Sound problem with Neo Geo Cart

[Moonwalker]

Hi,

I have a problem with my Thrash Rally homecart.

One of the sound channels doesnt work, there is only a distorted noise instead.

I cleaned it a lot and opened the cart, but no success. The neo geo logo jingle plays fine but the engine sound is totally broken.

I checked the boards but could not see anything unusual, so my suggestion is that the sound chip is broken.

Has anybody an idea on how to fix the problem? Or is there a possibility to change the sound chip?

Thank you in advance.

[trap15]

Do other carts work? If so, your cart is probably a shitty bootleg.

[Moonwalker]

Other carts work and no its no bootleg.

[shadowkn55]

Check for cold solder joints on the V roms. If you suspect that the sound chip (PCM) is bad, try reflowing the pins if you can first. If it's still bad, you can find donor pcm chips basically on any other neo geo cart (aes or mvs). Puzzle bobble mvs boots are a good source.

[Moonwalker]

Thanks, I will try.