MacBook Air 13″ M4 2025 A3240 Lid Angle Sensor (LAS) Flex Cable

Description

Lid angle sensor (LAS) flex cable for the MacBook Air (13-inch, M4, 2025), model A3240. The sensor cable that tells your MacBook when the lid is opened and closed.

At a glance

Part	Lid angle sensor (LAS) flex cable
Model	A3240 – MacBook Air (13-inch, M4, 2025)
Part numbers	821-05040, 661-50109
Testing	Tested before dispatch
Warranty	12 months
Returns	30 days
Dispatch	Same day on orders before 3pm, Monday to Friday

Compatibility

Model number	MacBook
A3240	MacBook Air (13-inch, M4, 2025)

Your model number starts with “A” and is printed on the bottom case of your MacBook. You can also check Apple menu > About This Mac.

What it fixes

• MacBook will not wake when the lid is opened
• MacBook does not sleep when the lid is closed
• Screen stays off or turns off at certain angles
• Damaged lid angle sensor cable

Quality and testing

• Connectors and cable inspected before dispatch
• Covered by our 12-month warranty

What’s in the box

One lid angle sensor (LAS) flex cable for model A3240.

Important: on Apple silicon MacBooks the lid angle sensor is supplied unprogrammed and normally needs programming to your logic board with a suitable programmer for full lid open/close detection. Contact us before ordering if you are unsure.

Installation

Replaced with the display hinge area exposed. Recommended for experienced technicians.

Fitting service: prefer us to fit it? We can fit this part in our Essex workshop, usually with same-day or next-day turnaround. Contact us for a quote.

Need help choosing?

Send us your model number (and a photo if you can) and we will confirm the right part before you order.

• Email: info@mac-mania.co.uk
• Phone: +44 7782 544675
• WhatsApp: +44 7782 544675

Bulk orders

Buying 10 or more of the same item? Contact us for a bulk discount.

Compatible replacement part. Apple, MacBook, MacBook Air, MacBook Pro, Touch ID and MagSafe are trademarks of Apple Inc. Mac Mania is not affiliated with Apple Inc.