4 slot problem

I have a 4 slot with a video problem in slot 4 only. It doesn't matter what game I put in the slot it displays the same problem being missing vertical lines. These lines are in the neo geo bootup and in the main game characters (players), all other graphics in the games are fine and games play fine. The other 3 slots have no problems at all and work great.

I have cleaned and re cleaned everything, so this can be disregarded. I can not find any broken traces. There is 5 volts at the connection. I have tried with 4 games in and with 1 game only in, I am using known good games.

try 5.15 to 5.25 volts. my 4-slot will not work at all with less than 5.15 volts and will not work with 4 games at less than 5.23 volts, measured at the end of your jamma connector.

-DT

Thanks for the reply I'll up the power.

In addition to what is allready posted, some of the female socket pins in slot #4 may be bent and not making proper contact. You can visually inspect them to see that they're all bent uniformily. I'm sure you've allready done this while cleaning, but I've had similar problems with multi slot mvs boards.

Sorry for the bump here, but semi-related... I recently tested my power supply while testing some pins on a pcb with a multimeter and found that the voltages on both +5 and +12 are lower when there is a load on the PSU. This could be why I need higher voltages (I was measuring PSU w/o a load before). Is this a sign of imminent PSU failure or normal due to amps drawn by various pcbs?

(It's a swiching type peter chou if anyone is wondering)

cheers,
-DT

dogtoy said:

Sorry for the bump here, but semi-related... I recently tested my power supply while testing some pins on a pcb with a multimeter and found that the voltages on both +5 and +12 are lower when there is a load on the PSU. This could be why I need higher voltages (I was measuring PSU w/o a load before). Is this a sign of imminent PSU failure or normal due to amps drawn by various pcbs?

(It's a swiching type peter chou if anyone is wondering)

cheers,
-DT

Click to expand...

From what I've heard... it's normal for there to be more current while no load is present.