centipede sound issue

mudhens1

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i bought a working board from someone on here and a jamma adapter from y-plus tech out of canada...video is great, but the sound is staticy, has a loud hum and you can barely hear the game sounds...an odd thing is when i use a small screwdriver to adjust the volume pot on the jamma adapter, i can hear our local AM radio station thru the speaker...any ideas?
 
Could be the LM324 on the game board. They often seen to die on Centipede boards.
Go over the legs of the LM with your fingers when the game is running to see if you hear any changes.
 
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Do you have a way to test the board without the adapter? I (personally) think a lot of Yanton's stuff sucks.

Edward
 
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