Lac781p Schematic Top |best| Jun 2026

The "LAC781P" is almost certainly a variant of the or specifically a 78xx-type regulator with a unique prefix. The "LAC" prefix suggests a specific manufacturer’s coding (possibly a Chinese or Asian semiconductor brand, or an older OEM code). The "P" typically denotes plastic package (TO-220) as opposed to "M" for metal can or "D" for surface mount.

Pressing the button should cause a voltage drop (typically 3.3V to 0V ) on the specific trigger pin, signaling the Super IO to initiate the full power-up sequence. Troubleshooting "No Power" Symptoms lac781p schematic top

Because LAC781P is less common than standard 7812, official datasheets may be hard to find. Here are reliable methods: The "LAC781P" is almost certainly a variant of