The is a widely utilized, robust, and mature PCB found in several Dell enterprise and business-class desktop systems, most notably within the OptiPlex series . As of June 2026 , although these systems are often found in the secondary or refurbished market, the need for accurate schematics remains high among technicians, engineers, and hobbyists repairing older systems.
Always verify your board's Revision Number (e.g., Rev A00, A01) before applying voltage based on a schematic, as power rail paths can change between updates. optiplex 790 - Dell dell e93839 motherboard schematic updated
The ATX power supply feeds +5VSB . The onboard step-down linear regulators drop this to +3.3V_ALW to power the Super I/O chip (commonly an SMSC, Nuvoton, or ITE controller) and the SPI Flash ROM (BIOS). The is a widely utilized, robust, and mature
Trace the +1.5V_VCCM rail. A blown lower-side MOSFET in the memory power circuit will prevent the RAM from initializing, resulting in 2 or 4 system beeps. Continuous Reset Loop optiplex 790 - Dell The ATX power supply feeds +5VSB
If your Dell E93839 motherboard is completely non-functional, perform diagnostic tests systematically down this matrix: Phase 1: Isolation and Visual Inspection
Locate the Super I/O chip (commonly an SMSC, Nuvoton, or ITE controller).
Includes one PCIe x16 slot (blue) and one PCIe x4 slot (wire-open), essential for low-profile graphics card upgrades.
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