The FANUC A20B-8002-0130 is an inverter PCB for a 9.5-inch monochrome LCD. Often described as an LCD high-voltage or backlight board, it converts the incoming supply into the output required to illuminate the monochrome LCD backlight.

FANUC documentation lists this board for Series 15i/150i-A monochrome displays and as the replacement specification for older A20B-2002-0480 and A20B-8001-0910 inverter boards. The complete display-unit model and connector layout must still be checked.

A20B-8002-0130 Product Information

Monochrome LCD Backlight Function

The inverter supplies controlled high-voltage power to the LCD backlight. A faulty board can cause a dark screen, intermittent illumination or flickering while display data remains present. The backlight lamp, LCD panel, cables and incoming supply should also be checked before diagnosing the inverter.

Compatibility and Replacement Checks

Match the full A20B-8002-0130 number, PCB revision, connectors and mounting points. Also verify the A02B display-unit model and 9.5-inch monochrome LCD configuration. When replacing an older A20B-2002-0480 or A20B-8001-0910 board, confirm the installation arrangement in the FANUC or machine-builder documentation.

Testing and Installation Notes

REACO CNC checks the label, PCB condition, connectors, power conversion and stable backlight output under an applicable test setup. The inverter generates hazardous high voltage during operation. Isolate CNC power and allow the circuit to discharge before handling. Qualified personnel should perform installation using ESD protection.

Related resources: FANUC PCB boards, FANUC CNC controls and FANUC CNC repair services.