Provides high-speed expansion capabilities. USB 2.0: High-speed interface supporting up to 480 Mbps.
If your CM4 is showing symptoms of failure, a boardview file is your best guide. 1. The "No Power" or "No Boot" Scenario
A (typically formatted as .brd , .bdv , .cad , or .fz ) is a dynamic, interactive digital map of a printed circuit board. Unlike a flat, 2D PDF schematic that shows theoretical circuit operations, a boardview shows the exact physical location of every surface-mount device (SMD), test point, trace, and via. Clicking a pin within a boardview software immediately highlights every interconnected trace and component across all layers of the board. Why Engineers and Repair Technicians Need a Boardview
The markings on a circuit board refer to two different technical specifications. When looking for a
Without a boardview, you become the debugger. cm4+94v0+boardview
Unlike a standard Raspberry Pi, the CM4 is not meant to be used on its own. It has removed all the physical connectors (USB, HDMI, Ethernet) in favor of a pair of high-density, 100-pin connectors on its underside. This design choice gives engineers unparalleled freedom: instead of being locked into the Pi's standard rectangular shape, designers can create perfectly tailored to their product.
Several excellent, free tools are used by professional repair technicians worldwide:
The CM4 houses a Broadcom BCM54210PE Gigabit Ethernet PHY, meaning the boardview shows differential pairs moving from the SoC to the RJ45 magjack. 3. GPIO and Peripheral Mapping
Unlike a standard Raspberry Pi 4 board, which is a fully functional single-board computer ready to use, the Compute Module 4 is a compact (55mm x 40mm) core containing the heart of the system: the processor, memory, eMMC flash storage, and power regulation circuitry. Its core features include: Provides high-speed expansion capabilities
Use the "Net Highlight" feature. Click on the trace from the HDMI connector. Follow it through a series of zero-ohm resistors or filter caps until it reaches the SODIMM edge connector. You are looking for break #1 (a missing resistor) or a short to ground.
This is the most crucial term for repair. A Boardview file (typically .brd , .cad , .fz , or .pcb formats) is a visual schematic of the physical PCB. Unlike a traditional schematic (which shows logical connections), a Boardview shows you exactly where resistors, capacitors, test points, and vias are located on the actual physical board. It allows you to track a net (e.g., 3V3_AUX ) from the CM4 connector pin to a specific tiny component under the BGA.
If you’ve recently typed into your search bar, you’re likely holding a mysterious carrier board for the Raspberry Pi Compute Module 4—or trying to reverse-engineer one. You’ve probably noticed that many generic or off-brand CM4 carrier boards share a familiar code on the PCB silkscreen: 94V0 .
He zoomed in on the 94v0 layer mask near the edge connector. There, hidden under a microscopic passive component designated R45 , was a break in the trace. The boardview software, cold and precise, highlighted the disconnection. The trace was supposed to route 3.3 volts to the eMMC stub to enable write access, but the 94v0 board revision had a manufacturing defect—a hairline fracture in the copper that the schematic designers had ignored. Clicking a pin within a boardview software immediately
If you are planning to develop a CM4 carrier board, here’s how these three concepts should guide your process:
Quickly find tiny surface-mount devices (SMD) like resistors, capacitors, and diodes that lack printed labels on the actual silk-screen.
. The "94V-0" is a standard UL flammability rating typically found silkscreened on the PCB, while "Boardview" refers to the specialized software files used by engineers to trace signals and repair hardware. Raspberry Pi Core Technical Profile
Raspberry Pi Compute Module 4 (CM4) boardview, you are likely looking for the official design files CM4 IO Board , which Raspberry Pi provides in
This is the enable pin for the carrier board’s 3.3V regulator. If this net is shorted to ground, the CM4 never powers up. Use the Boardview to find every capacitor on this net.