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Home▸ Forums▸ SE/30 sound issues: Installed 3rd party ROM in SE/30; sound gone, only static — #18▸ SE/30 sound issues: Installed 3rd party ROM in SE/30; sound gone, only static —
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if the headphone jack works fine, then you need to check the op-amp and transistor pair next to the sony chips. That drives the speaker. 

Also keep in mind the speaker amplifier gets its signal from a reed finger in the headphone jack, so if the jack is corroded slightly, the speaker may or may not work or intermittently.