Re: Tech: Monitor PCB problems?


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Posted by Tom61 on 13, 2000 at 9:14 PM:

In Reply to: Tech: Monitor PCB problems? posted by Tom A. on 13, 2000 at 7:02 PM:

It could be anything from an inproperly soldered component on the mon. PCB, to bad wiring, to a bad connector. Sounds like something to do with sync though. As stuff gets hot, they slowly expand, and so do the breaks... hence the problem increases as it gets hotter.

: I have a generic JAMMA cabinet that was built around 1996, maybe 1997. It is a Capcom Impress Multi Utility Cabinet that has a 29" Toshiba monitor in it. I have an owner's manual for it but it is in Japanese.

: I interface the computer to the cabinet with a typical PC2JAMMA fingerboard setup. I left the JAMMA harness intact so that I can hookup JAMMA boards if I so choose.

: When I have the PC hooked up to the JAMMA connector, the picture looks perfect for anywhere from 5 minutes to an 1 hour. At that time, the picture will jump just a little or the bottom part of the image will basically go in and out. It's hard to describe exactly but it acts like there is a loose wire. When I disconnect the PC and connect a SFII JAMMA board, the problems are the same but they don't seem quite as severe.

: After the jittering starts it will usually last for 15-30 minutes than it usually goes away. However, sometimes it does come back, I notice this more when I'm a little rough on the control panel...usally when playing with 2 players.

: Is it normal for the picture to jitter when the unit is lightly tapped? When I first turn the unit on I can tap on the control panel, side of the monitor or in the bottom compartment of the cabinet (directly below the monitor pcb) and the picture will not jump or jitter unless it is hit fairly hard. However, once the unit has warmed up for 30 minutes or so, I can lightly tap the control panel, side, or especially the bottom compartment just below the monitor PCB and the picture will jump or jitter. Sometimes after tapping it, the picture will straighten back up or sometimes it will jitter a little more. Like I said it acts like there is a loose wire.

: Now I have no experience whatsoever with electronics other than knowing how to use a soldering iron so I was hoping that this little bit of information I have provided could be used to tell me whether there is a possible component going bad on my monitor pcb or whether it is strictly a loose wire somewhere.

: I thought maybe it was the molex connector that connects the video signal wires from the JAMMA harness in the bottom of the cabinet to the monitor PCB in the monitor section of the cabinet but when I eliminated the molex connector and soldered the wires together, the problem still exists.

: Now the only video input signals that aren't soldered is the video connector to the monitor pcb. I didn't think it was a good idea to try to solder the wires directly to the monitor pcb pins.

: Maybe I should try to tighten the connector pins that connect the video signals to the monitor pcb? I'm a little leary of doing this because I'm afraid I may screw up the connectors but if it would eliminate the problem, I would be willing to give it a try.

: Any ideas or suggestions would be appreciated.

: -Tom A.




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