the Blackmagic Design Video Assist 12G 5 - Main PCB is the primary internal logic board for the 5-inch 12G HDR model of the Video Assist. As the central processing hub, this board manages the complex task of handling high-bandwidth 12G-SDI and HDMI 2.0 signals in a compact, handheld form factor. It is the essential replacement part for units experiencing processor failure, port damage, or issues with 4K recording stability.
High-Performance 4K and BRAW Processing
This Main PCB is designed to facilitate professional-grade monitoring and recording at resolutions up to 2160p60. Despite the small size of the 5-inch unit, the board contains the advanced silicon required for:
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Blackmagic RAW Recording: It enables the Video Assist to act as a BRAW recorder for a wide range of supported mirrorless and cinema cameras.
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HDR Metadata Handling: The board processes HDR10 and HLG metadata, ensuring the connected display accurately represents high-dynamic-range footage.
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USB-C Recording Logic: It manages the high-speed interface that allows for direct recording to external SSDs and flash disks.
Professional Integrated I/O
To maintain the rugged, portable nature of the 5-inch 12G model, all critical ports are integrated directly onto the Main PCB. Replacing this board effectively restores the physical connectivity of the device, providing:
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12G-SDI Micro BNC (HD-BNC) In/Out: Supporting the full range of SD, HD, and Ultra HD signals up to 12G.
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Full-Size HDMI 2.0 In/Out: Ensuring high-bandwidth 4K video throughput.
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Dual UHS-II SD Card Slots: Managing the high-speed write speeds necessary for high-bitrate ProRes and DNx recording.
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3.5mm Audio and Power: Controlling the headphone monitoring output and the 12V DC locking power input.
Advanced Power and Thermal Management
The 12G 5-inch model packs significant processing power into a small space, creating unique thermal demands. This PCB is designed with efficient power distribution for the dual Sony L-Series battery system and features specialized circuitry to manage the high-draw requirements of the 2500-nit HDR backlight. It is engineered to dissipate heat through the camera's magnesium alloy chassis to prevent overheating during long 4K recording sessions.
Key Features
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Genuine Blackmagic Spare: Specifically engineered for the 5-inch Video Assist 12G HDR.
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4K DCI Ready: Supports high-frame-rate Ultra HD and 4K monitoring and recording.
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Blackmagic OS Architecture: Fully compatible with professional tools like 3D LUTs, focus peaking, and digital slates.
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Factory Standard Reliability: Built to the same rigorous specifications as the original internal hardware.
Technical Installation Note
The internal tolerances of the 5-inch 12G model are extremely tight, making this a complex repair.
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Precision Handling: Requires the careful removal of several small ribbon cables and ZIF connectors.
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Heat Sink Alignment: It is critical to ensure the main processor is correctly aligned with internal thermal pads to maintain the device's cooling efficiency.
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ESD Safety: An anti-static workspace is mandatory to prevent damage to the high-speed 12G processing components during the swap.
