Cm4 94v0 Boardview New [2026]

Understanding the CM4 94V-0 board layout and having access to its boardview files is essential for anyone designing custom carrier boards or performing hardware repairs on the Raspberry Pi Compute Module 4 (CM4). The CM4 represents a significant departure from previous SODIMM-style modules, utilizing two high-density 100-pin connectors for its electrical interface. Understanding the CM4 94V-0 Specification The "94V-0" label on your board refers to the UL 94V-0 flammability standard , indicating that the PCB material is self-extinguishing and meets specific safety requirements for electronics. Form Factor: The CM4 measures Core Components: It features the Broadcom BCM2711 quad-core Cortex-A72 processor, options for 1GB to 8GB of LPDDR4 RAM, and optional 8GB to 32GB of eMMC flash. Key Interfaces: The module breaks out Gigabit Ethernet, PCIe Gen 2 x1, dual HDMI 2.0, and 28 GPIO pins. Why You Need a Boardview File While a schematic tells you how components are connected, a boardview shows you where they are physically located. This is critical for: Raspberry Pi Compute Module 4

This report covers the Raspberry Pi Compute Module 4 (CM4) board layout, design files, and common technical issues. Note that "94V-0" is not a model number but a UL flammability standard indicating the PCB material's heat resistance. Core Documentation & Design Files While Raspberry Pi has not released official schematics for the CM4 module itself, they provide comprehensive design files for the CM4 IO Board , which serves as the primary reference for boardview and layout. Official Design Files: You can download open-source KiCad files, including schematics and PCB layouts, from the Raspberry Pi Design Files repository . Carrier Board Templates: These files allow you to see exact trace routing and component placement for high-speed interfaces like PCIe, USB 2.0, and dual HDMI. KiCad Compatibility: Most official projects and custom carrier board designs require KiCad version 6.0 or later for full compatibility. Critical Technical Specifications For boardview analysis and troubleshooting, pay close attention to these power and signal requirements: Boot Requirement (GPIO_VREF): The CM4 will not boot unless GPIO_VREF (Pin 78) is powered. It must be tied to either +1.8V or +3.3V , depending on your desired GPIO signaling voltage. Power Rails: The module requires a stable +5V input. It internally generates 3.3V and 1.8V, but these rails may not activate if Global_EN is not pulled high or if GPIO_VREF is unpowered. High-Speed Routing: USB 2.0 differential pairs should be routed with a 90Ω differential impedance and length-matched to within 0.15mm to ensure signal integrity. Common Troubleshooting & Repair When using a boardview for repair or custom PCB design, users frequently encounter these issues: CM4 schematic - Raspberry Pi Forums

Guide: Using CM4 94V-0 BoardView Files 1. What You Are Looking At

CM4 : Raspberry Pi Compute Module 4 – a DDR2-SODIMM form factor carrier board. 94V-0 : UL flammability rating (PCB material). Not a design revision – it just means the bare PCB resists fire. Ignore this for schematics; focus on the version number (e.g., CM4 Rev 1.0, 1.1, 2.0). BoardView File ( .brd , .cad , .fz , .pcb , .csv ): A visual representation of components, test points, vias, and net names on the PCB. Does not contain schematics (component values, IC internals). cm4 94v0 boardview new

⚠️ No official CM4 boardview files are released by Raspberry Pi. You will find community-generated or third-party files. Verify accuracy against physical board.

2. Software to Open BoardView Files | Software | File Support | Platform | Best For | |----------|--------------|----------|----------| | OpenBoardView | .brd , .fz , .csv | Win/Linux/Mac | Free, fast, netlist highlighting | | PCBRepairTool | .brd , .cad | Windows | Repair shops, component search | | Logic (Saleae) | custom exports | Win/Linux/Mac | Debugging with logic analyzer | | KiCad | .kicad_pcb | All | If you import/convert to native format | Recommended: OpenBoardView – lightweight and handles most community CM4 boardviews.

3. Understanding the CM4 BoardView Structure A typical CM4 boardview will show: | Layer | What It Shows | |-------|----------------| | Top (Red) | Components (U1, U2...), test points (TP1), edge connector pads | | Inner 1 | DDR4 address/command lines | | Inner 2 | Power planes (3.3V, 1.8V, 0.9V VDD_CORE) | | Bottom (Green) | Mostly decoupling caps, pull-ups, secondary connectors | Key Components to Locate in BoardView | Ref Des | Function | Common Net Names | |----------|----------|------------------| | U1 | BCM2711 SoC | ETH_TXP , HDMI0_SCL , GPIOx | | U2/U3 | DDR4 RAM (2 or 4 chips) | DDR0_DQ0 , DDR0_CK_T | | U4 | PMIC (DA9090) | VDD_CORE , VDD_IO , 3V3 | | J1 | DDR2-SODIMM edge connector | PCIe_CLK_N , USB_D_P , HDMI_CEC | | X1 | 27MHz crystal | XIN , XOUT | | U6 | eMMC (if populated) | EMMC_D0 ... D7 , EMMC_CMD | Understanding the CM4 94V-0 board layout and having

4. How to Use BoardView for Diagnosis Scenario A – No Power / Short Circuit

Open boardview and search for VIN (5V input from SODIMM). Trace to U4 (PMIC) pins: VIN1 , VIN2 , VIN3 . Check 3V3 and 1V8 nets – all decoupling caps are listed. Use boardview to probe physically: click a cap (e.g., C234 ), find its coordinates, probe with multimeter.

Scenario B – Broken GPIO / No USB

Search for net USB_D_P or USB_D_N . Boardview shows which via or test point connects to BCM2711 pin GPIO42 / GPIO43 . Follow from J1 pin 28/30 through series resistors (e.g., R15 , R16 ) to SoC.

Scenario C – HDMI not working