Puzzled on Konami Life Force PCB - sound issue

dougmanct

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Haven't seen this type of issue before, and a bit puzzled not having a schematic for this board.

Sound issue: Board boots, reports OK on everything in self test. Coin up, I get the little coin up jingle sound, AOK.

Start game - the game "music" comes on perfectly for about 2 seconds, then switches to a hum as if it's "stuck". At this point until I power cycle the board, that is all I get from audio.

Ideas on places to look? I'm ruling out the sound ROM itself as I've swapped it into a good Life Force board with no issue. (Also I would have expected that ROM not to pass boot test if there was an issue with it or its socket)

Oh, also: If I go to self test, and go to the sound test, it plays the first sound OK, but none of the sounds after the first one play.

Oh, also 2: I know whatever issue exists is on the "top" board of the stack, as swapping a known perfect bottom board does not fix the issue.
 
Repair Log:

Sound cuts out / sticks after first few seconds of gameplay. Also, only first sound effect plays in self test.


Solution:

LS244 at 10G on main board was bad. Surprise surprise, a Fujitsu. Replaced with NOS part and board runs perfectly.
 
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