiequ]

Check for hot chips too. Or use a thermal imagining camera or maybe a current tracer like hp brand might help u locate the bad device. Its most likely a ram as they dont like to go gracefully..

ok, following your advice I will check the voltages and heating chips