FANUC Series 0i-B maintenance documentation identifies this exact part number as an LCD control printed circuit board within the CNC hardware configuration.

In organic search results, the board is also commonly described as an LCD driver PCB, digital LCD control board, FOI-B PCB, or LCD main display board. These terms are useful for SEO because customers may search for the same board using different product names.

The board supports control and signal communication within the applicable FANUC LCD display assembly. It may be required when the original PCB has confirmed component damage, unstable screen operation, lost display communication, or other diagnosed board-level faults.

Market references associate the A20B-8100-0821 with selected FANUC 0i-A and 0i-B LCD/MDI configurations, but the exact CNC model, display size, board revision, and complete display-unit specification must be confirmed before replacement.

The A20B-8100-0821 is widely listed in the industrial replacement-parts market as a discontinued or legacy FANUC PCB. Tested replacement boards and component-level repair therefore remain useful for maintaining existing CNC display systems.

• LCD control functions tested before shipment
  
• In stock and prepared for prompt dispatch
  
• Worldwide DHL, UPS, and FedEx shipping

Product Details

• Brand: FANUC
• Part Number: A20B-8100-0821
• Alternative Format: A20B81000821
• Official Product Type: LCD Control Printed Circuit Board
• Common Market Names: LCD Driver PCB / FOI-B PCB / LCD Control Board
• Product Series: A20B-8100
• Referenced Control Family: FANUC Series 0i-B
• Additional Market Reference: Selected FANUC 0i-A configurations
• Application: FANUC CNC LCD and LCD/MDI Display Units
• Function: LCD display control and internal signal communication
• Status: Legacy / Widely Listed as Discontinued
• Category: FANUC CNC Display PCB / LCD Control Board

The official product type and Series 0i-B reference above are supported by FANUC maintenance documentation; the FOI-B and additional 0i-A terminology comes from multiple organic replacement-parts listings.

Display Configuration Note

Public listings associate the A20B-8100-0821 with several LCD configurations:

• 8.4-inch LCD
• 9.5-inch LCD
• 10.4-inch LCD
• Monochrome or color display assemblies

However, these details are not described consistently across suppliers. FANUC documentation confirms that it is an LCD control PCB, but the appropriate screen and display-unit configuration must be determined from the original equipment.

Before ordering, please verify:

• Complete FANUC PCB number
• Board revision suffix, such as /01A or /02A
• CNC control model
• LCD or LCD/MDI unit number
• Screen size and display type
• Original connector and component layout
• Whether the fault is in the LCD control PCB, inverter, screen, cable, or power circuit

The inverter is a separate component in FANUC hardware documentation, so the A20B-8100-0821 LCD control board should not automatically be treated as the backlight inverter PCB.

Common Use Cases

• FANUC LCD control PCB replacement
• CNC screen communication troubleshooting
• Repair of intermittent or abnormal display operation
• Replacement of a damaged LCD driver board
• Maintenance of compatible FANUC 0i LCD/MDI units
• Component-level repair of legacy display electronics
• Preparation of a tested spare board for CNC maintenance

Sales & Support

Each A20B-8100-0821 LCD control PCB is inspected and tested under applicable conditions before delivery.

Worldwide shipping is available through DHL, UPS, FedEx, and other express carriers. REACO CNC provides PCB repair service, warranty coverage, testing-video support, and technical assistance for FANUC CNC display boards and LCD/MDI components.