kazuyajin1080
Student
I will definitely take a look. Thank you so much again. It was just this one in particular causing me issue since the taito f3 one I bought from you is working its charm and hearing those elevator action return tunes in glorious stereo~Confirm the wire harness has continuity and is straight-wired as pictured below:
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I've seen this happen with a failed DAC chip (TDA1386T) and fixed by replacing the chip. Since you're getting the left channel, the digital input on this chip is probably ok and the issue is on or after the DAC output. You can get this chip from a dead Sega Saturn or eBay.
Logic probe TDA1386T (datasheet available here) on the following pins:
18 - left channel output
21 - right channel output
You should be able to hear noise in additional to a hi tone on working outputs (make sure game is outputting sound when probing). If you get a simple hi tone then it could be bad.
Let me know what you find!