Antenna Signal Flex Cable
Samsung Galaxy A40 Antenna Signal Flex Cable Replacement
- Fits
- Samsung Galaxy A40
- Fixes
- Weak signal
- Quality
- Brand new, OEM quality
- Fitting
- Professional install
Overview
What this part is
The antenna signal cable in the Galaxy A40 is a thin coaxial cable that runs along the side of the phone. It links the main board to the antenna connections on the lower board. If it is pinched, torn or unplugged, for example after a screen or charging port repair, signal can become weak or drop out.
Before you order, check the SIM card in another phone and try a network reset. If signal problems started after a repair or a drop, a damaged antenna cable is a common cause, and this cable is a simple swap once the phone is open.
Compatibility
Specifications and compatibility
- Part
- Antenna Signal Flex Cable
- Compatible with
- Samsung Galaxy A40
- Model numbers
- SM-A405F
- Does not fit
- Galaxy A41, Galaxy A50 or any other model
- Fixes
- Weak, dropping or no signal caused by a damaged or pinched antenna cable
- Does not fix
- A faulty SIM, network outages or main board modem faults
- Quality
- Brand new, OEM-quality antenna signal flex cable for the Samsung Galaxy A40. Tested before dispatch.
- Brand
- Unbranded, compatible with Samsung Galaxy A40
- In the box
- 1 × antenna signal flex cable. Check the photos for any extra items.
- Colour
- As shown in the photos
- Installation
- Professional installation recommended
- Supplied by
- Supreme Phone Parts Ltd, Manchester, UK
Before you order
Is this the right part?
Signs it needs replacing
- Signal bars are low even in good coverage
- Calls drop or data stops working
- Signal problems started after a screen or charging port repair
- The phone shows No service or Emergency calls only
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.
- Unclip the old antenna cable at both ends and lift it out of its routing channel.
- Clip the new cable onto both connectors and press it into the same channel.
- Reconnect the battery and check signal, calls and mobile data 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.
Is this the Wi-Fi antenna?
This is the antenna signal cable that links the main board to the lower antenna connections. Check the photos against the cable in your phone before ordering.
Is it made by Samsung?
No. It is a brand new, OEM-quality antenna signal 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 must be opened with heat, and the small antenna connectors are easy to damage.
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.