SamSho II crakling sound

[Apocalypse]

Hi,
I got a defective SamSho II cart (MVS) from xsq (thanks again).
The sound is crackling.
Here are some details :
- Intro sound (NEO GEO logo) plays fine
- All the music is distorted either in game or using the jukebox option in the UniBIOS
- All traces from/to the PCM chip, V1/V2/V3/V4 ROMs and the LS139 on the PROG board are fine
- Boards look really nice (no rust, no damaged areas, no scratches, etc.)

Could it be a bad ROM?

 

[Atro]

Without a video, it sounds a m1 problem maybe

 

[BIG BEAR]

make sure the pcb doesn't have a crack in it somewhere around the contacts.
BB

 

[xorthen]

Could be your board that you are playing on, could be a bad connection. Hard to say for sure. Sometimes the carts aren't always the things at fault.

 

[pulstar]

make sure the pcb doesn't have a crack in it somewhere around the contacts.
BB

This is a good place to start. Had a RBFFS that had crackling, distorted audio and it was a fine gouge/scratch right near the contacts.

 

[Xian Xi]

If there is screeching and modem sounds then it's the PCM itself. If just crackling, bad rom.

If it's the shiny toshiba chips, look at the center of the rom, if you see a square outline like an eprom window then it's most likely bad.

 

[aha2940]

http://www.neo-geo.com/forums/showt...-Masters-Bad-sound&highlight=neo+turf+masters

 

[Apocalypse]

Without a video, it sounds a m1 problem maybe

Will do a video tonight.

make sure the pcb doesn't have a crack in it somewhere around the contacts.
BB

Nope. The boards are in very good condition and I've tested all connections from the PCM chip to the contacts.

Could be your board that you are playing on, could be a bad connection. Hard to say for sure. Sometimes the carts aren't always the things at fault.

No, xsq had the issue previously and I tested it on 2 different slots.

If there is screeching and modem sounds then it's the PCM itself. If just crackling, bad rom.

Humm... Not really screeching or modem sounds.
I've noticed only low octaves have issues.

If it's the shiny toshiba chips, look at the center of the rom, if you see a square outline like an eprom window then it's most likely bad.

Yes Toshiba chips. Will have a close look.

http://www.neo-geo.com/forums/showt...-Masters-Bad-sound&highlight=neo+turf+masters

Thanks for the link. However my game doesn't sound the same.

 

[BIG BEAR]

Swap the chips to another PROGTOP or a PROGBK1. It can only be the board or a V chip.
BB

 

[Apocalypse]

Swap the chips to another PROGTOP or a PROGBK1. It can only be the board or a V chip.
BB

What about the PCM chip? Or you consider this is part of the board?

 

[BIG BEAR]

If you want to swap out the PCM that's fine but probably more easier to just swap the chips to a different PRG board just in case it's not the PCM.
BB

What about the PCM chip? Or you consider this is part of the board?

 

[Apocalypse]

[video]http://sendvid.com/6dh3j7i6[/video]

 

[Xian Xi]

[video]http://sendvid.com/6dh3j7i6[/video]

Is that after you moved the roms over or what it used to sound like? Make sure if you are planning on swapping that you verify the V roms.

 

[Apocalypse]

Is that after you moved the roms over or what it used to sound like? Make sure if you are planning on swapping that you verify the V roms.

This is the actual sound of the board, I didn't swap the ROMs yet.
If I remove them what should I choose on my programmer in order to be able to dump them?
27C160? 27C322?

 

[BIG BEAR]

v1-v3 160 v4 800
BB

This is the actual sound of the board, I didn't swap the ROMs yet.
If I remove them what should I choose on my programmer in order to be able to dump them?
27C160? 27C322?

 

[Apocalypse]

v1-v3 160 v4 800
BB

Thanks a lot.
I've downloaded the ROM of SamSho II just to compare the size of the V files and came to the same conclusion.
So V1/V2/V3 are identical to the downloaded ROM however V4 is impossible to dump (loose pin error on the programmer although I unsoldered it very cleanly).
So we may have a winner!

[EDIT] I don't have 27C800 can I burn V4 in a 27C160 and install it without modification?

 

[BIG BEAR]

Just double it (the v4) and burn to a 160
/b v4filename + v4filename (new filename v4x2)
BB

Thanks a lot.
I've downloaded the ROM of SamSho II just to compare the size of the V files and came to the same conclusion.
So V1/V2/V3 are identical to the downloaded ROM however V4 is impossible to dump (loose pin error on the programmer although I unsoldered it very cleanly).
So we may have a winner!

[EDIT] I don't have 27C800 can I burn V4 in a 27C160 and install it without modification?

 

[Apocalypse]

Just double it (the v4) and burn to a 160
BB

Sweet. Thanks again!

 

[Apocalypse]

Game saved, V4 was bad:



Thank you all!

 

[fluxcore]

Good work!