Siemens SINUMERIK 840C CRT to LCD Replacement
Factory Direct Upgrade Module β No Middleman, 2-Year Warranty, Ships Within 24 Hours
About the SINUMERIK 840C
The Siemens SINUMERIK 840C was a high-end CNC control introduced in the early 1990s, used primarily on large milling machines, lathes, and transfer lines. It features a modular architecture with separate NCU, PLC, and display components. The 840C's CRT display is a 14-inch or 9-inch monochrome/color unit depending on configuration.
After 25-35 years of operation, these CRTs are failing at an accelerating rate. Siemens has discontinued most 840C display models. Third-party LCD replacement is the practical solution.
Display Models Used on SINUMERIK 840C
| CRT Model | Type | Size | Status | Our Solution |
|---|---|---|---|---|
| 6FC3988-7FA20 | Monochrome LCD/CRT | 9" | Discontinued | KTV148 β |
| 6FC3998-7FA20 | Monochrome CRT | 9" | Discontinued | KTV148 β |
| SM0901 / 579417 TA | Monochrome display | 9" | Discontinued | KTV148 β |
| SM1200 | Color TFT | 12.1" | Discontinued | KTV121 β |
| 6FC5103-0AB01 | CRT (DB-25) | 9" | Discontinued | KTV series β |
Why Factory Direct Matters for 840C Owners
- Price: Monitech charges $500-900 for equivalent units. Our factory direct pricing: $199-450.
- Stock: We keep 200+ units in stock. No backorders, no lead time.
- Warranty: 2-year warranty vs typical 1-year from resellers.
- Customization: Need a specific bracket or cable length? We'll make it. We're the factory.
How to Order
Send us a photo of your current 840C display (front and back showing the connector). We'll confirm compatibility and send a firm quote within 4 hours on business days.
- Email: [email protected]
- WhatsApp: +86-13686889647
- Online Quote Form
SINUMERIK 840C Quick Facts
| Introduced | 1991 |
| Display interface | Proprietary Siemens 20-pin (same as 810/820/880) |
| Common CRT size | 9" mono / 14" color |
| Common failure age | 25-35 years |
| Upgrade difficulty | Easy β 20-30 min, plug-and-play |