Installation
- Power off CNC machine and verify power is off with multimeter
- Remove 4 mounting bolts from the CRT bezel
- Disconnect the 9-pin D-Sub cable
- Connect same cable to the replacement LCD module
- Mount LCD using original screw holes (same pattern)
- Power on — no CNC parameter changes required
Total time: ~15 minutes. The LCD draws DC 12V, matching the original CRT power supply.
Full guide: https://cncdisplay.com/brands/HAAS.html
Technical Details
When replacing a Haas 15-pin VGA CRT, check three things: (1) connector type — 9-pin D-Sub, (2) power supply — DC 12V, (3) control system — Haas Classic Control, VF series, ST series. All three are covered by the standard LCD upgrade. Price: $179.
Image distortion traces to the deflection circuit losing linearity. The horizontal and vertical scan can't maintain proper geometry as components age.
Cost Comparison: Repair vs Replace
| Option | Cost | Lifespan |
|---|---|---|
| CRT repair (rebuilt HV section) | $179–358 each | 3-12 months |
| CRT repair (donor tube swap) | $279–479 | 6-18 months |
| Used CRT on eBay | $358–537 | Unknown (already aged) |
| LCD replacement module | $179 (one-time) | 5-7 years continuous |
Most shops break even on LCD cost within 12 months by eliminating just one CRT failure.
⚠️ Haas uses DC 12V — standard DC 24V modules won't work at correct brightness.
Summary
Haas LCD replacement: same connector (9-pin D-Sub), same power (DC 12V), plug-and-play installation. Full guide: https://cncdisplay.com/brands/HAAS.html
