I'm working on a LC575 board-- recapped it and reworked an overclock section. It had been running at 43Mhz for about ten years.
It's running at 33Mhz right now and there's still no sound after the recap. I found a bad trace from C4 to U1 was well. Had to re-flow a leg on U1.
If I plug in a set of ear buds, I can occasionally and barely hear some Alert sounds when I play them in sound control panel. But mostly I hear noise from the disk and mouse when I move it around.
Does anyone have schematic or drawing of the sound circuit? I'm wondering if the old caps took out the sound chip.
It's running at 33Mhz right now and there's still no sound after the recap. I found a bad trace from C4 to U1 was well. Had to re-flow a leg on U1.
If I plug in a set of ear buds, I can occasionally and barely hear some Alert sounds when I play them in sound control panel. But mostly I hear noise from the disk and mouse when I move it around.
Does anyone have schematic or drawing of the sound circuit? I'm wondering if the old caps took out the sound chip.