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Pc engine GT / turbo express sound issue


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Hi guys 

I have an sound issue on my pc engine GT. The sound is really low on the speaker 
I already replaced all capacitors: but nothing better.
I double check capacitors connections but all is ok.
I change the sound amplifier by another one of a dead motherboard: but same issue.
I also tried the control board (with speacker) on another console and sound is great ,loud... So the issue come from the mother board.
Anyone has an idea of which component I can check or look at?
Thanks in advance for your idea:)
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