Motherboard for ELEGOO Saturn 3 Ultra & Saturn 4 Ultra

The control board of a resin printer: it runs the LCD, the Z axis, the light engine and the touch panel. Owners replace it after a power surge, after resin creeps into a ribbon connector, or when the machine simply stops responding to the power button. It's an aftermarket part — ELEGOO doesn't sell Saturn mainboards at retail.

Specifications

• Two wide ribbon sockets — LCD panel and control panel
• USB-A port for a flash drive and a switched power inlet
• Five service connectors: Z axis, endstop, fan, light engine
• Heatsinked SoC with a separate memory chip

Compatibility: ELEGOO Saturn 3 Ultra and Saturn 4 Ultra. One listing covers several machines — the seller's title also name-drops the Mars 5 and a 16K revision, so pick the variant for your printer explicitly. Compare the ribbon width and the number of service connectors against the photo first: the 12K and 16K versions aren't wired the same.