Multi-brand
CNC Monitor Repair — CRT Replacement & Industrial LCD Repair — Mail-In
Repair for CNC and industrial machine displays: FANUC, Mitsubishi, Haas, Okuma, Fadal, and generic industrial monitors. CRT units can often be converted to drop-in LCD. Free evaluation, typical repairs $350–$750.
Coverage: FANUC / Mitsubishi / Mazak / Okuma / Haas / Fadal displays · 9"–15" CRT & LCD industrial monitors
✓Fixed — or it's free
Unrepairable units are refunded; evaluations cost $0
✓24-month warranty
Every repair covered, parts and labor
✓3–5 business days bench time
Rush (1–2 day) and emergency service available
✓Program preserved
Your application and settings stay in the unit
Symptoms this repair fixes
- ✓Dead display
- ✓Dim, shrunken, or distorted picture
- ✓Flicker and rolling
- ✓Backlight failure on LCD units
Honest limits
- ✕Video faults originating in the control's video board (identified at evaluation)
What you get
- ▸Free evaluation and firm quote
- ▸Board-level repair of power and video stages
- ▸Backlight replacement on LCD units
- ▸CRT-to-LCD conversion option where a proven kit exists
- ▸24-month warranty
Typical units we see
How CNC Monitor & Display units actually fail
Most units we receive fail in one of a handful of well-understood ways. Here is what each fault looks like from the machine, what is happening electronically, and what we do about it at the bench.
Backlight and inverter failure
- What you see
- Dark screen, with a faint image visible if you shine a bright light at it.
- Why it happens
- The backlight and its drive circuitry wear out with running hours while the panel and video path stay perfectly serviceable. On older machine-tool displays this is the single most common fault.
- What we do
- The backlight assembly and its drive circuitry are repaired or replaced and brightness verified across the screen.
Power supply failure
- What you see
- Display completely dead, or one that shuts off after a period of running.
- Why it happens
- Aged capacitors and failed switching components in the display supply, worsened by the heat and vibration of a machine environment.
- What we do
- The supply is repaired at board level, rails verified under load, and the display soak-tested warm.
Video board faults
- What you see
- Distorted image, missing colours, rolling or unstable picture, or no image with the backlight clearly on.
- Why it happens
- Failure on the video processing board, sometimes following a power event at the machine.
- What we do
- The video path is diagnosed and repaired at board level and image quality verified through a warm soak.
Connector and cable damage
- What you see
- Intermittent display, flicker, or an image that changes when the cable is moved.
- Why it happens
- Internal connectors and flex cables fatigue under machine vibration and thermal cycling.
- What we do
- Connectors and internal cabling are inspected and repaired, and stability confirmed under vibration and heat.
A failed display does not mean a failed control. The machine underneath is usually completely healthy — which is why replacing a whole control over a dead monitor is such an expensive mistake, and why a repaired display often returns a machine to production for a fraction of what a retrofit would cost.
What happens on the bench
The same sequence on every 5-stage repair, so nothing gets skipped because a fault looked obvious.
- 1
Intake and fault reproduction
The board or display is logged against your RMA and, where it can be safely powered, the reported fault is reproduced. Machine-tool electronics are frequently reported as "the machine will not run", so the first job is establishing what this specific board is actually doing wrong.
- 2
Power and supply verification
Supply rails are measured under load and checked for ripple. Aged capacitors on a supply produce exactly the intermittent, hard-to-place faults that machine-tool controls are notorious for — random resets, alarms that clear on a power cycle, and displays that fail only when warm.
- 3
Memory and battery-backed data
Where a board carries battery-backed memory we treat its contents as the customer's. Loss of backed-up parameters is a serious event on a machine tool, so batteries and retention circuitry are handled carefully and we flag anything we find at risk rather than discovering it for you later.
- 4
Board-level repair
Failed components are replaced at board level — capacitors, driver circuitry, backlight and inverter assemblies on displays, and connectors, which take mechanical and thermal abuse in machine environments and are a genuine failure point rather than an afterthought.
- 5
Test and thermal soak
Repaired boards and displays are tested and left running warm, because a machine-tool fault that only appears after twenty minutes of operation is worthless to fix if it is only proven for two.
Check these before you ship
Some of these will tell you the unit is fine and the fault is elsewhere. We would rather you find that out now than pay to ship a good unit.
- □Record the full alarm text and number from the control. Machine-tool alarms are specific, and the exact code often identifies the board before it arrives.
- □Note whether the fault is present from cold or only appears once the machine has been running — thermal faults and hard failures are found differently.
- □On a display fault, check for a faint image under a bright light. A visible image means the LCD and video path are alive and the backlight circuit is the fault.
- □If parameters are still readable on the control, record them. Our physical repairs do not erase machine parameters, but a machine tool is not the place to have no record.
- □Check the machine's supply and grounding if boards have failed repeatedly. Recurrent electronics failures on one machine usually have an electrical cause upstream.
Repair or replace?
Machine-tool electronics are the strongest case for repair anywhere in a plant. Control hardware is expensive, frequently long out of production, and tied to a specific machine by its parameters and configuration — replacing a board can mean a retrofit project rather than a swap. Meanwhile the machine is a large fixed asset producing nothing while it waits. Repair keeps the original control intact and the machine in its known-good, proven state.
What to ship
- ▸The monitor only, packed VERY well (glass)
- ▸Machine make/model + symptom
Full packing guidance: mail-in instructions.
Ship your unit to
USPS
Control Board Lab
PO Box 120241
Arlington, TX 76012
UPS / FedEx
Control Board Lab
1009 Oakwood Ln # 120241
Arlington, TX 76012
Write your RMA number on the outside of the box and include it on a note inside. Units over 50 lb (large VFDs, spindle drives, industrial PCs in enclosures) ship by freight — contact us before ordering and we will arrange dock-to-dock shipping.
Frequently asked questions
Should I repair my CRT or convert to LCD?
If a proven LCD conversion exists for your unit we usually recommend it — it eliminates the aging CRT and flyback for good and typically costs no more than another CRT repair. We quote both paths when both exist.
Start with a free evaluation
Ship it in, get a firm quote, approve before any work — pay nothing if it can't be repaired.
The Fixed-or-Free Guarantee: if we can't repair it, you don't pay for the repair.
Call (817) 799-7332 · 📱 Text us a photo of your unit · Email repairs@controlboardlab.com