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FPJ

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Jun 3, 2019
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Here's what happens: game boots up, has no sound, pressing volume up or down just once makes the sound come back instantly. It always comes back at the volume it was at before (presumably now one click higher or lower), so it seems like it's saving the settings. So it's like it's on mute until it recognizes a volume change. This happens whether its been turned off all night or for just a few seconds.

We've tried resetting the volume by holding down the Volume Down button while booting, multiple times. We also replaced the supercap.

What else could be bad? A trace seems unlikely as the game has been sitting in a cabinet for some time and only started doing this recently.

Update: The other tech who has been working on it tells me that it isn't completely muted after booting, but is actually just super quiet. Then pressing either volume button once makes it jump back to where it should be.
 
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does it use an 8pin digital volume pot?
 
I believe it is 16-pin? On the board there is a TC9176P, which is 16-pin and the datasheet labels it as an "electronic volume IC." There is also a TC9185P which it says is the controller for the 9176.
 
That usually points to a bad supercap, but you've replaced that. Does the same issue occur over the RCA connections or just the JAMMA edge?
 
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