Siemens CRT to LCD Upgrade Guide
Kongto Technology Engineering Team | Updated July 2026 | 7 min read
Siemens Sinumerik controls power many of the world's machine tools. Their CRT displays, including models from the 810T, 820T, 840C, and 840D series, are now reaching end-of-life. This guide covers LCD replacement for common Siemens Sinumerik CRT displays.
Compatible Siemens CRT Models
| CRT Model | CRT Size & Type | Sinumerik Control | LCD Replacement |
|---|---|---|---|
| 6FC3988-7FA20 | 9-inch Monochrome CRT | 810T/820T/840C | 8-inch TFT-LCD |
| 6FC5103-0AB02-0AA1 | 15-inch Color CRT | 840D/810D | 15-inch TFT-LCD |
| 6FC5203-0AB02-0AA1 | 15-inch Color CRT | 840D/810D | 15-inch TFT-LCD |
| SM0901 | 9-inch CRT | 810T/820T | 8-inch TFT-LCD |
| SM1200 | 12-inch CRT | 810T/820T | 10.4-inch TFT-LCD |
Installation
- Power off machine and disconnect main power
- Remove CRT (4-6 mounting screws)
- Disconnect signal and power cables
- Install LCD module and connect cables
- Power on — no parameter changes required
Time: 10-15 minutes. Tools: Phillips screwdriver.
Frequently Asked Questions
Will the LCD work with Siemens 840D controls?
Do I need to update Siemens PLC parameters?
How do I identify my Siemens display model?