BLITZ/SHOWTIME 2000 GOLD - No Sound

[savj14]

I'm looking to buy this arcade but the guy says everything works great except there's no sound. How easy of a job would it be to get the sound working? I'm considering converting it to a MAME cabinet but would love to get some use out of it first.

[savj14]

So I bought this arcade and the speakers work but when booting it up it shows DRAM Failed.Any way to fix this? Or do I need to buy a new PCB?

Also there is some screen tearing at the top of the monitor. How do I fix that?

[lilshawn]

well, i'd hate to state the obvious, but if the DRAM test failed, i'll bet you will have to replace the DRAM chip.

it would be a matter of finding a replacement and removing/unsoldering the old one and putting in the new one.

the DRAM is used as a staging area for info stored in the ROM chips. see, ROM is slow to access... and in order for the sound to sync up to the video properly, we need to load it into something faster...DRAM.

[MonMotha]

The sound hardware on the Durango/Vegas boards is essentially the same as the old stuff developed back in the MK2 days.  The difference is that, instead of storing the sound effects in ROM chips, they're stored on the main program hard drive and loaded into a DRAM by the game at runtime.  This means that, if that DRAM is bad, the sound system is effectively unusable.

The startup process should visually identify the location of the bad chip.  If it doesn't, take a picture of your boardset, and I'll point it out for you.  It's on the IO PCB (the one with the JAMMA connector).

Check for cracked solder joints on the bad chip.  Otherwise, just replace it.  You may be able to get a suitable chip from an old PC SIMM (I think it's an EDO or FP type).  Failing that, you'll probably need a donor dead Durango/Vegas or maybe Seattle board to steal one from.

(Durango and Vegas are very similar - I don't remember which one Blitz/Showtime uses)