Legacy industrial machines don't always retire cleanly. When a controller board or a video/display interface fails inside a CNC unit, automation line, or older edge-control cabinet, you face a practical repair decision: replace the entire system or find a used board that matches the original architecture. These two boards take very different approaches. The ST4504-2 is a general industrial control board. The Egan 470590 is a graphic/video controller board used in CNC and industrial display applications. Your choice comes down to what failed and which interface your machine expects.
Quick Verdict
If your machine needs a general-purpose control board, start with the ST4504-2 at $99.99. If the failed part is a graphic/video controller for a CNC or industrial display, evaluate the Egan 470590 at $254.15. The Egan is $154.16 more, but it is the specialized video board; the ST4504-2 is the lower-cost control option.
Comparison
| Board | Listed Price | Condition | Interface Focus | Best Fit |
|---|---|---|---|---|
| ST4504-2 Industrial Control Board - CE Marked - Gold Edge Connector | USD 99.99 | Used | Gold edge connector | General control / legacy automation |
| Egan 470590 Graphic Controller Board ISA Video Card Industrial CNC PCB - Tested | USD 254.15 | Used | Graphic/video output | CNC display / machine interface |
Where Each Wins
Where ST4504-2 wins: If you need a general-purpose control board at a lower cost, the ST4504-2 is the more practical candidate. It is identified by model WPC-179 and intended for OEM control systems, automation equipment, or legacy machine controllers. For a repair that only needs a control board, this is the right category.
Where Egan 470590 wins: If the failed component is the video/display controller, the Egan is the board that matches that role. It has video/output connectors, an onboard processor, and multiple IC banks, and it is identified by model 470590. This is the board to pick when graphic output is the problem.
Product Notes
ST4504-2 Industrial Control Board - CE Marked - Gold Edge Connector
This used board carries the model identifier WPC-179 and a gold-finger edge connector. Multiple integrated circuits sit on the board, and the green jumper wires point to prior modification or repair, so treat it as a used service part with visible history. In an OEM industrial control system, automation equipment, or legacy machine controller, it fits the general control-board role. The board is fully intact and shows normal wear from service. It is not a graphic/video controller, so if your failure is on the display side, this is the wrong slot to fill.
Egan 470590 Graphic Controller Board ISA Video Card Industrial CNC PCB - Tested
This used board is identified by model 470590 and the Egan name. It has multiple IC banks, an onboard processor, and video/output connectors, matching the role of a graphic controller in a CNC or industrial machine interface. The board is described as clean with no visible physical damage and is listed as tested. If your system needs a replacement for this kind of video controller, the Egan is the board to evaluate. Its limitation is the opposite of the ST4504-2: it is specialized for graphic/video control, not for general logic control, and it belongs to a proprietary industrial video system. For a straight control-board replacement, the Egan is not the right fit, but it is the targeted choice for display-side repair.
Final Choice by Use Case
If your goal is a cost-conscious replacement for a standard industrial control board, the ST4504-2 is the board to start with. If your goal is restoring graphic/video output on a CNC or industrial system, the Egan 470590 is the more targeted choice. Match the board's function to the failed component before you match the price.
