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| Place of Origin | JAPAN |
| Brand Name | FANUC |
| Certification | CE ROHS |
| Model Number | A20B-3300-0150 |
Part Number: A20B-3300-0150
Manufacturer: FANUC Corporation (Japan)
Product Type: Color Graphics Module — 10.4-Inch LCD
Board Series: A20B-3300
Compatible Systems: FANUC Series 16i, 18i and compatible
Status: Discontinued by Manufacturer
The A20B-3300-0150 is a 10.4-inch color graphics module for FANUC Series 16i and 18i CNC systems. It is the plug-in PCB responsible for driving the 10.4-inch color LCD display panel mounted in the operator panel.
The board plugs directly into the main CPU board of the 16i or 18i controller and generates the video signal that the LCD panel displays.
The 10.4-inch display was the standard screen size for FANUC's i-series CNC at the time these controllers were produced.
It gave operators a clear, full-color view of the CNC screen — axis positions, active programs, parameter screens, alarm messages, tool path graphics, and all other interface functions. Everything the operator sees on the display travels through the A20B-3300-0150 before it appears on the screen.
This board is discontinued by FANUC.
It remains an active maintenance item because the machines it served — Series 16i and 18i machining centres, turning centres, and compound machines — continue to operate in production worldwide.
When this board fails, the display goes blank. The CNC continues operating normally internally, but the operator loses all visual feedback.
| Parameter | Value |
|---|---|
| Part Number | A20B-3300-0150 |
| Manufacturer | FANUC Corporation |
| Product Type | Color Graphics Module |
| Board Series | A20B-3300 |
| Display Size | 10.4 inches |
| Display Type | Color LCD |
| Resolution | 640 × 480 (VGA) |
| Input Voltage | 5 V DC |
| Weight | 0.44 kg |
| Compatible Systems | FANUC Series 16i / 18i and compatible |
| Installation | Plug-in to main CPU board |
| Operating Temperature | 0 – 50°C |
| Production Status | Discontinued by Manufacturer |
| Origin | Japan |
| Condition Available | New (surplus) / Refurbished / Repaired |
640×480 is VGA resolution — 307,200 pixels arranged in a 4:3 aspect ratio. On a 10.4-inch screen, this gives approximately 77 pixels per inch. That is sufficient for crisp text rendering, readable parameter screens, clear alarm messages, and useful tool path graphic displays.
Color is handled fully.
The A20B-3300-0150 drives a color LCD, not a monochrome one. FANUC's i-series displays use color to distinguish screen elements — different colors for different data fields, status indicators, alarm highlighting.
This visual coding makes the interface more readable and helps operators identify abnormal states quickly.
A monochrome substitute would display the content but without the color coding that makes the interface most legible.
The board generates the video signal in the correct format for the 10.4-inch color LCD panel.
The panel and the board are matched — a replacement board must be the correct part number for the panel type installed. Boards for different display sizes or different panel specifications are not interchangeable.
The A20B-3300-0150 mounts on the main CPU board of the Series 16i or 18i controller. It occupies the graphics card slot — a dedicated socket on the main board designed for this module. The connection provides the board with system power (5V DC) and the video data from the CNC's display processor.
This mounting approach integrates the graphics function into the main controller assembly without requiring separate cabling between a graphics processor card and the display. The video output goes directly from the A20B-3300-0150 to the LCD panel through the panel's video input connector.
When replacing the board, confirm the replacement module is fully seated in its socket.
A partially seated graphics module typically produces a blank display rather than a distorted one — partial seating breaks the video signal path completely.
After replacement, power the system on and confirm the display shows the FANUC boot screen before considering the repair complete.
The 16i and 18i were FANUC's workhorses for the early 2000s CNC generation.
They drove machining centres and turning centres of every description — small VMCs, large horizontal machining centres, multi-axis turning centres, compound machines.
The 10.4-inch color display was the standard configuration across this range.
Machines built on these controllers are now well into their second or third decade of service.
The mechanical components — spindles, guideways, ballscrews — often have remaining life. The electronics are maintained rather than replaced. The A20B-3300-0150 is one of the boards that keeps these machines operational.
Because the board is discontinued, available supply comes from original surplus stock or refurbished units.
Testing before sale is important for display modules — a module with marginal circuits may show correct boot behavior but fail under specific display conditions.
Sourcing from suppliers who test under load provides better assurance than untested surplus.
Q1: The 10.4-inch LCD display is blank on power-up. The CNC appears to operate normally otherwise. Is the A20B-3300-0150 the cause?
A blank display with normal CNC operation is consistent with a graphics module fault. Before concluding the board has failed, check the LCD panel's power connection and the video signal cable between the panel and the board.
A disconnected video cable produces a blank display independently of the graphics board condition.
If power and cabling are confirmed good and the display remains blank, the graphics module is the primary suspect.
Q2: The display shows the screen but colors are incorrect — some areas show wrong colors or flickering color. Is this the board?
Color display faults — wrong colors, color flickering, partial color loss — are more commonly caused by a failing LCD panel or a damaged video cable than a failing graphics board. The graphics module generates a correct signal; the panel renders it.
Damage to the panel's color filter layer or the LCD driver circuitry produces color abnormalities.
Test with a known-good replacement panel before replacing the graphics board.
Q3: Can the A20B-3300-0150 drive a different size LCD panel — for example, a 7.2-inch or 8.4-inch unit?
No. The A20B-3300-0150 is specifically for 10.4-inch color LCD configurations.
The video signal timing, resolution, and drive characteristics are matched to the 10.4-inch panel. Different display sizes use different graphics modules.
Installing the -0150 in a system configured for a different display size will not produce correct output.
Q4: After replacing the graphics board, the display shows garbled text at boot and then goes blank. What happened?
Garbled text during boot that resolves to a blank screen suggests the board is partially functional but failing before the display stabilizes.
This can indicate a partially failed replacement board or an intermittent power supply voltage at the board's 5V input.
Measure the 5V supply at the main board socket with a voltmeter. Voltage below 4.75V or voltage with significant ripple can prevent the graphics module from operating reliably.
Q5: Is a parameter change or software update required after installing the A20B-3300-0150?
No software reconfiguration is typically required. The graphics module provides a hardware function — video output for the display — that the CNC software uses without needing to know which specific board revision is installed.
Power on the system after installation and confirm normal display operation.
If the CNC parameters include display-type settings, verify they are set correctly for a 10.4-inch color LCD, but this would be an existing parameter setting rather than a new one required by the board replacement.
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