spy hunter buzz

paul400

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have a spy hunter sitdown, when i coin it up i get a buzzing nosie in the back speakers. all the sounds are fine. when the game is over the buzz stops,if you get the top ten score it will turn on again then stop after you entered your initals. any thoughts? i think its coming from the ssio board.
 
Do you have a switching power supply in the game? Or the original linear power board?
 
unplug the lamp driver pcb and see if the buzzing stops.
 
i tryed a switcher but it was buzzy all the time so i went back to the linear ps.i will try unplugging the lamp driver and see what happens.
 
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