Snow Bros Repair Log

[dave11674]

Hi guys

so ive had this snow bros in my possession a while now.



the game wasnt running at all.

Fist things first, replace the custom audio chip that was hanging off...



So probing about a bit and reaading other repair logs i decided to change the 4 x oki @ A3 and A5 & B3 & B5. also the nec @ F4.




no avail, still dead.

so only been a small PCB i decided to SLICE the TTL logic.

Nothing, all passed ok, what a cracking tool the SLICE is too, thanks to GadgetFreak.



So moving onto the colour ram i decided to piggyback with good working new stock.





Hmmmm i have some life at last

So decided to remove and socket these 2 rams and placed the new rams in their place.

To my surprise i was greeted with these 2 screens




Up and running but the sound was very scratchy.

so i opted to socket the YM3812

As in the test menu lots of sounds were spot on crystal clear, but others were scratchy, so thinking some of the channels were a bit fluffed.

socketed again and put a YM3812 from another pcb in its place, and hey presto all sounds were crystal once more.

parts used....

4 x oki M41464-10

1 x nec D41101C-1

2 x Hitachi HM6116P-2

1 x custom sound ic

1 x yamaha YM3812

rough time to fix...circa 6 motnths lol

Would like to thank GadgetFreak & CMONKEY for their help in this repair.

thank you guys, your help and wisdom was greatly appreciated.

dave11674

dave116742019-12-03 18:32:22

 

[SUPERSPRINT]

Thanks for sharing, great fix.

 

[cmonkey]

Well done Dave. Nice to have another board up and running. Snow Bros is a fun game and a powerful board to write homebrew code for. With support for 512 sprites and no tile layers it makes you approach game/demo design from new angles. And thanks to Macro and Haze for writing the MAME driver for this game.