The Blackmagic Design Spares - ATEM 1 M/E Panel - PCB Main Internal Power Supply is the critical voltage regulation board found inside the legacy ATEM 1 M/E Broadcast Panel.
In these professional control surfaces, power is managed in a two-stage process. There is an internal AC-to-DC switching module (the "brick") that converts wall power to a bulk DC voltage, and then this Main Internal P/S PCB takes that power and breaks it down into the precise $3.3\text{V}$, $5\text{V}$, and $12\text{V}$ rails required to run the thousands of button LEDs, the LCD menu screen, and the main logic processor.
Core Responsibilities
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Voltage Distribution: Acts as the "clearinghouse" for power, sending the correct wattage to the button banks and the system control section.
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LED Current Regulation: Ensures that all 20+ buttons have consistent brightness and color without flickering.
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Noise Filtering: Cleans the electrical signal to prevent "interference" in the digital communication between the panel and the ATEM switcher.
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Thermal Protection: Includes heat sinks and capacitors designed to handle the 24/7 power draw of a live broadcast environment.
When to Replace the Internal P/S PCB
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Partial "Blackout": The panel powers on, but only certain sections light up (e.g., the fader works, but the button rows are dead). This usually indicates a failure of one specific voltage rail on the PCB.
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Random Reboots: The panel "glitches" or restarts during a show, particularly when button brightness is set to high or when many buttons are being pressed simultaneously.
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"Coil Whine" or Buzzing: High-pitched electrical noise coming from the panel is a sign of failing capacitors on this board.
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Unresponsive Network: If the power rail for the Ethernet controller is "sagging," the panel might light up but will fail to connect to the switcher.
Technical Installation Note
Repair Level: 3 (Moderate).
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Capacitor Discharge: Crucial Safety Step. Unplug the panel and let it sit for at least 15 minutes before opening. The large capacitors on the power boards can hold enough charge to give you a significant shock.
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Wiring Harness Orientation: This board is connected via several multi-colored wiring looms. Take a photo before disconnecting. While the connectors are usually keyed, it is easy to snag a wire or pinch a harness during reassembly.
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Grounding Standoffs: Ensure every screw is replaced and tightened. These screws often provide the "common ground" for the entire panel; if one is missing, you may experience static or touch-sensitivity issues on the buttons.
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Airflow: Check the internal fans while you have the unit open. If the fans are caked in dust, the internal P/S board will overheat, leading to a repeat failure of the new part.
Diagnostic: Internal P/S vs. AC Module
If your panel is completely dead (no lights, no fans):
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Test the AC Module: Use a multimeter to check the output of the internal "brick." If it is outputting 0V, replace the AC Module.
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Test the P/S PCB: If the brick is outputting steady voltage (usually $12\text{V}$ or $15\text{V}$) but the panel won't boot, the Main Internal P/S PCB is failing to convert that power for the internal components.
Expert Advice: If you are in a region with inconsistent power (spikes/brownouts), this is the part most likely to fail. Always run your ATEM panels through a high-quality Online Double-Conversion UPS to protect these internal regulation boards from "dirty" power.
Has the panel stopped powering on entirely, or is it just acting erratically during high-intensity use?
