Fingerprint Sensor Flex Cable
Samsung Galaxy A40 Fingerprint Sensor Flex Cable Replacement
- Fits
- Samsung Galaxy A40
- Fixes
- Faulty fingerprint
- Quality
- Brand new, OEM quality
- Fitting
- Professional install
Overview
What this part is
The Galaxy A40 has its fingerprint sensor on the back of the phone, below the cameras. The sensor connects to the main board with a thin flex cable. A crack, liquid or a torn flex can stop it reading fingers.
Before you order, clean the sensor and try deleting and adding your fingerprint again in Settings › Biometrics and security. If it still fails, this part is the usual repair. After fitting, your fingerprints need to be registered again.
Compatibility
Specifications and compatibility
- Part
- Fingerprint Sensor Flex Cable
- Compatible with
- Samsung Galaxy A40
- Model numbers
- SM-A405F
- Does not fit
- Galaxy A41, Galaxy A50 or any model not listed
- Fixes
- A fingerprint sensor that does not respond, fails to register fingers or is cracked
- Does not fix
- Face recognition problems, software faults or a damaged back cover
- Quality
- Brand new, OEM-quality fingerprint sensor flex cable for the Samsung Galaxy A40. Tested before dispatch.
- Brand
- Unbranded, compatible with Samsung Galaxy A40
- In the box
- 1 × fingerprint sensor with flex cable. Check the photos for any extra items.
- Colour
- Choose from: Black, Red, White
- Installation
- Professional installation recommended
- Supplied by
- Supreme Phone Parts Ltd, Manchester, UK
Before you order
Is this the right part?
Signs it needs replacing
- The phone shows a fingerprint sensor error
- Fingerprints will not register or are not recognised
- The sensor surface is cracked or scratched
- The sensor stopped working after a drop or liquid
How to check your model
Open Settings › About phone. The model name should read Galaxy A40 and the model number should start SM-A405F. It must not be the Galaxy A41 or Galaxy A50.
Compare your old part with the photos before fitting.
Professional installation
How a technician fits this part
- Power the phone off and remove the SIM tray.
- Warm the back cover edges and lift it off carefully with a thin pick.
- Remove the screws and plastic cover plate, then disconnect the battery before anything else.
- Unplug the fingerprint flex from the main board and remove the old sensor from the back.
- Fit the new sensor in the same position and plug its flex in firmly.
- Reconnect the battery, register a fingerprint and test it before closing.
Check that the part matches the device before fitting it or removing any adhesive backing. Once a part has been fitted, it cannot be returned for a change of mind. Faulty parts are always covered.
FAQ
Frequently asked questions
Will this fit my Galaxy A40?
Yes, if Settings › About phone shows Galaxy A40 (model SM-A405F). It does not fit the Galaxy A41 or Galaxy A50.
Does it fit the Galaxy A41?
No. The Galaxy A41 is a different phone and its parts are not the same. Check the model name in Settings › About phone before you order.
Will I need to add my fingerprint again?
Yes. After fitting, open Settings › Biometrics and security and register your fingerprints again.
Is it made by Samsung?
No. It is a brand new, OEM-quality fingerprint sensor flex cable made to fit the Samsung Galaxy A40, and it is tested before dispatch.
Should I fit it myself?
We recommend professional installation. The Galaxy A40 back cover must be removed, and the battery must be disconnected safely.
How quickly will it arrive?
Orders placed before 4pm on a working day are dispatched the same day from Manchester by Royal Mail Tracked. Delivery is free on UK orders over £5. You can also collect from our shop at 33 Moulton Street, Manchester M8 8FQ.
Prepared by the Supreme Phone Parts team, Manchester. Last updated September 2026.