The FANUC A20B-8002-0632 is an LCD inverter PCB for a 10.4-inch color display in selected FANUC Series 0i-C and 0i Mate-C CNC basic units. Often described as an LCD high-voltage or backlight board, it supplies the electrical drive required by the display backlight.

FANUC documentation associates this inverter with specific A02B-0309-B52n, A02B-0311-B52n and A02B-0311-B53n basic-unit families. Confirm the complete CNC unit number and the original inverter label before ordering because other 10.4-inch units can use a different board.

A20B-8002-0632 Product Information

LCD Backlight Inverter Function

The inverter converts the display unit's incoming supply into the controlled high-voltage output required by the LCD backlight. A failed board can be associated with a dark screen, intermittent illumination, flickering or a display image that remains faintly visible without normal backlighting. The LCD panel, backlight lamp, cable and power source should also be checked before attributing the fault to the inverter.

Compatibility and Replacement Checks

Match A20B-8002-0632, the PCB revision, connector layout and mounting points with the removed board. Also verify the complete A02B basic-unit number and 10.4-inch color LCD configuration. A20B-8001-0920 is documented for other 10.4-inch basic-unit versions and should not be treated as an automatic plug-in substitute.

Testing and Installation Notes

REACO CNC checks the model label, PCB condition, connectors, power conversion and stable backlight output under an applicable test setup. The inverter produces hazardous high voltage during operation. Disconnect CNC power and allow the circuit to discharge before handling; installation should be completed by qualified personnel using proper ESD precautions.

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