Which motherboard fits the Lenovo IdeaPad Flex 5 14ALC05? OEM part numbers

6 motherboards are documented for the Lenovo IdeaPad Flex 5 14ALC05: 5B21B84829, 5B21B84830, 5B21B84832, 5B21B84990, 5B21B84991 and 1 more. 6 of 6 come from OEM documentation (pcsupport.lenovo.com); last checked 2026-11-04. Not bench-tested: match the number on your old motherboard and any constraint before ordering.

Part number	Part	Constraints	Confidence	Last checked
5B21B84829	Lenovo Lenovo BDPLANAR MB WIN W 82HU R35300U_UMA_4G 5B21B84829	Lenovo description: "Lenovo BDPLANAR MB WIN W 82HU R35300U_UMA_4G". OEM documentation only; not bench-tested.	OEM documented	2026-11-04
5B21B84830	Lenovo Lenovo BDPLANAR MB WIN W 82HU R35300U_UMA_8G 5B21B84830	Lenovo description: "Lenovo BDPLANAR MB WIN W 82HU R35300U_UMA_8G". OEM documentation only; not bench-tested.	OEM documented	2026-11-04
5B21B84832	Lenovo Lenovo BDPLANAR MB WIN W 82HU R55500U_UMA_8G 5B21B84832	Lenovo description: "Lenovo BDPLANAR MB WIN W 82HU R55500U_UMA_8G". OEM documentation only; not bench-tested.	OEM documented	2026-11-04
5B21B84990	Lenovo Lenovo BDPLANAR MB WIN W 82HU R55500U_UMA_16G 5B21B84990	Lenovo description: "Lenovo BDPLANAR MB WIN W 82HU R55500U_UMA_16G". OEM documentation only; not bench-tested.	OEM documented	2026-11-04
5B21B84991	Lenovo Lenovo BDPLANAR MB WIN W 82HU R75700U_UMA_8G 5B21B84991	Lenovo description: "Lenovo BDPLANAR MB WIN W 82HU R75700U_UMA_8G". OEM documentation only; not bench-tested.	OEM documented	2026-11-04
5B21B84992	Lenovo Lenovo BDPLANAR MB WIN W 82HU R75700U_UMA_16G 5B21B84992	Lenovo description: "Lenovo BDPLANAR MB WIN W 82HU R75700U_UMA_16G". OEM documentation only; not bench-tested.	OEM documented	2026-11-04

Where do these Lenovo IdeaPad Flex 5 14ALC05 motherboard part numbers come from?

6 of 6 fits are from OEM documentation (pcsupport.lenovo.com); each row links its source. Last checked 2026-11-04.

Are these motherboards tested in the Lenovo IdeaPad Flex 5 14ALC05?

No. Fits come from manufacturer or retailer documentation and are not bench-tested. Check the part number on your old part and any listed constraint.

All documented parts for the IdeaPad Flex 5 14ALC05.

Other parts for the IdeaPad Flex 5 14ALC05

Keyboard (378) · Service Part (224) · Heat Sink (2) · Screw Kit (1) · Power Adapter (32) · Screen (5) · Power Cord (38) · Wireless Card (4) · Stylus (4) · SSD (11) · Cable (4) · Display Cable (1) · Touchpad (3) · Hinge (3) · Fan (1) · I/O Board (1) · Battery (4) · Display Back Cover (3) · Bracket (2) · Camera (1) · Speakers (1)

For AI agents: the same list as JSON from the free MCP server at /mcp (tool get_model_parts, model lenovo-ideapad-flex-5-14alc05) or the keyless JSON API.