One minute good frequency, next minute bad

whoamonga

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I've got a Time Killers board in a gray Data East cab that was working a few days ago. I took the board out and cleaned out the cab, inside and out. Just vacuuming and general cleaning.

Anyway, thought I'd test out a Captain America board I haven't been able to test before, and it worked just fine. But when I put the Time Killers board back in, it plays as if the monitor frequency is all out of sync...

Two reasons this shouldn't be: 1. it worked earlier. and 2. Cap'n America, and Snow Bros. both worked just fine.

Anybody have any experience with a board working one day, then not working the next?

I was thinking about tweaking the h-freq on the monitor to see what happens. How would I go about doing this on a WG4900?
 
what about when you swap board A with board B, don't adjust, and put board A back in? Thing is, it had the same sync issue with a Victory Road PCB as well...
 
poor connection on the edge connector? Sync wire not making good contact? Wiggle the edge connect to see if it has any effect.

if its loose, you can replace pins, tin your edge connector(build up the pads, generally a bad idea), or see if you can shove flat toothpicks behind the pins. (raises the pins and a non destructive quick fix) I usually do 1 side. if its still loose I hit the other.
 
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had something similar with the cab for my MKs. the JAMMA harness was pretty cannibalized. I had to replace the sync pin entirely, and then the other video signal cables went out of whack. inevitably I got lucky and had all the stars in alignment and just hit the JAMMA harness with hot glue.

no longer do I have sync problems when switching boards. except tonight, when I pulled Tekken 3 out and put UMK3 back in -- had to adjust the vertical sync.

I know exactly what you speak of. it's normal. just has to do with all PCBs (even if they're the same game) not being the same. that's why the vertical hold pot was invented, I suppose. (or at least one reason :))
 
I see what you're saying, I just thought it was funny that it's consistently out of sync with the right games. For instance, EVERY time I put in game a, it works, and every time game b, it doesn't... but USED to.

I'll delve further into this though, probably bypass the sync wire in the harness altogether to see if it makes a difference.

Thanks for all the help!

by the by, LOVE your collection Mecha.
 
by the by, LOVE your collection Mecha.

:D

all the stuff my grandparents had in their arcade in the 90s. well, minus the KI stuff.

now I've stocked them up with fighting games to appeal to quarter-life crisis folks like myself. LOL

had Time Killers back in the day, but after buying gatordad's KI2 I told my fiance that I was "done". other stuff I can just use MAME for I guess... have been the last 9 years anyway.

just out of curiosity what kind of monitor are you running? am I crazy, or would one of those multi-sync monitors actually eliminate this problem?
 
It's a k4900 i do believe. But i can't afford another monitor... I've got a crapton of malfunctioning 4600's as it is.
 
It's gotta be that board... Some other boards are working first try, and no adjustment of the vertical hold is making it any better. The screen changes color and fades to different screens in attract mode, but it's all outta sync.

Gonna try and re-seat the connections. The green LED on the back of it is flashing green, maybe that means something?
 
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