Blackmagic Design Spares - Video Assist 12G 5 - Main PCB

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:

• Blackmagic RAW Recording: It enables the Video Assist to act as a BRAW recorder for a wide range of supported mirrorless and cinema cameras.

• HDR Metadata Handling: The board processes HDR10 and HLG metadata, ensuring the connected display accurately represents high-dynamic-range footage.

• 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:

• 12G-SDI Micro BNC (HD-BNC) In/Out: Supporting the full range of SD, HD, and Ultra HD signals up to 12G.

• Full-Size HDMI 2.0 In/Out: Ensuring high-bandwidth 4K video throughput.

• Dual UHS-II SD Card Slots: Managing the high-speed write speeds necessary for high-bitrate ProRes and DNx recording.

• 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

• Genuine Blackmagic Spare: Specifically engineered for the 5-inch Video Assist 12G HDR.

• 4K DCI Ready: Supports high-frame-rate Ultra HD and 4K monitoring and recording.

• Blackmagic OS Architecture: Fully compatible with professional tools like 3D LUTs, focus peaking, and digital slates.

• 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.

• Precision Handling: Requires the careful removal of several small ribbon cables and ZIF connectors.

• 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.

• ESD Safety: An anti-static workspace is mandatory to prevent damage to the high-speed 12G processing components during the swap.