the control panel is completely dead, no lights, no response, but i can hear a faint hum from inside

Diagnosis

The presence of a faint hum combined with a completely dark control panel indicates that the appliance is receiving line voltage, but the logic circuit is failing to initiate the boot sequence. The hum you hear is typically the water inlet valve or the drain pump attempting to engage due to a "ghost" voltage leak or a stuck relay on the main control board. Because the Bespoke AutoRelease series uses a sophisticated capacitive touch interface, any disruption in the communication bridge between the Main PCB (Power Control Board) and the UI (User Interface) board will result in a dead panel. This state usually occurs because of a "soft lock" in the microprocessor or a physical failure in the ribbon cable connection. If the unit experienced a minor power surge, the board may have entered a protective state where it refuses to power the LEDs to prevent further damage, even while the high-voltage side of the board is still feeding power to the internal components. You can confirm this by attempting to open the door; if the AutoRelease mechanism does not trigger and the panel remains dark, the failure is localized to the control logic rather than a complete loss of house power.

How to Fix It

To resolve a frozen logic board or a loose connection on the DW80B7070AP, follow these precise steps:

1. Perform a Hard Power Reset: Locate your home's electrical breaker panel. Switch the dishwasher circuit breaker to the OFF position. Leave it off for exactly 10 full minutes. This allows the capacitors on the main PCB to fully discharge, clearing any corrupted temporary memory states.
2. Inspect the Junction Box: Remove the lower kick plate (toe kick) by unscrewing the two Phillips head screws at the bottom. Locate the electrical junction box on the right-hand side. Open the cover and inspect the wire nuts. Tug gently on the black (hot) and white (neutral) wires to ensure they haven't vibrated loose. Tighten any loose connections with a screwdriver.
3. Reseat the UI Ribbon Cable: Power down the unit again. Remove the top panel of the dishwasher by removing the screws along the back and sides. Locate the thin multi-pin ribbon cable connecting the top display to the main control board. Gently unplug the cable, inspect the gold pins for any signs of corrosion or burning, and firmly snap it back into place.
4. Restore Power: Flip the breaker back to ON and press the Power button firmly for 3 seconds to see if the LEDs initialize.

If That Didn't Work

• Replace the Main Control PCB: If the hum persists but the panel is dead, the main board has likely suffered a capacitor failure. Order the specific Samsung replacement PCB for the DW80B7070 series. Ensure you transfer any existing jumpers from the old board to the new one to maintain the correct regional settings.
• Test the UI Board: If the main board is replaced and the hum is gone but the lights are still off, the User Interface (UI) board is faulty. This board handles the touch sensitivity and LED output. Check for any moisture ingress around the top of the door seal, as steam can sometimes leak into the panel and short the UI board.
• Verify the Door Latch Switch: A faulty door switch can prevent the control panel from booting as a safety precaution. Use a multimeter to check for continuity across the door switch terminals. If the switch is open while the door is closed, the board will not send power to the display.
• Check for Interference: Ensure no high-wattage appliances (like a microwave or air fryer) are running on the same circuit. Voltage drops can cause the Bespoke's sensitive electronics to fail to boot, resulting in the "hum but no light" symptom.

Heads Up

• Avoid using "Quick Start" or "Express" cycles repeatedly if you notice the panel flickering, as this can put undue stress on the UI board's voltage regulator.
• Always use a dedicated 15-amp or 20-amp circuit for this model; sharing a circuit with other heavy kitchen appliances can lead to the logic board failures described above.
• If you find moisture inside the top panel during inspection, wipe it dry and check the gasket seal around the top of the dishwasher tub to prevent future short circuits.
• Never attempt to bypass the door switch to "force" the panel to turn on, as this can lead to accidental flooding if the pump activates without the door being securely latched.